光学溶解氧传感器和Winkler法测定溶解氧的对比研究
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摘要
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。
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.
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.
引文
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[2]KEELING R F,GARCIA H E. The change in oceanic O2inventory associated with recent global warming[J]. Proceedings of the National Academy of Sciences of the United States of America,2002,99(12):7848-7853.
[3]McNEIL C L,D'ASARO E A. A calibration equation for oxygen optodes based on physical properties of the sensing foil[J].Limnology&Oceanography:Methods,2014,12:139-154.
[4]傅家乐.荧光淬灭法溶解氧测定仪校准方法的研究[J].化学分析计量,2014,23(1):83-85.
[5]UCHIDA H,KAWANO T,KANEKO I,et al. In situ calibration of optode-based oxygen sensors[J]. Journal of Atmospheric&Oceanic Technology,2008,25(12):2271-2281.
[6]李伟,陈曦,庄峙厦,等.基于荧光猝灭原理的光纤化学传感器在线监测水中溶解氧[J].北京大学学报(自然科学版),2001,37(2):226-230.
[7]郑旻辉,潘建明,杨俊毅,等.荧光猝灭法溶解氧传感器实验室校准方法研究[J].海洋技术学报,2016,35(1):62-67.
[8]祝陈坚.海水分析化学实验[M].青岛:中国海洋大学出版社,2006:23-26.
[9]WANG X D,WOLFBEIS O S. Optical methods for sensing and imaging oxygen:Materials,spectroscopies andapplications[J].Chemical Society Reviews,2014,43(10):3666-3761.
[10]张涛.海洋原位溶解氧检测仪设计与开发[D].杭州:浙江大学,2013.
[11]中华人民共和国国家质量监督检验检验总局,中国国家标准化管理委员会. GB 17378. 7—2007海洋监测规范第4部分海水分析[S].北京:中国标准出版社,2007.
[12]杨帅,孙亚伟,杨幸幸,等.荧光法测定海水溶解氧的可靠性分析[C]//2014年度上海市海洋湖沼学会年会暨学术年会论文集.上海:上海市海洋湖沼学会,2015.
[13]GRASSHOFF K,KREMLING K,EHRHARDT M. Methods of Seawater Analysis[M]. 3rd ed. Weinheim,GER:WILEY-VCH Verlag Gmbh,1999.
[14]HELM I,JALUKSE L,LEITO I. A highly accurate method for determination of dissolved oxygen:Gravimetric Winkler method[J]. Analytica Chimica Acta,2012,741:21-31.