摘要
本文研究了亚硝酸根的一个新指示反应。在稀磷酸溶液中,依文思蓝-溴酸钾的氧化还原反应受亚硝酸盐催化使依文思蓝褪色。测定灵敏度为7.8×10^(-11)g/mL亚硝酸态氮[当lg(Ao/A)=0.001 b=l cm)。测定范围0—3.5μg NO_2/25mL,相对标准偏差1.64%。已用于测定自来水和唾液中的NO_2^-。
A new indicator reation of nitrite is studied. It is based on the oxidation-reduction of Evan's blue with potassium bromate in the solution of diluteH_3PO_4 catalyzed decolorizing reaction by nitrite itself. The sensitity ofdetermination is 7.8×10^(-11)g/mL N in NO_2^- [based on 1g (A_0/A) =0.001,b=1cm]. The determination range is 0 to 3.5μg/25mL for NO_2^-. The vati-ation cofficients is 1.64%. This method was applied to the determination of microtrace amounts ofnitrite in water samples and saliva with satisfactry results.
基金
国家自然科学基金
关键词
亚硝酸根
测定
分光光度法
溴酸钾
determination
nitrite
catalytic spectrophotometric method
Evan's blue
potassium bromate
