The article deeply investigates the sampling filter of the heavy metals in ambient air , including selecting membrane from different factories and materials ,comparing the digestion methods ,deter mining equipment and method's detection limit and analyzing the content of the heavy metals in actual sampling filter .Through the deter mination of heavy metals in the 16 kinds of filter of different materials ,the article finds out that microwave digestion has the ad-vantages of complete digestion ,good repeatability and less pollution in contrast with the methods for ultrasonic and e-lectric heating board digestion .Glass fiber filter of W41 had the lowest content of heavy metals and is more suitable to collect the atmospheric particulate matter .When the standard conditions of sampling volume was 150 m3,the detec-tion limits of 18 elements for different glass fiber filters of W 41 by microwave digestion are lower than the standard ( HJ657-2013 ) .The article measures the contents of heavy metals in bac kground point and around factory .The re-sults show that the content of Cu ,Ni,Pb and As are lower than the detection limit of standard ,and the adding standard recovery rate is between 90% and 106%.The elements of Cd,Cr,Zn and Mn are detected around the factory ,but they do not exceed the limit value of emission .%对采集空气中重金属的滤膜作了详细研究,包括不同材质及厂家滤膜的筛选、消解方法的对比、仪器与方法检出限的确定以及实际采样滤膜中重金属含量的测定. 测定了国内外16种不同材质滤膜中重金属的含量,结果发现:相较于超声消解及电热板消解空白滤膜,微波消解法具有消解彻底、重复性好及污染概率小的优点;进口W41牌玻璃纤维滤膜中16种重金属含量均较低,更适合大气颗粒物中重金属的采集;当标况采样体积为150 m3 时,多张W41牌玻璃纤维滤膜经微波消解处理后测得18种元素的方法检出限均低于新标准( HJ657-2013 )给定值;在背景点及工厂附近分别采样测得大气中重金属含量表明:Cu、Ni、Pb、As含量均低于标准中检出限,加标回收率90%~106%,而Cd、Cr、Zn及Mn在工厂附近均有检出,但未超出排放限量值.
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