The Turbidity and pH Impact Analysis of Low Concentration Water Chemical Oxygen Demand Ultraviolet Absorption Detection
WU Guo-qing, BI Wei-hong*, FU Guang-wei, LI Jian-guo, JI Hong-yue
1. School of Information Science and Engineering, Yanshan University, Qinhuangdao 066004, China 2. The Key Laboratory for Special Fiber and Fiber Sensor of Hebei Province, Qinhuangdao 066004, China
Abstract：Configuration standard solution in the concentration range of 1~25 mg·L-1 of potassium hydrogen phthalate was usded as experimental subject, Ultraviolet absorption spectra was collected, the COD quantitative analysis model was established by partial least squares with different pretreatment methods and the turbidity of the compensation effect analysis was given. The results show the model uses smoothing first derivative pretreatment method, internal cross validation RMSECV root mean square value of 0.122 27, principal component number 4, the square of the prediction model correlation coefficient is 0.999 8, and the relative prediction error is in the range of 0.03%~1.7%; for 0~100 NTU’s turbidity solution, the relative standard deviation RSD is 2.3% after compensation; with pH in the range of 3~10, influence can be ignored.
Key words：COD;UV absorbance;Quantitative analysis model;Tubidity;pH value
吴国庆，毕卫红*，付广伟，李建国，纪红月 . 低浓度水质化学需氧量紫外吸光检测中浊度与pH影响分析 [J]. 光谱学与光谱分析, 2013, 33(11): 3079-3082.
WU Guo-qing, BI Wei-hong*, FU Guang-wei, LI Jian-guo, JI Hong-yue . The Turbidity and pH Impact Analysis of Low Concentration Water Chemical Oxygen Demand Ultraviolet Absorption Detection . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2013, 33(11): 3079-3082.
