ELPI 测定环境空气 PM2．5的现场比对研究

采用ELPI自动监测方法与手工采样－重量法对环境空气PM2．5监测进行现场比对研究，按照两种方法数据的相对偏差来评价ELPI方法的数据质量。实验结果表明，两种方法数据的相对偏差范围为－12．9％～17．4％，加权平均值为3．0％；相对偏差的绝对值范围为1．1％～17．4％，平均值为9．3％。 ELPI法的数据质量总体较好，方法的准确度尚可。只是随着空气PM2．5浓度测定值的升高，ELPI法与重量法相对偏差的绝对值显著减小，可见，在低浓度下，ELPI法的数据质量相对较差，此时方法的准确度有待进一步验证、提高。

Contrast Study on Ambient Air PM 2 .5 Monitoring by ELPI

Contrast study on ambient air PM2.5 monitoring was conducted, automatic monitoring results were compared with manual monitoring results, and the data quality was evaluated by the relative deviation(RD).Results shows that the RD ranged from-12.9% to 17.4%,3.0%in weighted average;ranged from 1.1%to 17.4%, 9.3%in average.The data quality of ELPI method was generally good, and the accuracy of this method is acceptable.As the air PM2.5 concentrations raised, the significant-ly reduced, so the results also shows that the data quality was relatively bad at low PM2.5 concentration, and the accuracy of this method needs to be validated and improved in this case .