Photometric Determination of Dissolved Oxygen in Water with the Reaction of Iodine and Starch
摘 要
根据碘与淀粉反应生成蓝色络合物以及此络合物在574 nm波长处有吸收峰,提出了水样中溶解氧的光度测定法.为固定样品中的溶解氧,于碱性介质中加入硫酸锰与之形成三氧化二锰沉淀物.测定时加入硫酸使与沉淀物反应而释出所固定的氧,并立即与同时由溶液中已加入的碘化钾与硫酸反应而释出碘而使溶液中呈现蓝色.用光度法在574 nm波长处测得其吸光度.从由碘酸钾标准溶液作为溶解氧标准所制作的标准曲线上查得试样中溶解氧的含量,对显色的条件作了系统试验并选定了优化的反应条件,溶解氧的质量浓度在0.027~0.80 mg·L-1之间符合比耳定律.取3种不同来源的水样按此方法测定其溶解氧含量,所得结果与碘量法及溶解氧测定仪所测得的结果相符.
Abstract
Based on the reaction between iodine and starch to give a blue colored complex with its absorption maximum at the wavelength of 574 nm,a photometric method for determination of dissolved oxygen in water was proposed.Dissolved oxygen in the sample was fixed by adding MnSO4 in an alkaline medium to form Mn2O3 from which oxygen was liberated upon addition of H2SO4,and reacted with the free I2 liberated by the reaction of KI with H2SO4.Absorbance of the blue color produced was measured photometrically at 574 nm,and content of dissolved oxygen was found from the standard curve prepared by using KIO3 standard solution as standard for dissolved oxygen.Conditions of the color reaction were studied and optimized.Beer′s law was kept in the range of 0.027-0.80 mg·L-1 of dissolved oxygen.In analyzing 3 different water samples,results obtained by this method were in consistency with the results obtained by iodometry and by the dissolved-oxygen determinator.
中图分类号 O657.32
所属栏目 工作简报
基金项目 江苏省高校自然科学研究计划资助项目(No.05KJB150003)、江苏省海洋生物技术重点建设实验室基金资助项目(No.2005HS010)和全国化工高等教育科学研究“十一五”规划立项课题;淮海工学院自然科学研究课题资助项目(No.Z2007045)
收稿日期 2008/2/25
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备注沙鸥(1979-),女,江苏扬州人,讲师,硕士,研究方向为环境监测分析、分析化学的教学与研究.
引用该论文: SHA Ou,MA Wei-xing,QIAN Bao-hua,CAO Lei,GUO Yan. Photometric Determination of Dissolved Oxygen in Water with the Reaction of Iodine and Starch[J]. Physical Testing and Chemical Analysis part B:Chemical Analysis, 2009, 45(4): 448~450
沙鸥,马卫兴,钱保华,曹磊,郭研. 碘-淀粉光度法测定水中溶解氧含量[J]. 理化检验-化学分册, 2009, 45(4): 448~450
被引情况:
【1】沙鸥,顾凤,徐国想,郭妍,马卫兴, "光度法测定环境水样中溶解氧",理化检验-化学分册 47, 1348-1350(2011)
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参考文献
【1】张世仙,陈文兴.碘量法测定遵义凤凰山山泉水的溶解氧[J].遵义师范学院学报,2006,8(4):59-60.
【2】王琪,袁翠,李雪华,等.碘量法测定水中溶解氧有关问题的探讨及改进[J].干旱环境监测,2006,20(3):181-183.
【3】金中华,陈飞.碘量法测定地表水溶解氧的改进[J].中国环境监测,1992,8(5):47-48.
【4】陈炜庆.覆膜电极溶解氧测定仪示值误差的探讨[J].中国测试技术,2006,32(5):72-73.
【5】陈晓湘,杨广利.分光光度法测定水中溶解氧[J].环境监测管理与技术,1997,9(1):33.
【6】陈浩,苏杭,李庆,等.水中溶解氧的测定[J].分析科学学报,2005,21(2):215-216.
【7】袁东,付大友,张新申,等.溶解氧的测定方法研究进展[J].皮革科学与工程,2006,16(3):42-46.
【8】陈浩,苏杭,李庆,等.水中溶解氧的微量滴定[J].理化检验-化学分册,2006,42(3):169-170.
【9】荆淼,李文龙,于振花,等.光学溶解氧分析仪研究[J].现代科学仪器,2006,5:57-59.
【10】陈春华.海口湾的溶解氧及海水水质指标限制值问题[J].海洋学报,2006,28(2):146-150.
【11】GB 7489-1987水质-溶解氧的测定:碘量法[S].
【2】王琪,袁翠,李雪华,等.碘量法测定水中溶解氧有关问题的探讨及改进[J].干旱环境监测,2006,20(3):181-183.
【3】金中华,陈飞.碘量法测定地表水溶解氧的改进[J].中国环境监测,1992,8(5):47-48.
【4】陈炜庆.覆膜电极溶解氧测定仪示值误差的探讨[J].中国测试技术,2006,32(5):72-73.
【5】陈晓湘,杨广利.分光光度法测定水中溶解氧[J].环境监测管理与技术,1997,9(1):33.
【6】陈浩,苏杭,李庆,等.水中溶解氧的测定[J].分析科学学报,2005,21(2):215-216.
【7】袁东,付大友,张新申,等.溶解氧的测定方法研究进展[J].皮革科学与工程,2006,16(3):42-46.
【8】陈浩,苏杭,李庆,等.水中溶解氧的微量滴定[J].理化检验-化学分册,2006,42(3):169-170.
【9】荆淼,李文龙,于振花,等.光学溶解氧分析仪研究[J].现代科学仪器,2006,5:57-59.
【10】陈春华.海口湾的溶解氧及海水水质指标限制值问题[J].海洋学报,2006,28(2):146-150.
【11】GB 7489-1987水质-溶解氧的测定:碘量法[S].
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