重庆市春季大气颗粒物浓度的对比监测分析

通过2012年春季在重庆大气超级站进行的PM10和PM2.5手工采样与自动仪器的对比监测,分析了自动监测与手工监测的一致性及造成偏差的原因,并对PM2.5与PM10浓度的比值关系进行了分析。结果表明:MP101M型颗粒物自动监测仪用于监测PM10时系统性误差偏高,仪器初始精密度存在负偏差;用于监测PM2.5时系统性误差在允许范围之内,仪器初始精密度存在较大负偏差;PM10和PM2.5的手工采样和自动仪器监测值之变化趋势具有非常高的一致性;PM2.5与PM10浓度比值范围在56.5%～90.4%,平均比值为(73.8±7.4)%。

Contrast monitoring analysis of atmospheric particulate matter concentration of Chongqing urban area in spring

Through a contrast monitoring experiment between manual sampling and automatic instrument,data of atmospheric particulate matter(PM₁₀ and PM_2.5)at the atmosphere observation super station of Chongqing in spring of 2012 were obtained.The consistency between automatic monitoring and manual monitoring was made and its deviation was discussed.Then,concentration relation of PM_2.5 and PM₁₀ was analyzed.The results showed that when MP101M automatic particle monitor was used to monitor PM₁₀ concentration,system error was on the high side and negatively initial precision deviation existed.While it was used to monitor PM_2.5 concentration,system error was within the scope of the permit,but much negatively initial precision deviation was showed.The changing trend of PM₁₀ and PM_2.5 data had a very high consistency between manual and automatic monitoring.By manual monitoring,PM_2.5 concentration accounted for 56.5%~90.4% of PM₁₀,average proportion was(73.8±7.4)%.