Chlorobornanes in sediments and fish 30 years after toxaphene treatment of lakes

Article Abstract:

Rainbow trout samples and cored sediments collected from prairie lakes treated with toxaphene as pesticide in the early 1960s showed high concentrations of hepta-, octa- and nonachlorobornanes. Negative ion mass spectrometry of the sediments showed hexa- and heptachlorobornanes at levels higher than normal. These suggests that the toxaphene mixture may have been dechlorinated and redistributed by porewater diffusion. Likewise, the chromatographic patterns of the fish showed the same dechlorinated material found in the sediments. These results indicate that toxaphenes used during the 1960s still persist in the lakes.

Analysis, Insecticides, Lake sediments, Chlorination

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Soil as a source of atmospheric heptachlor epoxide

Article Abstract:

The insecticide heptachlor was used extensively fore preventing termite infestation in agricultural and home settings before its use was discontinued in 1988. Samples of heptachlor-exo-epoxide (HEPX), which is toxic and biocumulative, have been found in Ontario, the Canadian Arctic, and rivers connecting Lake Michigan. Analysis of ambient air samples reveals traces in the atmosphere are caused by metabolism of heptachlor in soils and volatilization of HEPX, and not photolysis of the chemical.

Pesticide and Other Agricultural Chemical Manufacturing, Agricultural chemicals, not elsewhere classified, Heptachlor, Soil pollution, Photochemistry

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Isolation and identification of two major recalcitrant toxaphene congeners in aquatic biota

Article Abstract:

Research has identified as many as 20 peaks of toxaphene, or polychlorinated camphene (PCC) in the fish and marine mammals of North America and Europe. The contamination of these populations is due to the extensive use of toxaphene as an insecticide in the 1960s and 1970s. Using H NMR spectroscopy and mass spectrometry, Canadian researchers have found that two of these PCCs, a previously unknown octachlorocamphene and a nonachlorcamphene, predominate. Their research is described in detail.

Testing laboratories, Fishes, Organic water pollutants, Organic water pollution, Marine mammals

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