Hu Yonggang, Yang Zeyu
Institute of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, PR China.
Talanta. 2004 Jun 17;63(3):521-6. doi: 10.1016/j.talanta.2003.11.037.
In this paper, a low cost chemiluminescence detector with a photodiode instead of photo-multiplier tube (PMT) was developed for environmental monitoring of water quality. Based on the chemiluminescent reaction of luminol-H(2)O(2)-Cr(3+) system, light emission caused by luminol-H(2)O(2)-Cr(3+) system was detected by the photodiode, and its intensity caused by the appearance of Cr(3+) after samples digestion was proportional to the chemical oxygen demand (COD). Effects for COD determining such as pH, concentrations, interference, and digestion procedures were investigated. The experimental results show that this suggested method uses an instrument that is simpler and cheaper than the previous ones used for the same purpose. The data obtained by the present method were fairly in good agreement with those obtained by the standard reflux titrimetric method. It has been applied to determine real samples with satisfactory results.
本文研制了一种采用光电二极管而非光电倍增管（PMT）的低成本化学发光检测器，用于水质环境监测。基于鲁米诺-H₂O₂-Cr³⁺体系的化学发光反应，用光电二极管检测鲁米诺-H₂O₂-Cr³⁺体系产生的发光，样品消解后Cr³⁺出现所引起的发光强度与化学需氧量（COD）成正比。研究了pH值、浓度、干扰和消解程序等对COD测定的影响。实验结果表明，该方法所用仪器比以往用于相同目的的仪器更简单、更便宜。本方法获得的数据与标准回流滴定法获得的数据相当吻合。该方法已应用于实际样品测定，结果令人满意。
