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首页> 外文期刊>Environmental toxicology and chemistry >BIOACCUMULATION OF METALS IN EISENIA FETIDA AFTER EXPOSURE TO A METAL-LOADED BAUXSOL™ REAGENT
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BIOACCUMULATION OF METALS IN EISENIA FETIDA AFTER EXPOSURE TO A METAL-LOADED BAUXSOL™ REAGENT

机译：暴露于金属负载的BAUXSOL™试剂后，艾森森中的金属的生物累积

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摘要

The present study investigated the acute toxic effects of a metal-loaded Bauxsol™ reagent (MLBR), containing more than 6,450 mg kg~(-1) of bound metal, on the earthworm Eisenia fetida. Bauxsol is manufactured by Virotec Global Solutions of Gold Coast, Queensland, Australia. The E. fetida were exposed to 0, 10, 20, 40, 60, and 80% treatments of MLBR plus cow manure for 28 d. Good motility and no mortality of E. fetida were found in all treatments after 28 d of exposure. The greatest bioaccumulation of metals by E. fetida occurred in the 20 and 40% MLBR treatments. The bioaccumulation of metals in the worms and bioaccumulation factors (BAFs) were less than the reported toxicity thresholds to cause mortality and less than the reported BAF for moderately contaminated soils, indicating that metals bound to Bauxsol reagents are mostly nonbioavailable. Analyses of the 20% MLBR treatment at 28 d using a sequential extraction procedure showed that more than 95% of the metals are bound within the Fe/Mn oxide fractions. However, changes occurred in metal fractionation after exposure to E. fetida for Cd/Cr, and Fe/Mn. The data also showed that the exchangeable (1 M MgCl_2) and the toxicity characteristic leaching procedure extractant are useful as indicators of metal bioavailability from MLBR to E. fetida.
机译：本研究研究了载有金属的Bauxsol™试剂（MLBR）对6，Eisenia fetida的急性毒性，该试剂含有超过6,450 mg kg〜（-1）的结合金属。 Bauxsol由澳大利亚昆士兰州黄金海岸的Virotec全球解决方案制造。将f。fetida暴露于MLBR加牛粪的0％，10％，20％，40％，60％和80％处理28天。在暴露28 d后的所有处理中均未发现F. fetida具有良好的运动性和死亡率。在20％和40％的MLBR处理中，由F. fetida产生的金属最大的生物累积量。蠕虫中金属的生物累积量和生物累积因子（BAF）低于所报告的导致死亡的毒性阈值，并且低于中度污染土壤的所报告BAF，这表明与Bauxsol试剂结合的金属大部分是不可生物利用的。使用顺序萃取程序对28 d进行20％MLBR处理的分析表明，超过95％的金属结合在Fe / Mn氧化物级分内。但是，在暴露于Fetida的Cd / Cr和Fe / Mn后，金属分馏发生了变化。数据还表明，可交换的（1 M MgCl_2）和毒性特征浸出程序萃取剂可用作从MLBR到大肠埃希菌的金属生物利用度的指标。

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