高氯酸铁可见分光光度法测定水中叠氮化物研究

基于Fe~(3+)显色技术,建立了测定地表水、地下水、生活污水和工业废水中叠氮化物的高氯酸铁分光光度法。研究结果表明:N_3~-与Fe~(3+)反应生成的棕红色络合物的特征吸收峰为454 nm;氨基磺酸铵可有效掩蔽NO_2~-的干扰,蒸馏能消除色度、CN~-、SCN~-硫化物等对测定的影响;当取样体积为150 mL、蒸馏定容体积为100 mL、使用10 mm比色皿时,方法检出限为0.08 mg/L(以N_3~-计),测定下限为0.32 mg/L;平均回收率为88.0%~104%,相对标准偏差(n=6)为0.3%～5.6%。对实际工业废水样品进行了测定,结果为1.37 mg/L。该方法准确度高、精密度好、操作简单,能够满足水污染物排放标准中叠氮化物的测定要求。

Determination of Azide in Water by Visible Spectrophotometry with Ferric Perchlorate

A spectrophotometry for the determination of azide in surface water, groundwater, domestic sewage and industrial waste-water was established based on ferric perchlorate chromogenic technology.The results showed that the characteristic absorption peak of the brown red complex formed by the reaction of N₃^- with Fe³⁺ was 454 nm.Ammonium sulfamate could effectively mask the interference of NO₂^- and distillation could eliminate the influence of chroma, CN^-, SCN^- and sulfide on the determination.When the sample volume was 150 mL, the distillation volume was 100 mL in 10 mm cuvette, the detection limit was 0.08 mg/L (based on N₃^-) and the lower limit of determination was 0.32 mg/L.The average recovery ranged 88.0%-104%, and the relative standard deviation(n=6) was 0.3%-5.6%.The result of one industrial wastewater sample was 1.37 mg/L.The method had good precision, high accuracy, simplicity and stability, which could meet the detection requirements of azide in water pollutant discharge standard.