• 关键词：玻璃膜  石英膜  Teflon膜  复合纤维素酯滤膜  大气颗粒物  酸性

• 基金项目：国家自然科学基金(No.41073101);四川省教育厅青年基金(No.11ZB065);四川农业大学大学生创新实验项目

• 李黎
• 四川农业大学资源环境学院,成都 611130

• 银仁莉
• 四川农业大学资源环境学院,成都 611130

• 余海洋
• 四川农业大学资源环境学院,成都 611130

• 赵敏
• 四川农业大学资源环境学院,成都 611130

• 伏绍淼
• 四川农业大学资源环境学院,成都 611130

• 敬子卉
• 四川农业大学资源环境学院,成都 611130

• 陈亚豪
• 四川农业大学资源环境学院,成都 611130

• 邓仕槐
• 四川农业大学资源环境学院,成都 611130

• 摘要：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.

• Abstract：Evidence has been obtained that aerosols (especially acid aerosols) have adverse effects on respiratory system of human beings. Moreover, acid aerosols can accelerate the formation of high concentration of secondary aerosol components, affecting environment and climate. This work was aimed at evaluating the impact of different sampling membranes on the acidity determination. Based on standard method of U.S. Environmental Protection Agency for the determination of the strong acidity of fine particulates, different membranes, including quartz, glass, Teflon and mixed cellulose ester (MCE) filter fibers, were dropped with strong acid and extracted by KCl-HClO₄-ethanol mixed solution for pH determination. The accuracy and precision of H⁺ determination with different membranes were estimated. In addition, the calibration curve between H⁺ added and H⁺ extracted concentrations for different measurement batches with different kinds of membranes were acquired. Result showed that the precision and accuracy for H⁺ determination extracted by Teflon, MCE, quartz and glass fiber filters were 9.4% and 7.8%, 9.9% and 13.0%, 15.6% and 18.1%, and 17.8% and 16.1%, respectively. It was noted that the slopes of calibration curve varied greatly on glass membranes (from 0.745 to 1.048 in different batches). Background basic matrix was the highest on glass membrane, and the potential determination error of H⁺ was the most notable on glass membrane among the four types of membranes detected.

• Key words：glass fliter  quartz fliter  Teflon fliter  mixed cellulose ester (MCE) fliter  atmospheric particulates  acidity

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