泸州环境空气自动监测PM_(2.5)和PM_(10)质量浓度“倒挂”现象及原因分析  

Analysis on Reversal Phenomenon and Cause of Automatic Monitoring of PM_(2.5)and PM_(10)Mass Concentrations in the Ambient Air in Luzhou

作　　者：薛京洲 王旭阳 李小宇 XUE Jingzhou;WANG Xuyang;LI Xiaoyu(Luzhou Ecological Environment Monitoring Center Station,Luzhou Sichuan 616000,China)

机构地区：[1]四川省泸州生态环境监测中心站,四川泸州646000

出　　处：《新疆环境保护》2024年第2期26-30,共5页Environmental Protection of Xinjiang

摘　　要：选取2022年泸州市4个国控点PM_(10)、PM_(2.5)以及温湿度数据,分析不同月份、不同颗粒物浓度范围、不同温湿度下的PM_(2.5)和PM_(10)质量浓度的“倒挂”现象。结果表明:4个国控点均存在PM_(2.5)和PM_(10)浓度“倒挂”现象,其中小市上码头国控点1—2月小时值连续出现“倒挂”,这种现象与监测设备系统误差、温湿度等因素均有关,更与PM_(2.5)仪器动态加热系统异常和维护不到位有关。这种异常“倒挂”很难在巡检和质控时发现,但可以通过点位间数据对比间接判断,从而及时维修或更换监测备机。纳溪区环保局国控点日均值未出现“倒挂”,但小时值“倒挂”率高达9.3%,应重点关注动态加热系统运行状况、加强日常巡检维护和采样流量校准以减轻低浓度时的系统误差影响。Based on the the data of PM_(10),PM_(2.5),temperature and humidity from four national control points in Luzhou City in 2022,the Reversal phenomenon of PM_(2.5)and PM_(10)mass concentrations in different months,different particle concentration ranges,and different temperatures and humidity was analyzed.The results showed that there were Reversal phenomenons of PM_(2.5)and PM_(10)concentrations in all four national control points.Among them,the hourly values of the national control point at the Xiaoshishangmatou continuously had appeared Reversal from January to February.This phenomenon was related to the system error of the monitoring equipment and the factors such as temperature and humidity,and was also related to the abnormality of the PM_(2.5)instrument's dynamic heating system and inadequate maintenance.This abnormal Reversal was difficult to find during inspections and quality control,but it can be indirectly judged through data comparison between points.So the monitoring backup machine can be repaired or replaced in time.The daily average value of the national control point of the Naxi District Environmental Protection Bureau has not appeared Reversal,but the Reversal rate of hourly value was as high as 9.3%.The operating status of the dynamic heating system,daily inspection and maintenance and sample flow calibration should been focused to mitigate the effects of system errors at low concentrations.

关 键 词：PM_(2.5) PM_(10) “倒挂”现象 环境空气自动监测 

分 类 号：X831[环境科学与工程—环境工程]