Changes in soil toxicity by phosphate-aided soil washing: Effect of soil characteristics, chemical forms of arsenic, and cations in washing solutions
Changes in soil toxicity by phosphate-aided soil washing: Effect of soil characteristics, chemical forms of arsenic, and cations in washing solutions
复制标题
DOI：
10.1016/j.chemosphere.2014.10.038
复制
发表时间：
2015-01-01
期刊：
影响因子：
8.8
通讯作者：
Nam, Kyoungphile
中科院分区：
文献类型：
--
作者：
Jho, Eun Hea;Im, Jinwoo;Nam, Kyoungphile
本研究旨在探讨砷污染土壤经磷酸盐溶液洗涤后毒性的变化。从两个地点（A：稻田和B：林地）的前冶炼厂的网站收集的土壤样品被污染的类似水平的As。土壤洗涤（0.5 M磷酸盐溶液2小时）去除24.5%，平均而言，从两个位置的土壤。无论土壤洗涤，位置A的土壤毒性，确定使用Microtox，大于位置B，这可能在很大程度上归因于不同的土壤粒径分布。从这两个位置的土壤，在化学形态的变化导致类似或更大的毒性后，洗涤。这强调了考虑生态毒理学方面的重要性，这是可能不同的土壤颗粒大小分布和变化的化学形式，除了总浓度为基础的补救目标，在生产生态毒理学健全的土壤再利用。此外，磷酸钙作为洗涤液似乎比磷酸钾和磷酸铵对洗涤土壤的毒性作用更大。因此，在砷污染土壤的磷助洗中，使用磷酸钾或磷酸铵比使用磷酸钙更合适。(C)2014爱思唯尔有限公司版权所有。
This study was set to investigate the changes in the toxicity of arsenic (As)-contaminated soils after washing with phosphate solutions. The soil samples collected from two locations (A: rice paddy and B: forest land) of a former smelter site were contaminated with a similar level of As. Soil washing (0.5 M phosphate solution for 2 h) removed 24.5% As, on average, in soil from both locations. Regardless of soil washing, Location A soil toxicities, determined using Microtox, were greater than that of Location B and this could be largely attributed to different soil particle size distribution. With soils from both locations, the changes in As chemical forms resulted in either similar or greater toxicities after washing. This emphasizes the importance of considering ecotoxicological aspects, which are likely to differ depending on soil particle size distribution and changes in As chemical forms, in addition to the total concentration based remedial goals, in producing ecotoxicologically-sound soils for reuse. In addition, calcium phosphate used as the washing solution seemed to contribute more on the toxic effects of the washed soils than potassium phosphate and ammonium phosphate. Therefore, it would be more appropriate to use potassium or ammonium phosphate than calcium phosphate for phosphate-aided soil washing of the As-contaminated soils. (C) 2014 Elsevier Ltd. All rights reserved.