EFFECT OF AGING OF POLLUTANTS FOR SOIL ON BIOAVAILABILITY

在许多有机污染物在土壤中反应的长时间内， 他们似乎变得与世隔绝，行为也发生了变化。这 隔离或老化影响它们对生物降解的敏感性， 可提取性和毒性。然而，目前并不存在这种手段， 预测生物利用度随时间的变化程度， 有机化合物因此，建议进行研究（1）以确定 有机化合物和土壤的性质决定了老化 土壤在可提取性方面影响生物利用度， 生物降解性和毒性;（2）建立可行性， 利用生物降解和提取方法预测 土壤中的有机化合物植物（种子发芽，根伸长）， 微生物（硝化、艾姆斯沙门氏菌突变体回复），和 将进行无脊椎动物（对赤眼蜂的急性毒性）毒性试验， 作为一套适用于土壤传播的危险废物。在 此外，还将对衰老的机制进行研究， 发生，注意多孔和非多孔介质（合成和 天然的）、土壤性质和孔隙大小、弯曲度和分布。 重点将是一些25 14 C标记的化合物，其属性- 结果关系和已知的变化率和程度 生物降解性可能与毒性措施有关， 隔离

During the prolonged period that many organic pollutants react in soil, they appear to become sequestered and their behavior changes. This sequestration or aging affects their susceptibility to biodegradation, extractability, and toxicity. However, the means presently do not exist to predict the extent of change in bioavailability with time for any organic compound. Hence, a study is proposed (1) to determine the properties of organic compounds and of soils that govern how aging-in soil affects bioavailability in terms of extractability, biodegradability, and toxicity; and (2) to establish the feasibility of using biodegradation and extraction methods to predict toxicity of organic compounds in soil. Plant (seed germination, root elongation), microbial (nitrification, Ames Salmonella mutant reversion), and invertebrate (acute toxicity to Eisenia foetida) toxicity tests will be employed as a suite applicable to soil-borne hazardous wastes. In addition, studies will be conducted on the mechanisms by which aging occurs, with attention to both porous and non-porous media (synthetic and natural), soil properties, and pore size, tortuosity, and distribution. Emphasis will be on some 25 14C-labeled compounds for which property- outcomes relationships and shifts in known rate and extent of biodegradability may be related to measures of toxicity and sequestration.