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首页> 外文期刊>Electroanalysis >Ultraselective and sensitive determination of Cr(VI) in the presence of a high excess of Cr(III) in natural waters with a complicated matrix
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Ultraselective and sensitive determination of Cr(VI) in the presence of a high excess of Cr(III) in natural waters with a complicated matrix

机译:在复杂基质的天然水中存在大量过量的Cr(III)时超选择性和灵敏地测定Cr(VI)

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摘要

In the present work, the catalytic adsorptive stripping voltammetric procedure for trace determination of Cr(VI) in the presence of a high excess of Cr(III) in natural waters with a complicated matrix has been developed. The influence from potentially interfering substances such as organic matter was successfully eliminated by exploiting adsorptive properties of polymeric resin. The detection limit estimated from 3 times the standard deviation for a low Cr(VI) concentration in the simultaneous presence of a 2 x 10(3) fold excess of Cr(III), 50 mg L-1 surfactants, 50 mg L-1 humic substances and the accumulation time of 30 s was about 5.3 x 10(-1) mol L-1.
机译:在目前的工作中,已开发出在具有复杂基质的天然水中存在大量过量的Cr(III)时,痕量测定Cr(VI)的催化吸附溶出伏安法。通过利用聚合物树脂的吸附性能,成功消除了潜在干扰物质(如有机物)的影响。在同时存在2 x 10(3)倍过量的Cr(III),50 mg L-1表面活性剂,50 mg L-1的情况下,根据低Cr(VI)浓度的标准偏差的3倍估算出检测限腐殖质和30 s的累积时间约为5.3 x 10(-1)mol L-1。

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