Is the OECD acute worm toxicity test environmentally relevant? The effect of mineral form on calculated lead toxicity

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• 作者：Davies ; Nicola A. ; Hodson ; Mark E. ; Black ; Stuart
• 关键词：Metals ; Bioavailability ; Earthworms ; Ecotoxicological testing ; Eisenia fetida
• 刊名：Environmental Pollution
• 出版年：2003
• 期刊代码：28_02697491
• 类别：env
• 出版时间：January, 2003
• 卷：121
• 期：1
• 页码：49-54
• 文件大小：130 K

摘要

In a series of experiments the toxicity of lead to worms in soil was determined following the draft OECD earthworm reproduction toxicity protocol except that lead was added as solid lead nitrate, carbonate and sulphide rather than as lead nitrate solution as would normally be the case. The compounds were added to the test soil to give lead concentrations of 625–12 500 μg Pb g^−1 of soil. Calculated toxicities of the lead decreased in the order nitrate>carbonate>sulphide, the same order as the decrease in the solubility of the metal compounds used. The 7-day LC₅₀ (lethal concentration when 50%of the population is killed) for the nitrate was 5321±275 μg Pb g^−1 of soil and this did not change with time. The LC₅₀ values for carbonate and sulphide could not be determined at the concentration ranges used. The only parameter sensitive enough to distinguish the toxicities of the three compounds was cocoon (egg) production. The EC₅₀s for cocoon production (the concentration to produce a 50%reduction in cocoon production) were 993, 8604 and 10 246 μg Pb g^−1 of soil for lead nitrate, carbonate and sulphide, respectively. Standard toxicity tests need to take into account the form in which the contaminant is present in the soil to be of environmental relevance.