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Characterization of Two Major Toxaphene Components in Treated Lake Sediment

机译：湖泊沉积物中两种主要毒杀芬成分的表征

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摘要

The structures of two environmentally significant toxaphene congeners, namely, a hexachlorobornane (Hx-Sed) and a heptachlorobornane (Hp-Sed), from the sediment of two lakes located in Alberta, Canada, have been characterized by ~1H NMR and mass spectrom-etries. Both lakes were treated in the early 1960s by the addition of toxaphene, as a pesticide, to the water column at low microgram per liter concentrations. Highest toxaphene concentrations were found in sediments of both lakes in slices dated to the early 1960s. In these slices, the chromatographic pattern resembled that of the toxaphene standard while, in more recent slices, the number of chlorinated bor-nane (CHB) peaks was greatly reduced, with the two most prominent peaks corresponding to 2-exo, 3-endo, 6-exo, 8c, 9b(or 8b, 9c),10a-hexachlorobornane and 2-exo, 3-endo, 5-exo, 6-endo, 8c, 9b(or 8b, 9c),10a-heptachlorobornane. Hx-Sed has previously been identified as one of the major reductive dechlorination metabolites of toxicant B (2-exo, 3-endo, 6, 6, 8c, 9b,-10a-heptachlorobornane), one of the most toxic components of the technical mixture. Never before, however, has it been identified as a persistent contaminant in the environment.
机译：来自加拿大艾伯塔省两个湖泊沉积物中的两种对环境具有重大影响的毒杀芬同源物的结构，即六氯硼烷（Hx-Sed）和七氯硼烷（Hp-Sed），具有〜1H NMR和质谱-礼仪。在1960年代初期，通过向水柱中添加低微克每升浓度的毒杀芬作为杀虫剂对这两个湖泊进行了处理。在两个湖泊的沉积物中发现了最高的毒杀芬浓度，可追溯到1960年代初。在这些切片中，色谱图谱与毒杀芬标准品相似，而在最近的切片中，氯化硼烷（CHB）峰的数量大大减少，其中两个最突出的峰分别对应于2-exo，3-endo ，6-exo，8c，9b（或8b，9c），10a-六氯硼烷和2-exo，3-endo，5-exo，6-endo，8c，9b（或8b，9c），10a-七氯硼烷。以前已将Hx-Sed确定为有毒物质B（2-exo，3-endo，6、6、8c，9b，-10a-七氯硼烷）的主要还原性脱氯代谢产物之一，这是该技术中毒性最高的成分之一混合物。但是，从未将其确定为环境中的持久污染物。

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