Chemical Extractability of Pb in Field-Contaminated Soils: Implications for Estimating Total Pb.
Chemical Extractability of Pb in Field-Contaminated Soils: Implications for Estimating Total Pb.
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DOI：
10.1080/00103624.2011.581729
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发表时间：
2011
影响因子：
1.8
通讯作者：
Baker LL
中科院分区：
文献类型：
--
作者：
McBride MB;Mathur RR;Baker LL
铅(Pb2+)常存在于城市土壤中，浓度严重影响人类健康。对这种金属的监管是以酸消化测定的土壤总浓度为基础的，但如果能够证明铅与土壤总铅有很强的相关性，那么成本较低的铅筛选测试将有助于对城市地区进行更彻底的土壤测试。本研究评价了三种萃取剂(0.1M柠檬酸、改良Morgan、1M硝酸)对污染土壤中全铅的测定能力。硝酸不仅提取了土壤总铅的较大比例，而且与总铅的相关性最强，是土壤铅筛选试验的最佳萃取剂。由于所选土壤中铅的空间分布在微米尺度上高度不均匀，因此建议在测试之前对土壤进行彻底的均质处理。
Lead (Pb) is frequently present in urban soils at concentrations of concern for human health. Regulations for this metal are based on total soil concentrations as determined by acid digestion, but a less expensive screening test for Pb would be useful in facilitating more thorough soil testing of urban areas if it could be shown to correlate strongly to total soil Pb. In this study, three extractants (0.1 M citrate, Modified Morgan, 1 M nitric acid) were evaluated for their ability to estimate the total Pb in contaminated soils. Nitric acid not only extracted a greater fraction of total soil Pb, but also produced the strongest correlation to total Pb and is concluded to be the superior extractant for a soil Pb screening test. As the spatial distribution of Pb was observed in selected soils to be highly heterogeneous on the micron scale, thorough soil homogenization prior to testing is recommended.