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P—5L_2型光散射数字显示测尘仪克服了滤纸称重法操作繁琐,噪声大,工作时间长等缺点,具有体积小,操作简便,噪声低,稳定性好,可现场直读测定结果等优点,适于我国公共场所的卫生监督监测工作。但是光散射测尘仪测定的结果是每立方米粒子个数(CPM),与我国现行卫生标准规定的质量浓度(mg/m~3)不相适应。因此在公共场所中应用这种仪器时,必须首先求出CPM与mg/m~3的转换系数(K)。为此我们用P—5L~2型测尘仪和滤纸称量法对武汉地区6种公共场所空气中的PM10进行了测定,对两种检测方法进行了差异的显著性检验,求出了武汉地区公共场所空气中PM10质量浓度(mg/m~3)与相对浓度(CMP)的转换系数(K=0.0168),并将武汉地区与北京地区的K值进行了比较,认为地区间的K值有较大的差异,仪器使用前宜测定当地的K值。
P-5L_2 light scattering digital display dust meter to overcome the filter paper weighing method cumbersome operation, noise, long working hours and other shortcomings, with small size, easy operation, low noise, good stability, field direct reading determination results Advantages, suitable for our country public health supervision and monitoring work. However, the result of light scattering dust analyzer is the number of particles per cubic meter (CPM), which is not suitable for the mass concentration (mg / m ~ 3) prescribed by the current health standards in our country. Therefore, when applying this instrument in public places, the conversion factor (K) between CPM and mg / m3 must be found first. To this end, we measured the PM10 in the air of six public places in Wuhan by P-5L ~ 2 dust gauges and filter paper weighed, and made a significant difference test between the two methods. (K = 0.0168) between PM10 mass concentration (mg / m ~ 3) and relative concentration (CMP) in the air of public places in the region, and K values in Wuhan and Beijing were compared, and the K value There is a big difference, the instrument should be used before measuring the local K value.