滤膜对环境空气中砷测定的影响及改进

Influence of Filter Membrane on Determination of Arsenic in Ambient Air and Its Improvement

依据《环境空气和废气颗粒物中砷、硒、铋、锑的测定原子荧光法》(HJ 1133—2020)的要求,对采集环境空气中砷的9种滤膜的本底值、回收率、检出限、精密度和准确度进行了实验对比。根据实验各项性能指标及成本考虑,建议选择尼龙、硝酸纤维或混合纤维3种国产有机滤膜,其购买方便、价格较低,方法检出限均为0.2 ng/m^(3),精密度和准确度均能满足环境空气中砷的测定要求。

According to the requirements of“Ambient air and waste gas-Determination of arsenic,selenium,bismuth,antimony in ambient particle matter-Atomic fluoresscene spectrometry”(HJ 1133—2020),nine different kinds of filter membranes which were used to collect arsenic in ambient air were compared with each other from their background values,recoveries,detection limits,precision and accuracy.Taking the performance and cost into consideration,the domestic filter membrane made from nylon,nitratecellulose or mixed fiber were recommended.These domestic products are easily purchased with lower price,and their detection limits are 0.2 ng/m^(3),precision and accuracy can meet the requirement set by the standard method.