An assay for inorganic mercury(II) based on its post-catalytic enhancement effect on the potassium permanganate-luminol system.
An assay for inorganic mercury(II) based on its post-catalytic enhancement effect on the potassium permanganate-luminol system.
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DOI：
10.1002/bio.914
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发表时间：
2006-07
期刊：
影响因子：
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通讯作者：
Shangwei Hu;Weibing Liu;Yuming Huang;W. Shu;Jia Cao
中科院分区：
文献类型：
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作者：
Shangwei Hu;Weibing Liu;Yuming Huang;W. Shu;Jia Cao
将高锰酸钾溶液注入鲁米诺碱性溶液中，观察到强烈的化学发光(CL)反应。当CL反应结束时，随后将Hg2+溶液注入反应混合物中会导致新的CL反应。基于Hg2+对碱性介质中高锰酸钾-鲁米诺体系的后催化增敏作用，建立了测定Hg2+的化学发光耦合流动注射分析方法。在最佳条件下，荧光强度与Hg2+浓度在1.0×10~(-8)~1.0×10~(-5)g/m L范围内呈良好的线性关系，检出限为2.0×10~(-9)g/m L。对1.0×10~(-7)g/mLHg2+(n=11)进行测定，相对标准偏差为3.6%。环境水样经巯基棉前处理后，用该法测定总汞，结果令人满意。测定结果与氢化物发生-冷原子吸收光谱分析(HG-CVAAS)结果一致。
A strong chemiluminescence (CL) response is observed when potassium permanganate solution is injected into basic luminol solution. When the CL reaction terminates, subsequent injection of Hg2+ solution into the reaction mixture results in a new CL reaction. Based on the post-catalytic enhancement effect of Hg2+ on the potassium permanganate-luminol system in basic media, a fast and simple CL-coupled flow injection analysis for the determination of Hg2+ was developed. In optimum conditions, CL intensity is proportional to Hg2+ concentration over the range 1.0 x 10(-8)-1.0 x 10(-5) g/mL, with a detection limit of 2.0 x 10(-9) g/mL. The relative standard deviation (RSD) is 3.6% for 1.0 x 10(-7) g/mL Hg2+ (n = 11). After pretreatment with sulphydryl cotton fibre, environmental water samples were analysed by the proposed method for total mercury determination with satisfactory results. The results were in good agreement with those given by hydride generation-cold vapour atomic absorption spectrometry (HG-CVAAS).