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首页> 外文期刊>Analytica chimica acta >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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Development and application of the diffusive gradients in thin films technique for the measurement of total dissolved inorganic arsenic in waters

机译：薄膜中扩散梯度技术在水中总溶解无机砷测定中的应用

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摘要

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~V and As~(III)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~(III)-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.
机译：利用氢氧化铁吸附剂研究了薄膜（DGT）技术中扩散梯度对天然水中总溶解无机As的原位累积的影响。无机As〜V和As〜（III）种类的扩散系数使用扩散池和DGT装置对聚丙烯酰胺凝胶中的杂质进行了测定，并研究了多种可能影响As物质在氢氧化铁吸附剂上的吸附或单个As物质的扩散的因素。在通常遇到的条件下在环境样品中，溶液的pH值以及阴离子，阳离子，富里酸，Fe〜（III）-富里酸络合物和胶态铁氢氧化物的存在都不会影响溶解态As的吸收。对天然水中的总溶解无机砷进行预​​浓缩，将DGT应用于两个井水和掺有As的河水。对于每个样品，使用DGT将氢化物发生原子吸收光谱法与Pd改性剂（HG-AAS）进行测量，并将其与直接通过HG-AAS测定的As浓度进行比较。结果证实DGT是一种预浓缩总溶解As的可靠方法。

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