| 重铬酸钾褪色法和硫酸铬显色法直接测定COD_Cr |
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| 引用本文： | 方新红,兰生富,吴欣,曹佳红.重铬酸钾褪色法和硫酸铬显色法直接测定COD_Cr[J].四川环境,2009,28(3):23-27. |
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| 作者姓名： | 方新红 兰生富 吴欣 曹佳红 |
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| 作者单位： | 成都市城市排水监测站,成都,610063 |
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| 摘 要： | 建立了重铬酸钾褪色法和硫酸铬显色法直接比色测定CODcr的方法，重铬酸钾褪色法测定范围10-700mg／L，检出限7.0mg／L，三次平行测定CODcr值为417mg／L样品，标准差为2.6mg／L，回收率为96.6％；硫酸铬显色法的测定范围30-1200mg／L，检出限为23.0mg／L，三次平行测定CODcr值为987mg／L，标准差为22.3mg／L，回收率为96.3％，两种方法都优于HJ／T399-2007推荐的方法。
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| 关 键 词： | 重铬酸钾褪色法 硫酸铬显色法 |
Direct Determination of CODCr by K2Cr2O7 Depigmentation and Cr2(SO4)3 Spectrophotomety |
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| FANG Xin-hong,LAN Sheng-fu,WU Xin,CAO Jia-hong.Direct Determination of CODCr by K2Cr2O7 Depigmentation and Cr2(SO4)3 Spectrophotomety[J].Sichuan Environment,2009,28(3):23-27. |
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| Authors: | FANG Xin-hong LAN Sheng-fu WU Xin CAO Jia-hong |
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| Institution: | (Chengdu Municipal Drainage Monitoring Centre, Chengdu 610063, China) |
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| Abstract: | Two methods, i.e. , K2Cr2O7 depigrnentation and Cr2（SO4）3 spectrophotomety for direct determination of CODcr were established. For K2Cr2O7 depigmentation, measuring range were 10- 700mg/L with detection limit of 7.0 mg/L. The three-time paral/cl determination value was 417 mg/L with standard deviation of 2.6mg/L and recovery of 96.6% . For Cr2（SO4）3 spectrophotomety, the measuring range were 30-1200mg/L with detection limit of 23.0mg/L. The three-time parallel determination value was 987 mg/L with standard deviation of 2.6mg/L and recovery of 96.3%. Both the two methods were superior to the standard method from HJ/T399 -2007. |
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| Keywords: | K2Cr2O7 depigmentation Cr2 （ SO4 ） 3 speetrophotomety |
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