84消毒液有效氯含量测定方法改进

To Improve Determination of Active Chlorine in 84 Disinfectant

建立返滴定法测定84消毒液中有效氯。在硫酸介质中,84消毒液中有效氯和K2Cr2O7均可与Fe^2+发生定量反应,用0.0010 mol/L K2Cr2O7标准溶液同步完成有效氯反应液中过剩Fe^2+测定,计算有效氯含量。有效氯在0~5.50 mg范围内与其耗用K2Cr2O7标准滴定溶液体积呈线性关系,相关系数为0.9998,方法的检出限(3S/k)为6.8μg。相对滴定度TNaClO/K2Cr2O7=0.2483 mg/mL。方法用于样品中有效氯测定,简单、快速、干扰少,优于传统滴定法。

The active chlorine in 84 disinfectant was determined by back titration.The active chlorine in 84 disinfectant and K2Cr2O7 can be quantitatively reacted with Fe^2+ in the sulfuric acid.The excess Fe^2+ in the active chlorine react with 0.0010 mol/L K2Cr2O7 standard solution,and active chlorine content was calculated.Active chlorine within 0~5.50 mg was linearly dependent on the K2Cr2O7 standard solution,the correlation coefficient is 0.9998 and the detection limit of the method(3S/k)is 6.8μg.This methods for the determination of active chlorine in samples was simple,fast,and less interference than traditional titration.The relative titer is TNaClO/K2Cr2O7=0.2483 mg/mL.