摘要
基于在硫酸介质中 ,亚硝酸根对高碘酸钾氧化酚藏花红褪色反应具有较强的催化作用 ,建立了测定痕量亚硝酸根的催化动力学光度法。线性范围为 0 .12～ 1.2 2mg/L ,相关系数为 0 .999 0 ,检出限为 0 .0 16mg/L。用于食品中痕量亚硝酸根的测定 ,测定结果的相对标准偏差为 2 .6 %～ 4 .2 % ,回收率为 97%～ 10 3%。
A new catalytic kinetic spectrophotometry for the determination of trace nitrite ion was proposed. This method is based on the nitrite-catalyzed redox reaction between phenosafranine and potassium periodate in sulfuric acid. The linear range for nitrite ion is 0.12 ～ 1.22 mg/L with the correlative coefficient of 0.9990. The detection limit is 0.016 mg/L. The method was used to determine trace nitrite ion in food samples, the relative standard deviation is 2.6%～4.2%, the recovery is 97%～103%.
出处
《化学分析计量》
CAS
2004年第4期21-23,共3页
Chemical Analysis And Meterage
基金
上饶师范学院科研基金资助项目 ( 0 3 12 )
