摘要
对于TSP(总悬浮颗粒物,空气动力学当量直径不大于100μm的颗粒物)样品,采用大流量采样器(采样膜为TSP石英膜,膜面积为414 cm^(2))以1.05 m^(3)·min^(-1)流量采集24 h。对于PM_(2.5)(空气动力学当量直径不大于2.5μm的颗粒物)样品,采用小流量采样器(采样膜为PM_(2.5)石英膜,膜面积为12.56 cm^(2))以16.67 L·min^(-1)流量采集24 h。取出采样膜,截取11.5 cm^(2)TSP采样膜和全部PM2.5采样膜,加入去离子水至50 mL。振荡后超声80 min,振荡,用0.45μm针头过滤器过滤,前5 mL滤液弃去,收集续滤液置于总有机碳(TOC)分析试样瓶中,用锡纸封口,采用TOC分析仪测定总碳(TC)和无机碳(IC)的含量,利用差减法计算水溶性有机碳(WSOC)的含量。结果显示,TC和IC的质量浓度分别在28.0 mg·L^(-1)和8.0 mg·L^(-1)以内与吸光度呈线性关系,差减法所得WSOC的检出限(3.143 s)为0.12 mg·L^(-1);按标准加入法进行回收试验,回收率为90.0%~118%,测定值的相对标准偏差(n=7)为2.8%。方法用于北京市某城市点位2019年1月至2019年12月301份PM2.5样品的分析,WSOC的检出质量浓度为0.51~23.79μg·m^(-3)。
TSP(total suspended particulate matter with aerodynamic equivalent diameter not exceeding 100μm)samples were collected using the high flow sampler(the TSP quartz film as the sampling membrane with the membrane area of 414 cm^(2))at a flow rate of 1.05 m^(3)·min^(-1)for 24 h.PM_(2.5)(particulate matter with aerodynamic equivalent diameter not exceeding 2.5μm)samples were collected using the low flow sampler(the PM_(2.5)quartz film as the sampling membrane with the membrane area of 12.56 cm^(2))at a flow rate of 16.67 L·min^(-1)for 24 h.The TSP sampling membrane with usable area of 11.5 cm^(2) or the whole PM_(2.5)sampling membrane was taken,and deionized water was added to 50 mL.The mixture was shaken and sonicated for 80 min.After shaking,the mixture was passed through a 0.45μm needle filter,and the first 5 mL of filtrate was discarded.The subsequent filtrate was collected,and placed into a total organic carbon(TOC)analysis sample bottle.After sealing with tin foil,total carbon(TC)and inorganic carbon(IC)were determined by the TOC analyzer,and water soluble organic carbon(WSOC)was determined by subtraction method.It was shown that linear relationships between values of the mass concentration and the absorbance of TC and IC were kept within 28.0 mg·L^(-1)and 8.0 mg·L^(-1),and detection limit(3.143 s)of WSOC obtained by subtraction method was 0.12 mg·L^(-1).Test for recovery was conducted by the standard addition method,giving results in the range of 90.0%-118%,and RSD(n=7)of the determined values was 2.8%.The proposed method was applied to the analysis of 301 PM_(2.5)samples from a certain city site in Beijing from January 2019 to December 2019,with detected mass concentrations in the range of 0.51-23.79μg·m^(-3)for WSOC.
作者
姜洋
周健楠
吴敏
刘兆莹
常淼
JIANG Yang;ZHOU Jiannan;WU Min;LIU Zhaoying;CHANG Miao(Beijing Municipal Ecological and Environmental Monitoring Center,Beijing 100048,China)
出处
《理化检验（化学分册）》
CAS
CSCD
北大核心
2024年第2期206-210,共5页
Physical Testing and Chemical Analysis(Part B:Chemical Analysis)
关键词
燃烧氧化
非分散红外吸收光谱法
大气颗粒物
水溶性有机碳
combustion oxidation
non-dispersive infrared absorption spectrometry
atmospheric particulate matter
watersolubleorganic Carbon
