鄭仙玨,沈建東*,何曦 ,華道柱,許凱兒,張海洋,鐘琪,楊凱,葉華俊
(1.杭州市環境監測中心站,浙江 杭州 310007;2.聚光科技股份有限公司,浙江 杭州 310052;3.中國環境監測總站,北京 100012)
多通道PM2.5采樣器的設計及與進口采樣器比對測試
鄭仙玨1,沈建東1*,何曦1,華道柱2,許凱兒1,張海洋1,鐘琪3,楊凱3,葉華俊2
(1.杭州市環境監測中心站,浙江 杭州 310007;2.聚光科技股份有限公司,浙江 杭州 310052;3.中國環境監測總站,北京 100012)
設計了多通道大氣顆粒物采樣器,可同時采集4個通道的PM2.5樣品,靈活配置采樣通道的開啟,每個通道單獨設置質量流量計,采用閉環反饋技術,通過比例閥、流量傳感器及流量控制板共同控制和校正采樣流量,保證通道流量的穩定性。與單通道采樣器(BGI PQ 200)進行了為期30 d的比對測試,結果表明,多通道采樣器斜率、截距和相關系數均符合《環境空氣顆粒物(PM10和PM2.5)采樣器技術要求及檢測方法》(HJ 93—2013)的要求,可滿足實際應用需求。
多通道大氣顆粒物采樣器;設計;比對測試
Abstract: The self- designed multi- channel atmospheric particulate sampler can collect PM2.5with four channels simultaneously, and the working of sampling channel can be configured according with the requirements. A mass flow meter is employed in each channel. The closed loop feedback technology is used to ensure the stability of channel flow rate. To assure the stability of flow, the flow rate of the sample is accurately controlled and corrected by proportional valve, flow sensor and flow controlling panel. A comparison test was being carried out for 30 days between self- designed multi- channel sampler and single channel sampler (BGI PQ 200). The results reveal that the slope, intercept and correlation coefficients conform to the requirements of “The ambient air particulate matter (PM10and PM2.5) sampler technical requirements and test methods” (HJ 93—2013). The self- designed multi- channel sampler can meet the application requirements.
Keywords: Multi- Channel atmospheric particulate sampler;Design;Comparing test
大氣顆粒物(PM) 是指分散在空氣中的空氣動力學當量直徑(dp)為0.001~100 μm 的固體或液體微粒[1-3]。其對空氣質量和人體健康均會造成嚴重危害[4-5],特別是dp≤2.5 μm的細顆粒物(PM2.5)可沉積于小氣道與肺泡中,對人體危害更大[6]。PM2.5來源廣泛且化學成分復雜,主要包括含碳組分、水溶性離子以及無機元素,其中既有性質穩定的組分,也有半揮發性成分。細顆粒物中絕大多數元素和硫酸鹽均很穩定,不存在特殊的采樣問題,而半揮發性組分在顆粒態與氣態之間的分配平衡則可能在采樣過程中受到影響而引起顆粒態物質的揮發和(或)氣態物質的吸附,并因此導致采樣誤差[7]。……