Extractability and bioavailability of Pb and As in historically contaminated orchard soil: effects of compost amendments.
Extractability and bioavailability of Pb and As in historically contaminated orchard soil: effects of compost amendments.
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DOI：
10.1016/j.envpol.2013.02.013
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发表时间：
2013-06
期刊：
影响因子：
--
通讯作者：
McBride MB
中科院分区：
文献类型：
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作者：
Fleming M;Tai Y;Zhuang P;McBride MB
铅和砷在历史上污染的果园土壤中的可用性，堆肥和老化后的修正案，在现场，测定单步化学提取与1.0 M乙酸铵在pH 4.8，连续提取使用的修改BCR测试，和红虫生物测定在实验室中。乙酸铵提取土壤铅的效率是在较高的土壤总铅，但降低堆肥的修正。相反，土壤全砷的提取效率随着堆肥的添加而增加，但对土壤全砷的提取不敏感。红虫的生物测定表明，铅（但不是As）的生物有效性降低土壤改良剂与堆肥，结果与乙酸铵提取试验，但没有反映在修改后的BCR测试。果园土壤的电子探针研究表明，铅和砷是空间上与离散颗粒沿着与磷和铁。
The availability of Pb and As in an historically contaminated orchard soil, after amendment with compost and aging in the field, was determined by single-step chemical extraction with 1.0 M ammonium acetate at pH 4.8, sequential extraction using the modified BCR test, and a redworm bioassay in the laboratory. The efficiency of soil Pb extraction by ammonium acetate was greater at higher total soil Pb but was reduced by compost amendment. Conversely, the extraction efficiency of total soil As increased with compost amendment, but was not sensitive to total soil As. The redworm bioassay indicated Pb (but not As) bioavailability to be reduced by soil amendment with compost, a result consistent with the ammonium acetate extraction test but not reflected in modified BCR test. Electron microprobe studies of the orchard soil revealed Pb and As to be spatially associated in discrete particles along with phosphorus and iron.