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| 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 |
| Received:January 22, 2021 Revised:June 30, 2021 |
| View Full Text View/Add Comment Download reader |
| DOI：10.3969/j.issn.2095-1035.2021.05.017 |
| KeyWord:high-chlorine; surface water; chemical oxygen; blow-Acidizing -Dichromate method |
| Author | Institution |
| shiyuge |
新疆维吾尔自治区生态环境监测总站 |
| shiyuge |
新疆维吾尔自治区生态环境监测总站 |
| DA Lifang |
新疆维吾尔自治区生态环境监测总站 |
| DUAN Xiaoyan |
新疆维吾尔自治区生态环境监测总站 |
| LI Gang |
新疆维吾尔自治区生态环境监测总站 |
| LI Yuan |
新疆维吾尔自治区生态环境监测总站 |
| YOU Bin |
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| HE Chengqi |
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| 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. |
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