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PASSIVE SAMPLING OF PESTICIDES AND POLYCHLORINATED BIPHENYLS ALONG THE QUEQUEN GRANDE RIVER WATERSHED, ARGENTINA
Silva-Barni, M.F., F. Smedes, G. Fillmann, and K.S.B. Miglioranza.
Environmental Toxicology and Chemistry 38(2):340-349(2019)
An integrative silicone rubber passive sampling technique was used in a year-long study to measure organochlorine pesticides, PCBs, and other pesticides along the Quequen Grande River watershed. Silicone rubber samplers were deployed at six sampling sites, selected according to different land use, during 3 periods in 2014 and 2015. Organochlorine pesticides were dominated by endosulfan (sum of α-, β-endosulfan, and endosulfan sulfate=0.15-23.4 ng/L). The highest levels occurred during a pesticide application period from December-March when levels exceeded the 3 ng/L international water quality guidelines for protecting freshwater biota. Compared with previous reports, no reductions in endosulfan levels were observed, suggesting illegal use of the banned pesticide. Chlorpyrifos, widely used on soybean crops, was the second major pesticide found in water (0.02-4.3 ng/L). A reduction in levels of legacy pesticides (heptachlors, DDTs, dieldrin, and chlordanes) was evident compared with previous reports from 2007. Low levels of PCBs indicated that only minor diffuse sources were present along the watershed.
Environmental Toxicology and Chemistry 38(2):340-349(2019)
An integrative silicone rubber passive sampling technique was used in a year-long study to measure organochlorine pesticides, PCBs, and other pesticides along the Quequen Grande River watershed. Silicone rubber samplers were deployed at six sampling sites, selected according to different land use, during 3 periods in 2014 and 2015. Organochlorine pesticides were dominated by endosulfan (sum of α-, β-endosulfan, and endosulfan sulfate=0.15-23.4 ng/L). The highest levels occurred during a pesticide application period from December-March when levels exceeded the 3 ng/L international water quality guidelines for protecting freshwater biota. Compared with previous reports, no reductions in endosulfan levels were observed, suggesting illegal use of the banned pesticide. Chlorpyrifos, widely used on soybean crops, was the second major pesticide found in water (0.02-4.3 ng/L). A reduction in levels of legacy pesticides (heptachlors, DDTs, dieldrin, and chlordanes) was evident compared with previous reports from 2007. Low levels of PCBs indicated that only minor diffuse sources were present along the watershed.
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