改进镉柱分光光度法测定奶制品中硝酸盐及亚硝酸盐

Determination of nitrate and nitrite concentrations in milk product by spectrophotometry of cadmium column reduction

目的:建立镉柱还原分光光度法测定奶制品中硝酸盐和亚硝酸盐的方法。方法:采用进口镉粒,用耐酸碱的活塞旋钮滴定管替代镉柱玻璃管,对国家标准方法镉柱法进行改进后,测定奶制品中硝酸盐和亚硝酸盐,结果:测定结果与国标测定方法一致。结论:经改进后的镉柱法测定奶制品中硝酸盐及亚硝酸盐,制备镉柱简单,再生镉粒冲洗简便,还原效率高,方法简单,省时省力,准确快速。

Objective：To develop a method of examining the concentrations of nitrate and nitrite in milk product by spectrophotometry of cadmium column reduction.Methods：Cadmium column and acid-base resisting burette with knob-operated control were used to determine nitrate and nitrite in milk product.The method of national standard was improved.Results：The developed method with cadmium column reduction methods was indifferent with the method of national standard in determining of nitrate and nitrite in milk product.Conclusion：The developed method can quantify nitrate and nitrite in milk product with satisfactory sensitivity,accuracy and precision.Cadmium column reducing and cadmium granule reproducing are simple and fast in operation.