氯酚红示差分光光度法测定水样中低浓度二氧化氯

目的根据二氧化氯(ClO2)可氧化氯酚红,并使其褪色的特性,用示差分光光度法测定水中低浓度ClO2的含量。方法采用示差分光光度法在波长574 nm处进行扫描定量。结果实验显示该方法在0.10~0.50、0.60~1.31、0.50~2.70 mg/L的范围以内线性相关系数都较高,线性较好。结论 ClO2的浓度在0.10~0.50 mg/L以上时,该方法标准曲线线性度较好,测定的准确度和精确度较高,特别适合饮用水中低浓度ClO2的测定。

Determination of Chlorine Dioxide in Water by Chlorophenol Red Differential Spectrophotometry

Objective To establish differential spectrophotometry method to determine chlorine dioxide（ClO2） in drinking water.Methods The differential spectrophotometry method was conducted to scan in wave length of 574 nm.Results The experiment demonstrated that linear correlation coefficient was high when the ranges were 0.10-0.50 mg/L,0.26-1.31 mg/L,and 0.50-2.70 mg/L,the linearity was good.Conclusion The method has good accuracy and precision,it is suitable for determination of low concentration chlorine dioxide.