不同光程下化学需氧量的光谱吸收特性  

Spectral absorption characteristics of chemical oxygen demand under different optical paths

作　　者：黄明柱 姚灵 王欣欣 林佳迪 陈莹莹 HUANG Mingzhu;YAO Ling;WANG Xinxin;LIN Jiadi;CHEN Yingying(Ningbo Water Meter(Group)Co.,Ltd.,Ningbo 315032,China;College of Control Science and Engineering,Zhejiang University,Hangzhou 310027,China)

机构地区：[1]宁波水表(集团)股份有限公司,浙江宁波315032 [2]浙江大学控制科学与工程学院,杭州310027

出　　处：《化学分析计量》2023年第4期73-77,共5页Chemical Analysis And Meterage

摘　　要：利用超短光程比色皿,结合超高灵敏度紫外可见分光光度计、高性能光谱仪,在室温下暗室环境中研究了化学需氧量的紫外吸收光谱,并基于溶液在紫外波段的光谱吸收特性进行分析建模。使得光谱法测定化学需氧量的线性范围扩展到4 000 mg/L。一元鲁棒线性回归模型拟合结果显示,其相关系数r达到0.999 7。该研究扩大了光谱分析技术研究化学需氧量浓度的范围,为高浓度溶液的光学研究、高量程光谱水质在线监测仪器研发,提供了可行性实验依据和理论支撑。The ultraviolet absorption spectrum of chemical oxygen demand researched was studied in the dark room environment at room temperature by using ultra-low path cuvette with ultra-high sensitivity ultraviolet visible spectrophotometer and high-performance spectrometer.The analytical modeling was carried out based on the optical absorption characteristics of the solution in the ultraviolet band.The linear range of chemical oxygen demand(COD)measured by spectrometry was extended to 4000 mg/L.And the fitting result of univariate robust linear regression model showed that the correlation coefficient r reached 0.9997.This study improves the range of COD concentration by spectral analysis technology,and provided a feasible experimental basis and theoretical support for the optical research of high concentration soluble substances and the development of high-range spectral water quality online monitoring instruments.

关 键 词：化学需氧量 光谱吸收 光程 浓度 

分 类 号：O657[理学—分析化学]