Development and application of the diffusive gradients in thin films technique for the measurement of total dissolved inorganic arsenic in waters
Development and application of the diffusive gradients in thin films technique for the measurement of total dissolved inorganic arsenic in waters
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DOI：
10.1016/j.aca.2008.06.004
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发表时间：
2008-08-01
影响因子：
6.2
通讯作者：
Downard, Alison J.
中科院分区：
文献类型：
--
作者：
Panther, Jared G.;Stillwell, Kathryn P.;Downard, Alison J.
利用氢氧化铁吸附剂，研究了薄膜扩散梯度（DGT）技术对天然沃茨中溶解态无机砷的原位富集。采用扩散池和DGT装置测定了无机As'和As”'物种在聚丙烯酰胺凝胶中的扩散系数，并研究了可能影响As物种在氢氧化铁吸附剂上吸附或单个As物种扩散的各种因素。在环境样品中常见的条件下，溶液pH值和阴离子、阳离子、富里酸、Fe”-富里酸络合物和胶体铁氢氧化物的存在被证明不影响溶解态As的吸收。为了评价DGT作为富集和预富集天然沃茨中总溶解无机砷的方法，将DGT应用于两个加标砷的井水沃茨和河水。对于每个样品，将使用DGT然后通过具有Pd改性剂的氢化物发生原子吸收光谱法（HG-AAS）测量获得的浓度与通过HG-AAS直接测量的As浓度进行比较。结果表明，DGT是一种可靠的溶解态总砷富集方法. (c)2008 Elsevier B. V.保留所有权利。
The diffusive gradients in thin films (DGT) technique, utilizing an iron-hydroxide adsorbent, has been investigated for the in situ accumulation of total dissolved inorganic As in natural waters. Diffusion coefficients of the inorganic As' and As"' species in the polyacrylamide gel were measured using a diffusion cell and DGT devices and a variety of factors that may affect the adsorption of the As species to the iron-hydroxide adsorbent, or the diffusion of the individual As species, were investigated. Under conditions commonly encountered in environmental samples, solution pH and the presence of anions, cations, fulvic acid, Fe"-fulvic acid complexes and colloidal iron-hydroxide were demonstrated not to affect uptake of dissolved As. To evaluate DGT as a method for accumulation and pre -concentration of total dissolved inorganic As in natural waters, DGT was applied to two well waters and a river water that was spiked with As. For each sample, the concentration obtained with use of DGT followed by measurement by hydride generation atomic absorption spectrometry with a Pd modifier (HG-AAS) was compared with the concentration of As measured directly by HG-AAS. The results confirmed that DGT is a reliable method for pre -concentration of total dissolved As. (c) 2008 Elsevier B.V. All rights reserved.