光学溶解氧传感器和Winkler法测定溶解氧的对比研究

依托实验室搭建的溶解氧对比装置，系统研究了不同温度和溶解氧条件下光学溶解氧传感器和Winkler法测定溶解氧的区别。 结果表明，光学溶解氧传感器和Winkler法测定溶解氧的结果有较好的相关性，在不同温度条件下两者的相关系数均大于0.998。在溶解氧浓度低于4 mg·L^-1时，光学溶解氧传感器测定值略低于Winkler法；在溶解氧浓度大于4 mg·L^-1时，光学溶解氧传感器与Winkler测定差值主要集中在-0.25~0.25 mg·L^-1。两种光学溶解氧传感器测定结果较为接近，差值小于0.10 mg·L^-1。光学溶解氧传感器测定是一种可靠的溶解氧检测方法，可适用于海洋调查和养殖区的常规在线监测。

Comparative study on optical sensors and classical Winkler titration for determination of dissolved oxygen

An experimental comparison device for dissolved oxygen determination has been built in the laboratory to explore the difference between optical method and classical Winkler titration under different temperature and dissolved oxygen concentration conditions. The results show that the correlation between optical sensors and classical Winkler titration is good with correlation coefficient higher than 0.998 at different temperatures. Dissolved oxygen measured by optical sensors is slightly lower than that of classical Winkler titration in the concentration of dissolved oxygen lower than 4 mg·L^-1. The difference values between optical sensors and classical Winkler titration are mainly concentrated in -0.25~0.25 mg·L^-1 when the concentration of dissolved oxygen is higher than 4 mg·L^-1. The results measured by two kinds of optical sensors are close, and the difference is less than 0.10 mg·L^-1. This result proves that optical sensor is a reliable method for detecting dissolved oxygen, which can be applied to marine survey and conventional on-line monitoring in aquaculture areas.