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首页> 外文期刊>Electroanalysis >Simultaneous determination of iron, copper, and cadmium by adsorptive stripping voltammetry in the presence of thymolphthalexone
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Simultaneous determination of iron, copper, and cadmium by adsorptive stripping voltammetry in the presence of thymolphthalexone

机译：麝香草酚甲酮存在下吸附溶出伏安法同时测定铁，铜和镉

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摘要

A novel, sensitive and selective adsorptive stripping procedure for simultaneous determination of iron, copper and cadmium is presented. The method is based on the adsorptive accumulation of thymolphthalexone (TPN) complexes of these elements onto a hanging mercury drop electrode, followed by reduction of adsorbed species by voltammetric scan using differential pulse modulation. The influences of control variables on the sensitivity of the proposed method for the simultaneous determination of iron, copper and cadmium were studied using the Derringer desirability function. The optimum analytical conditions were found to be TPN concentration of 2.0 mu M, pH of 9.5, and accumulation potential at -0.4 V vs. Ag/AgCl with an accumulation time of 60 s. The peak currents are proportional to the concentration of iron, copper and cadmium over the 1 - 80, 0.5 - 100 and 1 - 100 ng mL(-1) ranges with detection limits of 0.5, 0.4 and 0.9 ng mL(-1), respectively. The R.S.D. at a concentration level of 20 ng mL(-1) of iron, copper and cadmium were 2.5%, 0.9% and 1.5% (n=6), respectively. The procedure was applied to the simultaneous determination of iron, copper and cadmium in the tap water and some synthetic samples with satisfactory results.
机译：提出了一种同时测定铁，铜和镉的新颖，灵敏和选择性的吸附脱附方法。该方法基于这些元素的苯二酚酞（TPN）络合物的吸附积累到悬挂的汞滴电极上，然后通过使用差分脉冲调制的伏安扫描减少吸附的物质。利用Derringer期望函数研究了控制变量对所提出的同时测定铁，铜和镉的方法的灵敏度的影响。发现最佳分析条件是TPN浓度为2.0μM，pH值为9.5，相对于Ag / AgCl的-0.4 V累积电位为60 s。峰值电流与1-80、0.5-100和1-100 ng mL（-1）范围内的铁，铜和镉的浓度成正比，检出限为0.5、0.4和0.9 ng mL（-1），分别。 R.S.D.在浓度为20 ng mL（-1）的铁，铜和镉分别为2.5％，0.9％和1.5％（n = 6）。该方法用于自来水和一些合成样品中铁，铜和镉的同时测定，结果令人满意。

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