催化吸附溶出伏安法测定痕量钼
Determination of traces molybdenum by catalytic adsorptive stripping voltammetry.
作者信息
Ensafi Ali A, Khaloo Shokooh S
机构信息
College of Chemistry, Isfahan University of Technology, Isfahan 84156, Iran.
出版信息
Talanta. 2005 Feb 15;65(3):781-8. doi: 10.1016/j.talanta.2004.08.006.
A reliable and very sensitive procedure for the determination of ultra trace of molybdenum is proposed. Molybdenum was determined by cathodic stripping differential pulse voltammetry based on the adsorption collection of the Mo(VI)-Tiron complex on a hanging mercury drop electrode (HMDE). The variation of peak current with pH, concentration of Tiron and chlorate, plus several instrumental parameters such as accumulation time, accumulation potential and scan rate, were optimized. Under optimized condition, the relationship between the peak current and molybdenum concentration is linear in the range of 0.010-21.0ngml(-1). The limit of detection was found to be 0.006ngml(-1). The relative standard deviation for 10 replicates determination of 0.6 and 10ngml(-1) Mo(VI) is equal to 1.3 and 0.9%, respectively. The method was applied to the determination of molybdenum in river water, tap water, well water, plant foodstuff samples such as cucumber, tomato, carrot, and certified steel reference materials.
提出了一种可靠且非常灵敏的测定超痕量钼的方法。基于钼（VI）-钛铁试剂络合物在悬汞滴电极（HMDE）上的吸附富集，采用阴极溶出微分脉冲伏安法测定钼。优化了峰电流随pH值、钛铁试剂浓度、氯酸盐浓度的变化，以及诸如富集时间、富集电位和扫描速率等几个仪器参数。在优化条件下，峰电流与钼浓度在0.010 - 21.0 ng ml⁻¹范围内呈线性关系。检测限为0.006 ng ml⁻¹。对0.6和10 ng ml⁻¹钼（VI）进行10次重复测定的相对标准偏差分别为1.3%和0.9%。该方法应用于河水、自来水、井水、黄瓜、番茄、胡萝卜等植物性食品样品以及标准钢参考物质中钼的测定。
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