摘要
为研究酸化吹气-重铬酸钾法测定高氯地表水中化学需氧量的适用性,6家实验室使用酸化吹气-重铬酸钾法对高氯地表水中化学需氧量进行测定。结果表明,方法的检出限为4 mg/L,6家实验室对3种浓度的标准溶液(氯化物浓度均为20000 mg/L)进行精密度测定,实验室内相对标准偏差范围分别为3.4%~9.6%、2.9%~4.4%、1.7%~7.5%,实验室间相对标准偏差分别为3.2%、2.3%、3.4%;对2个不同浓度的高氯地表水实际样品进行精密度测定,实验室内相对标准偏差范围为2.7%~5.7%、2.1%~7.5%,实验室间相对标准偏差分别为4.1%、13.4%;对3种浓度的标准溶液(氯化物浓度均为20000 mg/L)进行准确度测定,实验室内相对标准偏差范围为-1.0%~11.0%、-3.0%~3.5%、-5.3%~4.0%,室间相对误差的标准偏差分别为4.0%、2.3%、3.4%。方法去除氯离子干扰效果好,精密度、准确度及检出限较好,适用于高氯地表水中化学需氧量的测定。
In order to study the applicability of blow-acidizing-dichromate method for the determination of chemical oxygen demand in high chloride surface water,we tested the chemical oxygen demand in high chloride surface water in six laboratories based on this established method.The results showed that the detection limit of this method was 4 mg/L,and the precision of three standard solutions(chloride concentration was 20000 mg/L)was tested in six laboratories,the relative standard ranges in the laboratory are 3.4%-9.6%,2.9%-4.4%,1.7%-7.5%,the relative standard deviation(RSD)between laboratories is 3.2%、2.3%,3.4%;the precision of 2 practical samples of high chlorine surface water with different concentrations was measured,the relative standard ranges in the laboratory are 2.7%-5.7%、2.1%-7.5%,the relative standard deviation(RSD)between laboratories is 4.1%、13.4%;the accuracy of three standard solutions with chloride concentration of 20000 mg/L was tested,the relative standard ranges in the laboratory are-1.0%-11.0%,-3.0%-3.5%,-5.3%-4.0%,the relative standard deviation(RSD)between laboratories is 4.0%,2.3%,3.4%.The method is suitable for the determination of chemical oxygen demand in high chlorine surface water because of its good effect of removing interference of chloride ion,good precision,accuracy and detection limit.
作者
范丽华
施玉格
达莉芳
段小燕
李刚
李媛
尤斌
贺承启
FAN Lihua;SHI Yuge;DA Lifang;DUAN Xiaoyan;LI Gang;LI Yuan;YOU Bin;HE Chengqi(Xinjiang Uygur Autonomous Ecological Environmental Monitoring Station,Urumqi,Xinjiang 830011,China)
出处
《中国无机分析化学》
CAS
北大核心
2021年第5期97-101,共5页
Chinese Journal of Inorganic Analytical Chemistry
关键词
高氯
地表水
化学需氧量
酸化吹气-重铬酸钾法
high-chlorine
surface water
chemical oxygen
blow-acidizing-dichromate method
