P-5L型光散射数字测尘仪的应用研究

Application of P - 5L2 light scattering digital conimeter

[目的]P-5L_2型光散射数字测尘仪克服了滤膜称重法操作繁琐、噪声大、仪器笨重等缺点,具有快速、灵敏、稳定性好、体积小,能现场直读测定结果等优点,适用于公共场所卫生监测工作,但光散射测尘仪测定结果是每立米的粒子数(cpm),与我国现行卫生标准规定的质量浓度(mg/m^3)不相适应,通过P-5L_2型光散射数字测尘仪的应用研究,为制定国家卫生标准提供依据,并可为当地监测计算出更为合理的转换系数(K)值。[方法]同时用P-5L_2型光散射数字测尘仪和滤膜称重法对常州地区四类公共场所分四季进行监测,取得数据。[结果]结果表明质量浓度与相对浓度明显相关(R=0.7787,P<0.001),相对浓度和质量浓度的转换系数(K)呈近似正态分布,K值均不随公共场所行业类型、季节以及是否使用空调的改变而改变,因而监测结果稳定。[结论]表明采用P-5L_2型光散射数字测尘仪替代滤膜称重法在公共场所空气可吸入颗粒物监测是可行的,鉴于地区间K值存在差异,故仪器使用前宜测定当地的K值。

[Purpose]P- 5L2 light scattering digital conimeter overcomes some shortcomings of filter membrane method, such as over-laborate operation, large noises and heavy equipment. It is fast , sensitive, steady and small. It can show result directly, and can be applied to hygienic monitoring work in public places. However, unite of determination result by light scattering conimeter (cpm) doesn' t suit quality concentration (mg/m3) fixed in China. Study on P - 5L2 light scattering digital conimeter can provide basis for setting national hygienic standards, and provide more reasonable transformation coefficient (K) for local monitoring. [Method]4 kinds of public places in Changzhou were monitored in 4 seasons by P - 5L2 light scattering digital conimeter and by filter membrane method simultaneously , and data were collected. [Result]It was showed quality concentration and relative concentration were correlated apparently ( R = 0.7787, P < 0.001), K distributed normally and didn't affected by kinds of public places, seasons and air conditioners, so monitoring result was steady.[Conclusion]It is feasible to monitor inspiratory paniculate matter in public places by P- 5L2 light scattering digital conimeter instead of filter membrane method. In view of differences of K in different areas, K should be determined before application of conimeter.