滤膜-重量法采集低浓度颗粒物的可行性研究

The Feasibility Study of Membrane Filter-weight Method in Low Concentration Particulates

目前我国广泛应用于烟尘测定的方法是使用玻璃纤维滤筒作为采样介质,通过采样前后的滤筒增重来计算烟尘浓度(以下简称滤筒法),而该方法适用于50 mg/m^3以上烟尘浓度的测量,在测量低浓度烟尘时,往往由于滤筒在高温下的失重、在装卸及采样过程中的损耗以及采样过程中的重量损失等原因,会导致11.0~13.2 mg/m^(3[1])的结果误差,这种误差程度已经无法为环境管理提供准确数据。文章针对目前我国尚无低浓度烟尘采样及分析的技术规范,依据国际标准《固定资源排放物-低浓度颗粒物质的质量浓度测定-手工重量分析法》(ISO12141-2002)进行了"低浓度烟尘采样-滤膜法"的适用性监测,通过对滤膜法和传统滤筒法的称重、采样及最终结果的比较,确定两种方法之间的优劣性比较结果。

At present, our country are widely used in the method for the determination of smoke is to use glass fiber filter cartridge as the sampling medium, through the cartridge weight increase before and after sampling to calculate the dust concentration, but this method is applicable to more than 50 mg/m3 of dust concentration measurement, When measuring low concentration of dust, usually because of the weightlessness of the filter tube at high temperature, the loss in the process of loading and unloading, and the weight loss in the sampling process, will lead to 11.0-13.2 mg/m3 result error. The error has been unable to provide accurate data for environmental management. The paper, in view of there is no low concentration of smoke sampling and analyzing the technical specifications at present, In according with the international standard ＂fixed resource Emissions-quality concentration measurement in low concentrations of particulate matter-manual gravimetric method＂ （ISO12141-2002）, conducing the applicability monitoring of ＂low concentration of dust sampling-membrane filter method＂. Through compare the weighing, sampling, and the final result with Membrane filter method and Traditional method of filter cartridge, to determine the merits of the comparison results between the two methods.