被动采样器在采样过程中空白污染来源的确认及控制

Verification and control of blank contamination sources of passive samplers in passive sampling

在博物馆微环境污染气体被动采样过程中,常出现被动采样器空白值高及易被污染的问题。针对这些问题,研究者对被动采样整个环节中涉及的进样瓶、提取瓶以及采样器各部件单元进行了空白分析,同时考察了不同制样环境、不同提取环境、不同温度烘干的滤纸对采样器空白值的影响,最终明确了采样器中不同污染离子的来源,提出了控制方案,优化了制样方法,有效降低了整体空白值,出现污染的概率从30%左右降低至5%,为博物馆污染气体采样分析提供了可靠的技术支持。

In the process of passive sampling of pollution gases in the microenvironment of museums,passive samplers often have high blank values and are easily contaminated.In order to solve these problems,we carried out blank analyses on sample bottles,extraction bottles and other components of samplers involved.Also,we investigated the influences of different sample preparation and extraction environments,as well as filter papers dried at different temperatures,on the blank values of samplers.Finally,the sources of different contamination ions in the sampler were identified,the control scheme was put forward and the method of sample preparation was optimized.The overall blank value was effectively reduced and the probability of contamination was reduced from about 30%to 5%.The study provides reliable technical support for the methodology of sampling and analysis of pollution gases in museums.