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Scientists Cite Pesticides’ Multigeneration Effects, Call for Regulation

Thursday, October 18th, 2007

(Beyond Pesticides, October 18, 2007) In a scholarly review written by Theo Colborn, Ph.D. and Lynn Carroll, Ph.D., the authors point to the multigenerational effects of some pesticides that they say demand improved regulation to protect human and environmental health. The review, “Pesticides, Sexual Development, Reproduction, and Fertility: Current Perspective and Future Direction,” appears in the international journal Human and Ecological Risk Assessment (13:5, 1078 — 1110), September, 2007. The study points out a major deficiency in the U.S. Environmental Protection Agency’s regulation of pesticides under current health reviews and risk assessments. The authors call EPA’s pesticide registration system “outmoded” and one that has “almost completely missed the low-dose and endocrine system-mediated effects of pesticides.” The study reviews both epidemiological and laboratory data. In the abstract, the authors state the following: Improvements in chemical analytical technology and non-invasive sampling protocols have made it easier to detect pesticides and their metabolites at very low concentrations in human tissues. Monitoring has revealed that pesticides penetrate both maternal and paternal reproductive tissues and organs, thus providing a pathway for initiating harm to their offspring starting before fertilization throughout gestation and lactation. This article explores the literature that addresses the parental pathway of exposure […]

Posted in Chemicals, Children/Schools, DDT, Disease/Health Effects, Endocrine Disruption | 1 Comment »

Research Suggests That Risk Assessments for POPs Need Revision

Tuesday, July 17th, 2007

(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 »

Order of Exposure Can Make the Poison

Thursday, July 5th, 2007

(Beyond Pesticides, July 5, 2007) A new study showing that the order of exposure to multiple pesticides may be just as important as the dose, timing and length of exposure adds another dimension to the complex task of risk assessments. Using carbaryl and chlorpyrifos, University of York scientists have observed significant differences in mortality rates of freshwater invertebrates depending on the order of exposure to these frequently used agricultural chemicals. The study, Modeling Combined Effects of Pulsed Exposure to Carbaryl and Chlorpyrifos on Gammarus Pulex, suggests the sequence of pesticide exposure may be just as important of a variable as the dose, the timing of the dose and the length of exposure when factoring environmental and health endpoints. The researchers conducted the study by exposing the freshwater invertebrate Gammarus pulex — a tiny shrimp — to pulses of the two insecticides (both of which affect the nervous system through acetylcholinesterase inhibition) mimicking exposure to chemical mixtures in the environment — for example, farmers may apply several different pesticides over the growing season that run off into the aquatic environment. After receiving a pulse of one pesticide, the shrimp were given 14 days, a time period chosen based on previous experiments, […]

Posted in Carbaryl, Chlorpyrifos, Pesticide Regulation, Water | No Comments »

EPA Sued Over Pesticides Harmful to 11 Bay Area Endangered Species

Wednesday, May 30th, 2007

(Beyond Pesticides, May 30, 2007) The Center for Biological Diversity today filed a lawsuit against the U.S. Environmental Protection Agency (EPA) for violating the Endangered Species Act (ESA). EPA has registered and allowed the use of 60 toxic pesticides in habitats for nearly a dozen San Francisco Bay Area endangered species without determining whether the chemicals jeopardize their existence. “Ending the use of known poisons in habitat for our most endangered wildlife is an appropriate 100th birthday tribute to Rachel Carson, who alerted us to the hazards of exposure to toxic chemicals almost half a century ago,” said Jeff Miller, conservation advocate with the Center. “Unfortunately the EPA has not learned from her legacy and still has no plan to adequately assess impacts while registering and approving pesticide uses that pose a clear and present danger both to imperiled species and human health.” At least 61 million pounds of pesticide active ingredients were applied in Bay Area counties from 1999 through 2005 ”” over 8.5 million pounds annually. Actual pesticide use may have been several times this amount since most home and commercial pesticide use is not reported to the state. Under the Bush administration, EPA has consistently failed to […]

Posted in Litigation, Pesticide Regulation, Wildlife/Endangered Sp. | No Comments »

Rep. Solis Demands Answers on Environmental Justice from EPA

Monday, March 12th, 2007

(Beyond Pesticides, March 12, 2007) Environmental Protection Agency (EPA) Administrator Stephen Johnson appeared before the Environmental and Hazardous Materials and Energy and Air Quality Subcommittees of the House Energy and Commerce Committee on March 8, 2007 to discuss the EPA’s Budget for the first time in his six-year tenure as Administrator. Representative Hilda Solis (D-CA) pressed the Administrator for answers related to EPA’s Performance Track Program, the closure of EPA libraries, changes made to the Toxic Release Inventory, closure of Region 10’s Office of Environmental Justice, failure to implement the Executive Order 12898 on Environmental Justice (EJ), and the overall budget for environmental justice. According to Rep. Solis, three Monsanto facilities are members of the Performance Track Program, despite the fact that their parent company paid one million dollars in fines to the Department of Justice last year after being criminally indicted in 2005. Eligibility of the program requires that a company not be convicted of any environmental fines within the past five years. When asked why the three Monsanto facilities were members, Mr. Johnson deferred to staff from EPA to comment, at which time Rep. Solis was told they must review the documents and respond at a later date. […]

Posted in Children/Schools, Disease/Health Effects, National Politics | No Comments »

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