多元线性回归-分光光度法测定电镀排放废水中重金属

作者	单位
李瑞月	桂林电子科技大学生命与环境科学学院, 广西桂林 541004
钟山	桂林电子科技大学生命与环境科学学院, 广西桂林 541004
张漓杉	桂林电子科技大学生命与环境科学学院, 广西桂林 541004
韦锃弦	桂林电子科技大学生命与环境科学学院, 广西桂林 541004
肖巍	桂林云璟科技有限公司, 广西桂林 541004
李昆明*	广西壮族自治区生态环境监测中心, 广西南宁 530022

通讯作者:李昆明* 广西壮族自治区生态环境监测中心, 广西南宁 530022

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中文摘要:

采用多元线性回归-分光光度法进行电镀排放废水中Cr³⁺、Ni²⁺、Zn²⁺的同时测定研究。以4-（2-吡啶偶氮）间苯二酚（PAR）为显色剂，探索了同时测定模拟电镀废水中Cr³⁺、Ni²⁺、Zn²⁺的实验方法，建立多元线性回归模型。根据实际电镀排放废水中Cr³⁺、Ni²⁺、Zn²⁺的质量浓度分布调查结果，设计了测定较低和较高浓度范围2种模型，分别对应不同水质波动程度的电镀企业废水，前者浓度范围设置基本覆盖大多数实际电镀排放废水中Cr³⁺、Ni²⁺、Zn²⁺的浓度，且具有较高精度。测定浓度范围较小模型对应水质波动较小的电镀排放废水，模型中Cr³⁺、Ni²⁺、Zn²⁺的质量浓度分别为0.32~0.44、0.32~0.50、0.72~0.84 mg/L，平均相对误差MRE为5.14%~6.68%；测定浓度范围较大模型对应水质波动较大的电镀排放废水，模型中Cr³⁺、Ni²⁺、Zn²⁺的质量浓度分别为0.20~1.00、0.10~0.70、0.30~1.50 mg/L，MRE为6.44%~9.91%。2种模型可按电镀企业不同类型排放废水测定需求进行选择。该方法对实际电镀排放废水中Cr³⁺、Ni²⁺、Zn²⁺的含量进行分析测定结果与原子吸收分光光度法基本相近，RE在±6%范围内，变异系数均小于5.301%。

英文摘要:

Simultaneous determination of Cr³⁺,Ni²⁺ and Zn²⁺ in electroplating discharge wastewater using multiple linear regression-spectrophotometry was studied in this paper.An experimental method for the simultaneous determination of Cr³⁺,Ni²⁺ and Zn²⁺ in simulated electroplating wastewater was explored using 4-(2-Pyridyl Azo) Resorcinol (PAR) as a colour developer and a multiple linear regression model was developed.Based on the results of the mass concentration distribution of Cr³⁺,Ni²⁺ and Zn²⁺in actual electroplating discharge wastewater,two models were designed to determine smaller and larger concentration ranges,corresponding to different degrees of water quality fluctuations in electroplating enterprise wastewater,and the former concentration range setting basically covered the concentrations of Cr³⁺,Ni²⁺ and Zn²⁺ in most actual electroplating discharge wastewater with high accuracy.The model with a smaller concentration range corresponded to electroplating discharge wastewater with less fluctuation in water quality,and the mass concentrations of Cr³⁺,Ni²⁺ and Zn²⁺ in the model were 0.32-0.44,0.32-0.50 and 0.72-0.84 mg/L,respectively,and the MRE was 5.14%-6.68%.The model with a larger concentration range corresponded to electroplating discharge wastewater with high fluctuation in water quality,and the mass concentrations of Cr³⁺,Ni²⁺ and Zn²⁺ ranged from 0.20 to 1.00,0.10 to 0.70 and 0.30 to 1.50 mg/L,respectively,and the MRE was 6.44% to 9.91%.The two models can be selected according to the needs of different types of discharge wastewater determination in electroplating enterprises.The analytical results of the method for the determination of Cr³⁺,Ni²⁺ and Zn²⁺ in actual electroplating discharge wastewater were basically similar to those of the atomic absorption spectrophotometric method,with RE within ±6% and the coefficient of variation less than 5.301%.

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