摘要:
实验设备、耗材等物品以及实验室环境中都有可能存在一定浓度的多环芳烃,造成样品在前处理过程中可能受到污染,从而影响多环芳烃测定结果的准确性。文章系统地研究了水样分析中萘、苊、芴、菲、蒽等多环芳烃污染物的引入和去除方法。在排除了数据处理和仪器测试的原因后,确认污染来自于样品前处理过程。对容器污染、试剂干扰、前处理间环境污染和氮吹浓缩系统等因素的排查结果表明,氮吹浓缩系统是主要的污染源。进一步实验证实,氮气、减压阀以及连接管线等均可造成多环芳烃污染。通过采取更换氮气、减压阀和连接管线的措施,并将氮气通过活性炭柱,能够有效地去除这些污染。实验设计了装有活性炭的玻璃柱装置,可以有效去除存在的萘等多环芳烃物质的污染;但专用减压阀避免多环芳烃污染的效果验证、氮气中多环芳烃污染物的来源确认以及多环芳烃污染去除装置的优化改进等问题还有待于进一步研究。
关键词:
-
多环芳烃
/
-
前处理
/
-
水样
/
-
污染来源
/
-
去除方法
Abstract:
Polycyclic aromatic hydrocarbons (PAHs) existed in equipments, and materials, which would indicate that the lab environment is a potential source of contamination during the pretreatment of samples and consequently affects the accurate analysis of PAHs. A systematic study was undertaken on the sources of naphthalene, acenaphthene, fluorene, phenanthrene and anthracene contaminants during PAHs analysis in water, and a way to remove them successfully. The process of pretreatment was confirmed by the source of some contaminants after excluding uncertainties from data processing and instrument measurement. After examining glass containers, solvents, and the nitrogen condensation system separately, the nitrogen condensation system was found to be the primary source of contaminants. Further investigation confirmed that the nitrogen gas, reductor and pipe used to conduct the nitrogen could contaminate the sample. Finally, these contaminants can be removed by treating the nitrogen gas with an active carbon column after replacing the nitrogen gas, reductor and pipe.
下载:
京公网安备 11010202008159号