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Impacts of different sampling fibers on the determination of the acidity of atmospheric particulates
Author(s): LI Li, YIN Renli, YU Haiyang, ZHAO Min, FU Shaomiao, JING Zihui, CHEN Yahao, DENG Shihuai College of Resources and Environmental Sciences, Sichuan Agricultural University, Chengdu 611130
Pages: 2210-
2215
Year: 2012
Issue:
9
Journal: Acta Scientiae Circumstantiae
Keyword: 玻璃膜; 石英膜; Teflon膜; 复合纤维素酯滤膜; 大气颗粒物; 酸性;
Abstract: 颗粒物特别是酸性细粒子对人体呼吸系统具有毒性效应,且颗粒物呈酸性还会加速许多气溶胶二次组分的形成,从而影响环境和气候.因此,本文在美国环保署(EPA)制定的颗粒物酸性标准测定方法的基础上,分别采用玻璃膜、石英膜、Teflon膜和复合纤维素酯滤膜(MCE膜)在实验室中进行平行提取测定,探讨各种膜对颗粒物酸性测定的影响,确定不同条件下加入H+量与提取H+量之间的标准曲线,评价不同采样膜对颗粒物酸性测定的准确性与精密度.结果显示,Teflon膜、MCE膜、石英膜、玻璃膜用于颗粒物酸性测定,其测定的精密度和准确性分别为9.4%和7.8%、9.9%和13.0%、15.6%和18.1%、17.8%和16.1%.玻璃膜用于H+的数据测定时,由于其标准曲线的斜率变化范围大(0.745~1.048),基质碱性物质背景值高,导致测定的潜在误差最大.
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