分光光度法水质中游离氯和总氯的分析测定
关键词：游离氯；总氯；N,N-二乙基-1,4-苯二胺分光光度法
Water quality - Determination of free chlorine and total chlorine
Abstract:Establishing an accurate, rapid and effective chlorine standard monitoring method,can ensure that the monitoring data is true and effective. And it also has the vital significance for the monitoring and evaluation of water quality ,security of drinking water , human health and ecological security.The experiment used spectrophotometric method to research the determination of free chlorine and total chlorine in water quality.In this experiment, we established a method for the determination of using N, N-diethyl-1, 4-phenylenediamine.Because of the standard solution of free chloride is unstable and difficult to obtain,in this experiment, I uesd molecular iodine instead of free chlorine to finish the calibration curves.The method we established for potassium iodate has good linear relation in the range of 0.00~2.00mg/L,and the precision is less than 2%,which could be used in the research of determination of free chlorine and total chlorine in water.The results show that the relative average deviation of free chlorine and total chlorine content are both less than 2% respectively.These results provide a basis for water quality monitoring and control of water pollution.
KeyWords:free chlorine;total chlorine;N, N-diethyl-1, 4-phenylenediamine
目录
1 引言 4
1.1 论文的目的和意义 4
1.2 国内外研究现状、水平和发展趋势 4
1.2.1 水游离氯和总氯的基本理化性质 4
1.2.2 现行游离氯和总氯分析方法标准的局限性 5
1.2.3 游离氯和总氯分析方法的最新进展 6
1.2.4 主要国家、地区及国际组织相关分析方法研究 8
1.2.5 国内相关分析方法研究 9
1.3 本论文拟解决的问题 9
2 游离氯和总氯的测定 10
2.1 概述 10
2.2 仪器和试剂 10
2.2.1 仪器 10
2.2.2 材料和试剂 10
2.3 实验方法 12
2.3.1 游离氯的测定 12
2.3.2 总氯的测定 12
2.4 干扰和消除 12
2.4.1 其它氯化合物的干扰 12
2.4.2 其它氧化物的干扰 12
2.5 结果和讨论 12
2.5.1 标准曲线的绘制 12
2.5.2 重复性 13
2.5.3 DPD显色剂的用量 14
2.5.4 反应时间 15
2.5.5 吸收波长 15
2.5.6 缓冲溶液的PH值 16