水中三卤甲烷含量测定的方法研究

论文编号:ZY117    论文字数:11231,页数:27

摘 要:采用吹扫-捕集/气相色谱/电子捕获检测联用技术（P&T-GC/ECD）快速分析生活饮用水中多组分的微量三卤甲烷。对吹扫时间、解吸温度、解吸时间等吹扫-捕集条件进行优化，对分析方法的选择性、精密度、准确度、加标回收率进行验证，并对实际水样实测分析。本方法操作简单、省时，具有较高的灵敏度、准确度、精密度和较广的分析范围，方法的线性范围为10.0-100.0μg/L,相关系数在0.9987-0.9992之间，一溴二氯甲烷、二溴一氯甲烷、三溴甲烷三种物质的检出限分别为1.759μg/L、1.138μg/L 、2.400μg/L。相对标准偏差均小于５％,加标回收率在97%-12%之间。结果表明本方法适用于饮用水中三卤甲烷的分析。
关键词: 吹扫—捕集；气相色谱；电子捕获检测器；三卤甲烷；水

Abstract: The method of purge and trap in combination with gas chromatographic/electron capture detection was established for the rapid determination of multi-component trace trihalomethane in drinking water simultaneously. The experimental conditions of P&T, such as Purge time, desorption temperature, desorption time were optimized. In addition , the selectivity, precision, accuracy and recovery of this analysis method were validated. The method is simple, time-saving, with high sensitivity, accuracy, precision and a wide linear range. The linear ranges were between 10.0-100.0μg/L, the correlation coefficients were between the 0.9987-0.9992. The detection limits of bromodichloromethane, dibromochloromethane, bromoform were 1.759μg/L, 1.138μg/L, 2.400μg/L respectively. The relative standard deviations(RSD) were less than 5%. The average recoveries of the method were between 97%-112%. The results showed that the method was suitable for trace analysis of THMs in drinking water.
Key word: Purge and Trap; Gas chromatography; ECD; THMs(Trihalomethane); Water

目   录

中文摘要 I
英文摘要 II
目录 III
1. 绪论 1
 1.1 水污染概况 1
 1.2 国内外对挥发性有机物研究状况 1 
 1.3 本实验任务 2
2. 仪器与试剂 3
 2.1 仪器  3
 2.2 试剂 3
3. 实验部分 4
 3.1 方法装置与过程   4
 3.2 操作步骤 4
 3.2.1 纯水的制备 4
 3.2.2 配制标准系列 4
 3.2.3 进样操作 5
 3.2.4 吹扫捕集条件的确定 5
 3.2.5 方法的选择性 6
 3.2.6 方法检出限与测定限的确定 6
 3.2.7 工作曲线制作 6
 3.2.8 方法精密度的测定 7
 3.2.9 方法准确度的测定 7
 3.2.10 水样采集和保存 7
 3.2.11 加标回收率的测定 7
 3.2.12 实际样品的测定 7
4. 结果分析与讨论 8
 4.1 吹扫捕集条件的确定   8
 4.2 方法的选择性   9
 4.3 方法检出限与定量范围  10
 4.4 标准曲线的制作  11
 4.5 方法的精密度   14
 4.6 方法的准确度   15
 4.7 加标回收率的测定   16
 4.8 实际样品的测定   18
5. 结论 20

致谢 21
参考文献 22