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Selenium:mercury molar ratios in fish from the Savannah River:implications for risk management

机译:萨凡纳河鱼中硒与汞的摩尔比:风险管理的意义

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The risk to humans from contaminants in fish is dealt with by issuing consumption advisories, which are devised from consumption patterns, contaminant levels, and toxicity of those contaminants. The primary contaminant of concern in fish is mercury, and recently it has been suggested that the protective effects of selenium on mercury toxicity should be considered in risk management. The relationships between mercury, fish species and fish size, and seleniumrmercury (Se:Hg) molar ratios were examined for freshwater fish from the Savannah River. The data indicated: (1) significant variation in Se:Hg molar ratios among and within species, (2) mean selenium molar ratios for the 11 species were negatively correlated with mean mercury levels and mean fish length, (3) greater variation in individual variances within species than the variation in mean ratios among species, (4) some species with high mean ratios had individuals with ratios below 1, and (5) even the species with the highest mean ratios had some individuals close to a molar ratio of one. These data suggest that the great variability of the Se:Hg molar ratios within a species results in the ratios being unpredictable. That is, knowing the mean Se:Hg molar ratio for a given species does not predict the ratios of individuals, or thus the protectiveness of selenium on mercury toxicity.
机译:鱼中污染物对人类的风险是通过发布消费建议来解决的,这些建议是根据消费方式,污染物水平和这些污染物的毒性而制定的。鱼中主要关注的污染物是汞,最近有人建议在风险管理中应考虑硒对汞毒性的保护作用。检查了萨凡纳河中的淡水鱼的汞,鱼的种类和鱼的大小以及硒汞(Se:Hg)摩尔比之间的关系。数据表明:(1)种间和种内Se:Hg摩尔比的显着变化;(2)11种物种的平均硒摩尔比与平均汞含量和平均鱼长呈负相关;(3)个体间的较大变化种内差异大于种间平均比率的变化;(4)一些平均比率高的物种的个体的比率低于1,(5)即使平均比率最高的物种的某些个体的摩尔比也接近1 。这些数据表明,一个物种中Se:Hg摩尔比的巨大变化导致该比不可预测。也就是说,知道给定物种的平均Se:Hg摩尔比并不能预测个体的比例,也不能预测硒对汞毒性的保护作用。

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