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首页> 外文期刊>Indian Journal of Chemical Technology >Application of 2-nitroso-l-naphthol-4-sulphonic acid for separation and preconcentration of trace cadmium and determination by differential pulse polarography
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Application of 2-nitroso-l-naphthol-4-sulphonic acid for separation and preconcentration of trace cadmium and determination by differential pulse polarography

机译：2-亚硝基-1-萘酚-4-磺酸在痕量镉的分离富集和微分脉冲极谱法测定中的应用

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摘要

A highly selective,sensitive,rapid and economical differential pulse polarographic method has been developed for the determination of trace amount of cadmium in various standard alloys and biological samples after adsorption of its 2-nitroso-l-naphthol-4-sulphonic acid-tetradecyldimethylbenzylammonium chloride on microcrystalline naphthalene in the pH range of 5.7-11.0.After filtration,the solid mass is shaken with 9.0 mL of 1 M hydrochloric acid and cadmium is determined by differential pulse polarography (DPP).Cadmium can alternatively be adsorbed on 2-nitroso-l-naphthol-4-sulphonic acid-tetradecyldimethylbenzylammonium-naphthalene adsorbent packed in a column and determined.In this case,0.9mug of cadmium can be concentrated in a column from 300 mL of aqueous sample,where its concentration is as low as 3 ng/mL.Characterization of the electroactive process included an examination of the degree of reversibility.Various parameters such as the effect of pH,volume of aqueous phase HCl concentration,reagent concentration,naphthalene concentration,shaking time and interference of a number of metal ions on the determination of cadmium have been studied in detail to optimize the conditions for determination in standard alloys and standard biological samples.
机译：建立了一种选择性高，灵敏，快速，经济的微分脉冲极谱法，用于吸附2-亚硝基-1-萘酚-4-磺酸-十四烷基二甲基苄基氯化铵后测定各种标准合金和生物样品中的痕量镉。在5.7-11.0的pH范围内的微晶萘上过滤。过滤后，将固体物质与9.0 mL的1 M盐酸一起振摇，并通过微分脉冲极谱法（DPP）测定镉，或者将镉吸附在2-亚硝基将1-萘酚-4-磺酸-十四烷基二甲基苄基铵-萘吸附剂装填到色谱柱中进行测定。在这种情况下，可以从300 mL水溶液样品中将0.9ug的镉浓缩到色谱柱中，其浓度低至3 ng / mL。电活性过程的特征包括检查可逆性程度。各种参数，例如pH值的影响，水相HCl的体积详细研究了浓度，试剂浓度，萘浓度，摇动时间以及多种金属离子对镉的测定的干扰，以优化标准合金和标准生物样品中测定镉的条件。

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