从土壤和沉积物中提取砷酸盐和亚砷酸盐物种。
Extraction of arsenate and arsenite species from soils and sediments.
作者信息
Georgiadis Myron, Cai Yong, Solo-Gabriele Helena M
机构信息
Florida International University, Department of Chemistry and Biochemistry and Southeast Environmental Research Center, University Park, Miami, FL 33199, USA.
出版信息
Environ Pollut. 2006 May;141(1):22-9. doi: 10.1016/j.envpol.2005.08.028. Epub 2005 Sep 29.
The primary objective of this study was to develop a simple method that can be used to extract the more readily mobilizable and bioavailable arsenic species from soil and sediment while at the same time minimizing the transformation between (AsIII) and (AsV), the two most commonly found arsenic species in the environment. Several extraction strategies were evaluated using phosphate as extractant in combination with either ethylenediaminetetraacetic acid (EDTA), hydroxylamine hydrochloride (NH2OH.HCl), or sodium diethyldithiocarbamate trihydrate (NaDDC). The addition of EDTA in the phosphate solution did not prevent AsIII from oxidation. While promising results were shown when 1% NH2OH.HCl was added, conversion of AsIII began to occur with extended extraction time (> 12 h). Good results were achieved using 10 mM phosphate and 0.5% NaDDC where AsIII oxidation was clearly minimized. The combined phosphate and NaDDC solution was applied to several soil and sediment samples. AsIII spiked was quantitatively recovered in all soil types tested.
本研究的主要目的是开发一种简单的方法，该方法可用于从土壤和沉积物中提取更易迁移和生物可利用的砷物种，同时尽量减少环境中最常见的两种砷物种（AsIII）和（AsV）之间的转化。使用磷酸盐作为萃取剂，结合乙二胺四乙酸（EDTA）、盐酸羟胺（NH2OH.HCl）或三水合二乙基二硫代氨基甲酸钠（NaDDC），评估了几种萃取策略。在磷酸盐溶液中添加EDTA并不能防止AsIII氧化。虽然添加1%的NH2OH.HCl时显示出了有前景的结果，但随着萃取时间延长（>12小时），AsIII开始发生转化。使用10 mM磷酸盐和0.5%的NaDDC取得了良好的结果，其中AsIII的氧化明显降至最低。将磷酸盐和NaDDC的混合溶液应用于多个土壤和沉积物样品。在所有测试的土壤类型中，加标的AsIII都能被定量回收。
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