| 光谱学与光谱分析 |
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| A Dual-Wavelength Spectroscopic Method for the Low Chemical Oxygen Demand Determination |
| JIANG Ran1, CHAI Xin-sheng2*, ZHANG Cui2, TANG Hong-liang1, 3 |
1. Pearl River Water Resources Institute, Pearl River Water Resources Commission, Guangzhou 510640, China
2. State Key Laboratory of Pulp and Paper Engineering, South China University of Technology，Guangzhou 510640, China
3. School of Civil and Transportation Engineering, South China University of Technology, Guangzhou 510640, China |
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Abstract The present paper reports a dual wavelength spectroscopic method for the determination of chemical oxygen demand(COD) of low content samples, based on the absorption measurement at 440 and 560 nm. Since the absorptivities of Cr3+ at these two wavelengths are the same, a net absorption from dichromate ions can be determined by subtracting the absorption at 560 nm(only contributed by Cr3+) from the absorption at 440 nm. The results showed that the detection limit of quantification is 8.6 mg·L-1 and the relative standard deviations are in the 2%～15% range for the low COD standard samples (≤100 mg·L-1) in this proposed method. Further more, the method does not require calibration based on the standard samples. The present method is simple, reliable, and accurate; it is suitable for the application in a mass testing for low COD samples.
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Received: 2010-09-18
Accepted: 2010-12-10
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Corresponding Authors:
CHAI Xin-sheng
E-mail: xschai@gmail.com
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[1] State Environmental Protection Administration(国家环境保护总局). Monitoring and Analysis Method of Water and Waster Water(Edition 4)(水和废水监测分析方法)(第4版). Beijing：China Environmental Science Press(北京：中国环境科学出版社)，2002. 210.
[2] GB 11914—89. Water Quality-Determination of the Chemical Oxygen Demand-Dichromate Method(水质化学需氧量的测定重铬酸盐法).
[3] Mary Ann H. Franson, et al. Standard Methods for the Examination of Water and Wastewater. 21 Edition, APHA, AWWA, WEF, 2005.
[4] HJ/J399—2007. Water Quality-Determination of the Chemical Oxygen Demand-Fast Digestion Spectrophotometric Method(水质化学需氧量的测定快速消解分光度法).
[5] YANG Xiao-rong(杨孝容). Journal of Wuhan University of Technology(武汉理工大学学报), 2010，32: 177.
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[8] ISO 15705—2002 Water Quality-Determination of the Chemical Oxygen Demand index(ST-COD)-Small-Scale Sealed-Tube Method.
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