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投稿时间:2021-01-22 修订日期:2021-06-30
投稿时间:2021-01-22 修订日期:2021-06-30
中文摘要: 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,该方法的检出限为4mg/L,6家实验室对3种浓度的标准溶液(氯化物浓度均为2万mg/L)进行精密度测试,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试,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2万mg/L)进行准确度测试,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。
中文关键词: 高氯 地表水 化学需氧量 酸化吹气-重铬酸钾法
Abstract: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 using the Method. The results showed that the detection limit of this method was 4mg/L, and the precision of three standard solutions (chloride concentration was 20000mg/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 20000mg/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.
文章编号: 中图分类号: 文献标志码:
基金项目:
作者 | 单位 | |
范丽华 | 新疆维吾尔自治区生态环境监测总站 | 365356548@qq.com |
施玉格* | 新疆维吾尔自治区生态环境监测总站 | 398971475@qq.com |
达莉芳 | 新疆维吾尔自治区生态环境监测总站 | |
段小燕 | 新疆维吾尔自治区生态环境监测总站 | |
李 刚 | 新疆维吾尔自治区生态环境监测总站 | |
李 媛 | 新疆维吾尔自治区生态环境监测总站 | |
尤 斌 | ||
贺承启 |
引用文本:
范丽华,施玉格,达莉芳,段小燕,李 刚,李 媛,尤 斌,贺承启.酸化吹气-重铬酸钾法测定高氯地表水中化学需氧量方法适用性研究[J].中国无机分析化学,2021,11(5):97-101.
shiyuge,shiyuge,DA Lifang,DUAN Xiaoyan,LI Gang,LI Yuan,YOU Bin,HE Chengqi.Study on the adaptability of acidified Blow -Acidizing -Dichromate method for the determination of chemical oxygen demand in high chloride surface waterFAN Lihua, SHI Yuge *, DA Lifang, DUAN Xiaoyan, LI Gang, LI Yuan, YOU Bin, HE Chengqi[J].Chinese Journal of Inorganic Analytical Chemistry,2021,11(5):97-101.
范丽华,施玉格,达莉芳,段小燕,李 刚,李 媛,尤 斌,贺承启.酸化吹气-重铬酸钾法测定高氯地表水中化学需氧量方法适用性研究[J].中国无机分析化学,2021,11(5):97-101.
shiyuge,shiyuge,DA Lifang,DUAN Xiaoyan,LI Gang,LI Yuan,YOU Bin,HE Chengqi.Study on the adaptability of acidified Blow -Acidizing -Dichromate method for the determination of chemical oxygen demand in high chloride surface waterFAN Lihua, SHI Yuge *, DA Lifang, DUAN Xiaoyan, LI Gang, LI Yuan, YOU Bin, HE Chengqi[J].Chinese Journal of Inorganic Analytical Chemistry,2021,11(5):97-101.