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首页> 外文期刊>Environmental toxicology and chemistry >IMPORTANCE OF CONTAMINATION HISTORY FOR UNDERSTANDING TOXICITY OF COPPER TO EARTHWORM EISENIA FETICA (OLIGOCHAETA: ANNELIDA), USING NEUTRAL-RED RETENTION ASSAY
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IMPORTANCE OF CONTAMINATION HISTORY FOR UNDERSTANDING TOXICITY OF COPPER TO EARTHWORM EISENIA FETICA (OLIGOCHAETA: ANNELIDA), USING NEUTRAL-RED RETENTION ASSAY

机译：使用中性红保留分析法了解污染历史对了解铜对地球上的大肠埃森菌的毒性的重要性

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Eisenia fetida was exposed in the laboratory to a range of elevated soil copper (Cu) concentrations under two different contamination histories. An EC10 for reproduction was observed at 34 mg Cu/kg for soil spiked with Cu 1 d prior to running the experiment (newly spiked soil). Soil contaminated with Cu in the field more than 70 years previously (field-contaminated soil) caused a 10 decrease in reproduction at 248 mg Cu/kg. Survival and cocoon wet weights were not affected by soil concentrations up to 1,400 mg Cu/kg under either contamination history. Adult growth was reduced at 428 mg Cu/kg (EC10) in newly spiked soil but not in field-contaminated soil at concentrations up to 1,400 mg Cu/kg. The contamination history, as well as the toxicological parameter, was important in the interpretation of the outcome of a standard laboratory toxicity test. The lysosomal membrane stability of coelomocytes, measured as neutral-red retention time (NRR-time), was reduced at soil Cu concentrations lower than those affecting reproduction and demonstrated a dose-response relationship. The NRR-time was more severely reduced in worms exposed to newly Cu-spiked soil (EC10 = 8 mg Cu/kg) than worms exposed to field-contaminated soil (EC10 = 69 mg Cu/kg). The NRR-time refiected the bioactive Cu fraction, showing a good correlation with reproduction under both contamination histories.
机译：在两种不同的污染历史下，埃塞尼亚fetida在实验室中暴露于一定范围的升高的土壤铜（Cu）浓度。在运行实验之前，对于掺有Cu 1 d的土壤（新掺入的土壤），观察到以34 mg Cu / kg的繁殖性EC10。 70年前，田间被铜污染的土壤（田间污染的土壤）在248 mg Cu / kg的情况下导致繁殖量降低10倍。在任一污染历史下，土壤浓度最高为1400 mg Cu / kg时，存活和茧湿重均不受其影响。在浓度最高为1,400 mg Cu / kg的新加标土壤中，成年生长降低为428 mg Cu / kg（EC10），但在田间污染的土壤中未降低。污染的历史以及毒理学参数对于解释标准实验室毒性测试的结果非常重要。当土壤铜浓度低于影响繁殖的铜浓度时，以中性红保留时间（NRR-time）测量的粒细胞的溶酶体膜稳定性降低了，并显示出剂量反应关系。与暴露于田地污染土壤的蠕虫（EC10 = 69 mg Cu / kg）相比，暴露于刚暴露于铜的土壤中的蠕虫（EC10 = 8 mg Cu / kg）的NRR时间更严重地减少。 NRR时间反映了生物活性Cu分数，在两种污染历史下均显示出与繁殖的良好相关性。

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