title: [Comparison of Monitoring Methods of Organic Carbon and Element Carbon in Atmospheric Fine Particles].
abstract: Accurate measurement of organic carbon (OC) and elemental carbon (EC) in atmospheric fine particulate is an important scientific basis for studying the formation and source apportionment of carbonaceous aerosol. The selection of different analysis programs will lead to difference in the OC and EC concentrations, and further result in the misjudgment of the results. The OC and EC concentrations observed using three temperature protocols including RT-Quartz ( R) , NIOSH 5040 (N) and Fast-TC (F) were compared and analyzed in combination with the degree of air pollution in Beijing. The results showed that there was no significant difference in the TC (TC = OC + EC), OC and EC concentrations observed using R, N and F protocols and certain deviation was found among the TC (TC = OC + EC) , OC and EC concentrations. For TC, the results observed using R protocol were 5% lower than those using N protocol; hut 1% higher than those using F protocol. For OC, the results obtained using R were 9% lower than those using N protocol and 1% higher than those using F protocol. For EC, the results obtained using R were 20% higher than those using N protocol and 11% lower than those using F protocol. The variation coefficients for TC, OC and EC obtained based on R protocol were less than the other two temperature protocols under different air quality degrees. The slopes of regression curves of TC, OC and EC between on-line analysis using R protocol and off-line analysis were 1.21,1. 14 and 1.35, respectively. The correlation coefficients of TC, OC and EC were 0.99, 0.99 and 0.98, respectively. In contrast with the Black carbon ( BC) concentrations monitored by multi-angle absorption spectrophotometer (MAAP), the EC concentrations measured by on-line OC/EC analyzer using R protocol were obviously lower. When the BC concentrations were less than or equal to 8 gg*m3, the EC/BC ratio was 0.39. While the EC/BC ratio was 0.88, when the BC concentrations were greater than 8 ggm3. The variation trends of EC and BC concentrations were similar, while systematic error existed between the results obtained using those two instruments.
authors.forename: Bo
authors.initials: B
authors.lastname: Pang
authors.forename: Dong-sheng
authors.initials: DS
authors.lastname: Ji
authors.forename: Zi-rui
authors.initials: ZR
authors.lastname: Liu
authors.forename: Bin
authors.initials: B
authors.lastname: Zhu
authors.forename: Yue-si
authors.initials: YS
authors.lastname: Wang
mesh_terms: D000336:Aerosols / Q000032:analysis; D000393:Air Pollutants / Q000032:analysis*; D001272:Atmosphere / Q000032:analysis; D000068476:Beijing; D002244:Carbon / Q000032:analysis*; D004784:Environmental Monitoring; D053260:Soot / Q000032:analysis; D013696:Temperature
chemical_list: D000336:Aerosols; D000393:Air Pollutants; D053260:Soot; D002244:Carbon