Author Archive
16
Aug
(Beyond Pesticides, August 16, 2007) The Environmental Protection Agency’s (EPA) recent decision not to go through with a Special Review of 2,4-D’s carcinogenic properties is being touted by industry as the final word that the toxic chemical “has been found to have no human carcinogenic effects,” despite significant evidence to the contrary. The Special Review has been cancelled after an industry task force poured millions of dollars into industry funded research and a public relations campaign. The pesticide 2,4-D, or 2,4-Dichlorophenoxyacetic acid, was first slated by EPA for Special Review in 1986. A few years later in a unique move, several large pesticides companies with a common interest in keeping 2,4-D on the market formed the Industry Task Force II on 2,4-D Research Data. Since then, the task force reports it has funded nearly $30 million in new research on the chemical. Industry funded research is often biased and influential in the regulatory process. The results are reported to EPA, which provides a large portion of the data the agency relies on in order to make decisions under an inadequate risk assessment review process. The task force is currently comprised of the major pesticide producers Dow AgroSciences (U.S.), Nufarm Ltd. […]
Posted in 2,4-D, Corporations, Dow Chemical, Pesticide Regulation | No Comments »
15
Aug
(Beyond Pesticides, August 15, 2007) As the popularity and demand for organic food has and continues to increase, so too is the popularity of organic lawn care, as an increasing number of people are seeking out alternatives to conventional lawn chemicals. Organic products are making inroads into the $35 billion lawn- and garden-care industry, which for years has been focusing on chemically-intensive methods. The growing demand for organic land care is coming from all sectors: homeowners, municipal park managers, and business professionals alike. A 2005 survey of 2,000 adults by the Natural Marketing Institute found 20 percent of consumers had bought some kind of environmentally friendly lawn-and-garden product. According to CNN, market researchers Freedonia Group estimate a 10 percent annual growth for the organic fertilizer market, twice the projected growth for all lawn and garden goods. Taking the organic route may be more work and pricier initially, but the payoff will be a yard that costs less in the long-term to care for, is safer for the environment and handles stresses such as drought. Additionally, as more people switch to organic lawn care, the costs will keep coming down, and the techniques will be further refined. With more pesticides and […]
Posted in Lawns/Landscapes | 1 Comment »
14
Aug
(Beyond Pesticides, August 14, 2007) In an August 8, 2007 Federal Register Notice (72 FR 44510-44511), the Environmental Protection Agency (EPA) announced its decision to not initiate a Special Review for the commonly used herbicide 2,4-D, as well as the related herbicides 2,4-DB and 2,4-DP (dichlorprop). Despite evidence to the contrary, according to the FR notice, “Based on extensive scientific review of many epidemiology and animal studies, EPA find that the weight of the evidence does not support a conclusion that 2,4-D, 2,4-DB and 2,4-DP are likely human carcinogens.” Although a mounting body of evidence links 2,4-D to various cancers, particularly non-Hodgkin’s lymphoma, EPA has been reluctant to classify it as a carcinogen in the face of industry pressure. EPA lists the herbicide in class D for carcinogenicity. Chemicals in this class are considered to have inadequate evidence for carcinogenicity, or not enough data is available. However, the link between 2,4-D and non-Hodgkin’s lymphoma has been demonstrated in the United States, Italy, Canada, Denmark, and Sweden. A 1986 National Cancer Institute (NCI) study found that farmers in Kansas exposed to 2,4-D for 20 or more days per year had a six-fold higher risk of developing non-Hodgkin’s lymphoma than non-farmers. The […]
Posted in 2,4-D, Disease/Health Effects, Pesticide Regulation | 2 Comments »
13
Aug
(Beyond Pesticides, August 13, 2007) Greenland sharks, which inhabit some of the least populated regions on Earth in seemingly pristine Arctic waters, contain high amounts of human-manufactured industrial waste in their bodies, including toxic pesticide byproducts. The findings are available online in Marine Pollution Bulletin (in press), entitled “Dioxins and PCBs in Greenland shark (Somniosus microcephalus) from the North-East Atlantic.” According to the team of researchers at Stockholm University, the highest measured concentration found is for the world’s most toxic dioxin, TCDD, a compound found in the herbicide Agent Orange, which the U.S. military used during the Vietnam War. The herbicide was used for other applications from 1961 to 1971. The study also names another set of discontinued chemicals, polychlorinated biphenyls, or PCBs, as the main source of the contaminants found in the Greenland sharks. PCBs were banned in the 1970s, which illustrates how persistent such compounds are in the environment and how long-living, top predator species may carry them for decades. Project leader Dr. Ă…ke Bergman, Ph.D., an environmental chemist at Stockholm University, told Discovery News that he and his team decided to focus on Greenland sharks since their normal lifespan may exceed 100 years, based on an annual […]
Posted in International, Wildlife/Endangered Sp. | No Comments »
10
Aug
(Beyond Pesticides, August 10, 2007) As the face of agriculture in America changes with rising prevalence of herbicide-tolerant crops, farmers in Mississippi and Arkansas are also facing challenges caused by increased herbicide resistance. A recent press release by the Delta Research and Extension Center (DREC) blames glyphosate-resistant weeds for increased costs in Mississippi, while a leading British researcher will work with the University of Arkansas Cooperative Extension Service to determine the impact that the same weeds will have on farming in Arkansas. According to DREC’s release, a “concern for agricultural production in the Mississippi Delta is the increase of weeds resistant to the herbicide glyphosate . . . DREC rice weed scientist Jason Bond said that both glyphosate-resistant horseweed and volunteer Roundup Ready soybeans have become problem weeds for Mississippi rice production.” Research associate Tom Eubank also said, “Glyphosate-resistant horseweed, ryegrass and pigweed are concerns in Mississippi Delta soybeans.” Meanwhile, Arkansas farmers are noticing a similar trend: the increased use of glyphosate on Monsanto’s “Roundup Ready” crops is leading them to map the future of herbicide-resistant weeds and consider alternative weed management programs. According to the High Plains/Midwest Agricultural Journal, “researchers believe that if pigweed, or Plamer amaranth, can’t be […]
Posted in Arkansas, Glyphosate, Mississippi | No Comments »
09
Aug
(Beyond Pesticides, August 9, 2007) China reports it is cracking down on the use of recently banned pesticides and is taking additional actions in an effort to counter concerns about the country’s food safety. The major exporter has been the subject of frequent reports of contaminated products, including several foods imported by the U.S. Reuters reports that according to a new poll, U.S. consumers are extremely wary of products made in China, and nearly two-thirds said they would support a boycott of Chinese goods. In reaction to the potential loss of export markets and the upcoming Beijing Olympics, China says it will spend more than $1 billion improving food and drug safety over the next three years. The Chinese government will specifically launch a campaign to crack down on the use of banned pesticides that are still being manufactured and remain in use. The campaign is in response to news reports that “a dozen or so” pesticide producers were still making highly poisonous pesticides such as methylamine and phosphamidon. Prior to the recent ban, 1,500 pesticide manufacturers, approximately half of the industry, produced the chemicals. However, pesticides that are still approved for use in China are also raising concerns as […]
Posted in International, Pesticide Regulation | No Comments »
08
Aug
(Beyond Pesticides, August 8, 2007) For the first time, the World Health Organization (WHO) released a report in July on children’s heightened vulnerability to chemical exposures at different periods of their growth and development. The organization cites over 30% of the global burden of disease in children can be attributed to environmental factors, including pesticides. The report, Principles for Evaluating Health Risks in Children Associated with Exposure to Chemicals, is a new volume of the WHO’s Environmental Health Criteria series. It highlights the fact that for children, the stage of their development when chemical exposure occurs may be just as important as the magnitude of the exposure. In respect to pesticides, the report cites several studies that tie pesticide exposure during key periods of development to neurobehavioral problems, Parkinson’s disease, and immunotoxicity, including respiratory diseases. “Children are not just small adults,” said Dr. Terri Damstra, Ph.D., WHO’s team leader for the Interregional Research Unit, in WHO’s press release. “Children are especially vulnerable and respond differently from adults when exposed to environmental factors, and this response may differ according to the different periods of development they are going through.” Air and water contaminants, pesticides in food, lead in soil, as well […]
Posted in Children/Schools, Disease/Health Effects, International | 1 Comment »
07
Aug
(Beyond Pesticides, August 7, 2007) In a study that examines the influence of age of exposure on the magnitude of the association between DDT and breast cancer risk finds that women who were exposed to DDT before the age of 14 are five times more likely to develop breast cancer later in life. In contrast, the study finds exposure after adolescence does not increase risk. The data used in the study targets the age of a woman in 1945 as an indicator for the youngest possible age for a woman to be exposed to DDT, since DDT was first introduced to the U.S. for mosquito control in 1945. The researchers, from the Center for Research on Women’s and Children’s Health, Public Health Institute at Berkeley, California and the Mount Sinai School of Medicine, analyzed blood that had been collected from women between 1959 and 1967 – years during which the use of DDT was at its highest. “DDT and breast cancer in young women: New data on the significance of age at exposure,” published last week in the online edition of the journal Environmental Health Perspectives, is “the first study specifically designed, a priori, to consider whether age at exposure […]
Posted in Breast Cancer, Children/Schools, DDT | 1 Comment »
06
Aug
(Beyond Pesticides, August 6, 2007) On July 20, 2007 the U.S. House of Representatives passed the Farm, Nutrition and Energy Act of 2007 (H.R. 2419), commonly known as the Farm Bill, on a vote of 231-191, with 10 Representatives not voting. The vote fell generally along party lines with 19 Republicans (just six from the Agriculture Committee) voting for the bill, despite opposition from Republican leadership, the threat of a Presidential veto, and 14 Democrats voting against it. Organic and sustainable agriculture groups are giving the 2007 Farm Bill a mixed review. While taking several steps forward by increasing funding for programs that support the next generation of farmers and new marketing options for organic, sustainable producers, the bill as a whole moves in reverse with substantial weakening of current commodity and conservation payment limitations and a 30 percent funding cut for the Conservation Security Program. The National Organic Coalition (NOC), which includes the Rural Advancement Fund International, Center for Food Safety, Beyond Pesticides and others, developed a list of priorities for the Farm Bill. View a full analysis of the NOC requests adopted and rejected by the House Agriculture Committee. The Sustainable Agriculture Coalition reports that the Farm Bill […]
Posted in Alternatives/Organics, National Politics | No Comments »
03
Aug
(Beyond Pesticides, August 3, 2007) Maine is no longer the only state to prohibit the use of genetically altered corn. Despite concern from the organic farming community, Maine joined the rest of the nation last Friday when the Board of Pesticide Control (BPC) ruled to allow Bacillus thuringiensis (Bt) corn to be grown and sold in the state of Maine. With the aim of reducing the use of hazardous pesticides, the BPC registered Bt corn products from Dow AgroSciences, Pioneer Hi-Bred International and Monsanto to be grown for animal feed. Bt corn is genetically modified to produce its own pesticide, a naturally occurring toxin that protects against a combination of insects. Organic growers caution that overuse of the crop will lead to insect resistance to the Bt toxin, which is widely sprayed on organic crops. “I think it might very well be a short-term solution and farmers will be forced to use more pesticides in the future,” said Board member Lee Humphreys, a market gardener. She warned that there are too many unknowns about the genetically modified corn, such as its long-term effect on the soil and in creating resistant bugs. In addition, the safety of consuming milk and beef […]
Posted in Alternatives/Organics, Bt, Genetic Engineering, Maine | 2 Comments »
02
Aug
(Beyond Pesticides, August 2, 2007) According to the Associated Press (AP), a new study finds frogs in Vermont living near farms are more than twice as likely as those living elsewhere to have deformities like missing legs. Yale University ecologist David Skelly, Ph.D., told the AP he decided to look at Vermont frogs because the state has been a hot spot during the last 10 years for deformed frogs. “We went to all these wetlands and cataloged where the deformities were found, and what kind of landscapes seemed to pose higher risks, if any,” Dr. Skelly said. “The answer was, frogs growing up in proximity to agriculture were more than two times as likely to have deformities. This doesn’t say it is chemical pesticides, but you can’t credibly consider this problem of the frogs without at least evaluating whether pesticides are involved.” Richard Levey, a biologist with the Vermont Agency of Natural Resources, said two common farm chemicals, atrazine and metolachlor, had been found in trace amounts in water from wetlands where deformed frogs had been found. But he told the AP that the concentrations were far below those thought to have any effect on aquatic life. Research by Tyrone […]
Posted in Atrazine, Vermont, Wildlife/Endangered Sp. | 3 Comments »
01
Aug
(Beyond Pesticides, August 1, 2007) Farm workers and advocate groups, including Beyond Pesticides, filed a lawsuit yesterday against the Environmental Protection Agency (EPA) to stop the continued use of a deadly pesticide called chlorpyrifos. Chlorpyrifos is a highly neurotoxic insecticide developed from World War II-era nerve gas. Exposure can cause dizziness, vomiting, convulsions, numbness in the limbs, loss of intellectual functioning and death. “This pesticide puts thousands of workers at risk of serious illness every year,” said Erik Nicholson of the United Farm Workers. “It is inexcusable for the EPA to allow the use a pesticide they know to be damaging to people, especially children.” Luis Medellin, a Lindsay, California resident, suffered first hand exposure to chlorpyrifos. “I got sick, and my mother and younger sisters started throwing up, all this in our own home. It was a terrible feeling, the smell coming in through our air conditioner,” he said. “The government must not allow this dangerous chemical to be sprayed around our schools and communities.” Chlorpyrifos is used widely on corn, orchard, and vegetable row crops all over the country. Also know as Lorsban, it is responsible for a substantial number of worker poisonings each year and has been […]
Posted in California, Chlorpyrifos, Litigation, Pesticide Regulation | No Comments »
31
Jul
(Beyond Pesticides, July 31, 2007) Preliminary research into birth records and pesticide data reveal that mothers who were within 500 meters of fields sprayed with organochlorine pesticides during their first trimester of pregnancy were six times higher to have children with autism compared to mothers who did not live near the fields. Scientists from the California Department of Public Health conducted the study, which is available online in Environmental Health and Perspectives, entitled, “Maternal Residence Near Agricultural Pesticide Applications and Autism Spectrum Disorders Among Children in the California Central Valley.” The study, initiated to “systemically explore the general hypothesis that residential proximity to agricultural pesticide applications during pregnancy could be associated with autism spectrum disorders in offspring,” found that 28% of the mothers studied who lived near fields in Central Valley, which were sprayed with organochlorines, such as endosulfan and dicofol, have children with autism. However, officials are quick to point out that their findings are preliminary. “We want to emphasize that this is exploratory research,” says Dr. Mark Horton, M.D., director of the California Department of Health. “We have found very preliminary data that there may be an association. We are in no way concluding that there is a […]
Posted in Autism, California, Children/Schools, Disease/Health Effects, Endosulfan | 2 Comments »
30
Jul
(Beyond Pesticides, July 30, 2007) Following the release of a new national report, Ending Toxic Dependency: The State of IPM, environmental and health groups in New York state issued a letter to Governor Eliot Spitzer. In the letter, they requested that the Governor order all state agencies to phase out use of toxic pesticides in favor of less- and non-toxic products. Twenty-six groups signed the statement, which urges Mr. Spitzer to reduce the amount of pesticides used in the state, which, in 2004, included 2.7 million gallons applied by pest-control companies alone. “We should not be exposing state workers and the public to hazardous and unnecessary chemicals that can cause a range of serious health problems, from asthma attacks to birth defects and cancer, as well as contaminate our air and drinking water,” said Laura Haight of the New York Public Interest Research Group, one of the co-signing organizations. “It’s not rocket science; there are towns and counties and cities across the state doing just this on their own property.” The body of the letter, expanding Ms. Haight’s statement, reads: Our groups, which represent citizens from across the state, applaud you for your commitment to protecting the environment and public […]
Posted in New York, Pesticide Regulation | No Comments »
27
Jul
(Beyond Pesticides, July 27, 2007) A new study, published in the British Journal of Nutrition, shows that organic dairy and meat products in a mother’s diet improve the nutritional quality of her breast milk – markedly increasing beneficial fatty acids. Specifically, a diet in which 90% or more of dairy and meat products are organic is correlated with measurably higher levels of conjugated linoleic acid (CLA) than in a moderately organic diet or a conventional diet. CLA is a type of fat that is believed to have anti-carcinogenic, atherosclerotic (i.e. ability to prevent hardening of arteries), anti-diabetic and immune-enhancing effects, as well as a favorable influence on body fat composition. For newborns specifically, CLA is believed to especially aid immune system development. “These findings provide scientific support for common sense, by showing that organic foods are healthier,” says Dr. Lukas Rist, Ph.D., who is the lead author of the study and the head of research at the Paracelsus Hospital in Switzerland. The study, “Influence of organic diet on the amount of conjugated linoleic acids in breast milk of lactating women in the Netherlands,” involved 312 breastfeeding women with 1-month old infants from the Netherlands and compared mothers on a strict […]
Posted in Alternatives/Organics, Children/Schools, Disease/Health Effects | No Comments »
26
Jul
(Beyond Pesticides, July 26, 2007) A company with previous pesticide violations will likely face a significant fine after accidentally spraying children at a day care in Virginia last week with herbicides. Several children were directly sprayed and at least three experienced symptoms of acute pesticide poisoning. The company, NaturChem, was hired by Norfolk Southern to spray a section of railroad tracks, which they do every three years to suppress unwanted plants along the tracks. Sixteen children were playing outside at the day care, adjacent to the tracks as the NaturChem tanker went by. Four children, who were playing along the fence, were directly sprayed. While day care staff took them inside, washed them and changed their clothes immediately, at least three children had acute symptoms following their exposure, including a bloody nose, diarrhea, eye irritation, and blistering. The chemicals’ labels prohibit application methods that result in drift to other property or people, according to the Virginia Department of Agriculture, and it is illegal to use pesticides in a manner inconsistent with their labeling. This is NaturChem’s second violation in Virginia, following a $2,000 fine in 2005 for causing property damage in Giles County. The company also reached a $194,200 settlement […]
Posted in Children/Schools, Glyphosate, Imazapyr, Triclopyr, Virginia | 8 Comments »
25
Jul
State laws regulating pest management allow broad dependency on toxic pesticides, while four states call for pesticide reduction and alternatives Washington, DC, July 25, 2007 – With increasing public concern about the use of toxic and polluting pesticides because of adverse impacts on people and the environment, a national study finds that states are lagging behind on “green” standards for managing their state lands and buildings. The report, Ending Toxic Dependency: The State of IPM, to be published in the Summer issue of Pesticides and You, finds that statewide integrated pest management (IPM) laws do not exist in 40 states and the District of Columbia, and existing laws in only 10 states are limited and mostly inadequate. Only four states call for pesticide reduction and alternatives that do not rely on toxic chemicals in their IPM law. Six of the 10 states adopt the definition most promoted by the chemical and pest control industry — a combination of methods without priority being given to non-chemical practices and absent toxic reduction or elimination goals and least-toxic chemicals. “While people are increasingly concerned about pollution, global warming, and fossil fuel use, state legislatures have a responsibility to ensure that pest management practices […]
Posted in Alternatives/Organics, State/Local | 2 Comments »
24
Jul
Update: See Organic Agriculture and Food Security in Africa, United Nations Conference on Trade and Development (UNCTAD), United Nations Environment Programme (UNEP), 2008.  The report notes that not only can organic agriculture feed the world but it may be the only way we can solve the growing problem of hunger in developing countries. UNEP and UNCTAD state that its extensive study “challenges the popular myth that organic agriculture cannot increase agricultural productivity.” In an analysis of 114 farming projects in 24 African countries, UNEP reports that organic or near-organic practices result in a yield increase of more than 100 percent. (Beyond Pesticides, July 24, 2007) After a three-year study of worldwide organic versus conventional farm yields, researchers have found that organic farming can produce as much as, and even exceed the crop and animal yields of conventional farming. These findings dispute the myth that organic methods are less productive. University of Michigan’s School of Natural Resources and Environment professor Ivette Perfecto, Ph.D., and Catherine Badgley, Ph.D., research scientist with the University’s Museum of Paleontology, conducted the study. Their findings are derived from a database of information from farms in both developed and developing nations. The full study, “Organic agriculture and the […]
Posted in Alternatives/Organics, International | 1 Comment »
23
Jul
(Beyond Pesticides, July 23, 2007) New research finds several species of freshwater fish have lower temperature tolerances when exposed to the widely used pesticides endosulfan and chlorpyrifos. The discovery reveals another key pesticides issue in the global warming debate. The study, “The Effects of Three Organic Chemicals on the Upper Thermal Tolerances of Four Freshwater Fishes” (Environmental Toxicology and Chemistry, July 2007), is the work of Ronald Patra of Australia’s Department of Environment and Conservation and colleagues. The study establishes the upper temperature tolerances of both unexposed and exposed silver perch, eastern rainbowfish, western carp gudgeon and rainbow trout. Exposed fish were given sublethal doses of endosulfan, chlorpyrifos or phenol. The results show exposure to endosulfan cause a decrease of temperature tolerance in silver perch by 2.8 °C, eastern rainbowfish 4.1 °C, western carp gudgeon 3.1 °C, and rainbow trout 4.8 °C. Chlorpyrifos decreases temperature tolerance in silver perch by 3.8 °C, eastern rainbowfish 2.5 °C, western carp gudgeon 4.3 °C, and rainbow trout 5.9 °C. Phenol is not shown to cause a significant decrease in tolerance. The authors conclude, “The reduction in thermal tolerance of fish in the presence of endosulfan and chlorpyrifos suggest that, not only does temperature […]
Posted in Chlorpyrifos, Climate Change, Endosulfan, Wildlife/Endangered Sp. | No Comments »
20
Jul
(Beyond Pesticides, July 20, 2007) Dow Chemical Company has reached agreement with the Environmental Protection Agency (EPA) to begin cleanup of dioxin contamination downstream of its Midland, Michigan facility immediately. The teratogenic (i.e. ability to cause developmental malformations) and mutagenic compounds are not only byproducts of manufacturing processes but are contained in one of Dow’s most used herbicides. Last November, Dow identified dioxin hot spots along the Tittabawassee River, but corrective action “has taken too long” according to an EPA press release. “EPA has documented that dioxin contamination in soil poses risks to human health and the environment.” Dioxins are a family of chemicals that have been linked to cancer, weakened immune systems and reproductive problems. Terry Miller, a member of Lone Tree Council, an environmental group, told the Saginaw News that EPA’s decision confirmed his suspicions that Dow was “dragging their feet” in the cleanup efforts. “There’s been a lot of print suggesting the state has been too hard on the company when it appeared that Dow was being too slow,” he said. “The federal government would seem to support that contention.” Michelle Hurd-Riddick, a spokeswoman for the Lone Tree Council, was quoted by the Saginaw News saying that […]
Posted in Dow Chemical, Michigan, Pesticide Regulation | 1 Comment »
19
Jul
(Beyond Pesticides, July 19, 2007) In response to the recent declining bee colony crisis, U.S. Department of Agriculture Under Secretary for Research, Education and Economics Gale Buchanan announced on July 13, 2007 that USDA researchers have finalized an action plan for dealing with colony collapse disorder (CCD) of honey bees, which includes pesticides as a reason for the problem. “There were enough honey bees to provide pollination for U.S. agriculture this year, but beekeepers could face a serious problem next year and beyond,” Buchanan said. “This action plan provides a coordinated framework to ensure that all of the research that needs to be done is covered in order to get to the bottom of the CCD problem.” The action plan coordinates the federal strategy in response to CCD. It addresses four main components: (1) survey and data collection needs; (2) analysis of samples to determine the prevalence of various pests and pathogens, exposure to pesticides, or other unusual factors; (3) controlled experiments to carefully analyze the potential causes of CCD; and (4) developing new methods to improve the general health of bees to reduce their susceptibility to CCD and other disorders. Four possible causes for CCD are identified in the […]
Posted in Imidacloprid, Pollinators | No Comments »
18
Jul
(Beyond Pesticides, July 18, 2007) Since 2000, the United States has financed aerial spraying of glyphosate over Colombia’s coca crops, the raw material of cocaine, as part of the “War on Drugs.” Scientists from Pontificia Catholic University in Quito, Ecuador, have completed a study of 24 residents living within three kilometers of the Colombian border — an area targeted by the coca spraying – and have found a wide variety of ailments. The study’s subjects suffer from symptoms that include intestinal pain, diarrhea, vomiting, headaches, dizziness, numbness, blurred vision, skin irritation, rashes, and difficulty breathing. In addition, the damage to their chromosomes was 600 to 800 percent greater than that of people living 80 km away, which can signal possible conditions like cancer and reproductive effects like miscarriages. The U.S. has increased the spraying each year since 2000, including the addition of a fourth spray team in 2006. In 2006, the Colombian National Police’s Anti-Narcotics Directorate (DIRAN) sprayed more than 424,055 acres of coca. Extensive research in recent years regarding glyphosate’s toxicity to placental cells and aquatic life, among others, has prompted the U.S. Congress to seek guarantees that Colombian wetlands would not be sprayed, but the program continues to […]
Posted in Glyphosate, International | No Comments »
17
Jul
(Beyond Pesticides, July 17, 2007) A study conducted by Canadian researchers show that high concentrations of POPs, or Persistent Organic Pollutants, can be observed in humans and other air-breathing animals even though they may not accumulate in fish. This suggests that current risk assessment methodologies need to be changed for identifying potential POPs in birds and mammals. POPs are synthetic, toxic chemicals that persist in the environment, bioaccumulate in food chains and are common contaminants in fish, dairy products and other foods. These compounds are generally accepted to be hydrophobic and fat-soluble. Screening for these bioaccumulative compounds is normally conducted with laboratory tests using fish. However researchers Barry C. Kelly, and Frank Gobas, Ph.D., at Simon Fraser University in Burnaby, British Columbia report that this methodology may overlook a significant number of pollutants that pose health risks to air-breathing animals. The study entitled “Food Web—Specific Biomagnification of Persistent Organic Pollutants” (Science 2007, v317, p236) examines the biomagnification of moderately hydrophobic compounds with octanol-water partition coefficients (Kow) between 100 and 100,000 (currently, compounds with Kow greater than 100,000 are generally categorized as bioaccumulative compounds and tend to be hydrophobic and fat-soluble) and compounds with high octanol-air partition coefficients (Koa). The compounds […]
Posted in Chemicals, International, Pesticide Regulation, Wildlife/Endangered Sp. | No Comments »