Based on the data of volatile organic compounds (VOCs) collected continuously in the Nanjing industrial area, the VOCs temporal variability, photochemical reactivity, differences in tracer ratios, and source apportion...
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Based on the data of volatile organic compounds (VOCs) collected continuously in the Nanjing industrial area, the VOCs temporal variability, photochemical reactivity, differences in tracer ratios, and source apportionment by principal component analysis/absolute principal component scores (PCA/APCS) were *** results showed that the total VOC concentration was 43.5 ppbv, which was 45.1% alkanes, 25.3% alkenes,7.3% alkynes and 22.3% *** was an obvious seasonal variation in the of VOCs, with a maximum in summer and minimum in winter, as well as in the VOC components, with alkanes and alkynes highest in winter,alkenes highest in summer, and aromatics highest in *** VOCs exhibited significant diurnal variations, *** at night and low during the *** concentrations of night time VOCs were highest to lowest as follows:summer>autumn>spring>*** contrast, the concentrations of daytime VOCs were highest to lowest as follows: winter>summer>spring>*** diurnal variation of the VOCs was the largest in autumn and the smallest in *** largest diurnal variation of alkanes and alkenes occurred in autumn, whereas the largest diurnal variation of aromatics and alkynes occurred in *** the propylene-equivalent method, alkenes had the highest concentration, followed by aromatics and *** ratios of T/B, E/B and X/B were 1.2, 1.0 and 0.8, respectively, possibly due to the aging air *** on the specific pollutant ratio method, the observation site was greatly affected by the surrounding industrial *** source analysis of the VOCs in the PCA/APCS mode showed that the sources consisted of industrial production sources, automobile emission sources, combustion sources, industrial production volatilization sources, solvent use sources and biogenic emission sources;in addition, there were seasonal ***, the sources related to industrial production activities accounted for 45-63% of the VOCs, followed by a
To understand pollution characteristics of chemical composition, the particles samples were collected by two Andersen cascade impactors in Nanjing northern suburb during May to July in *** components of PM2.1 reported...
To understand pollution characteristics of chemical composition, the particles samples were collected by two Andersen cascade impactors in Nanjing northern suburb during May to July in *** components of PM2.1 reported as ionic compositions, carbon species and metallic *** PM2.1 samples were analyzed for its chemical compositions (Na, Mg, Al, K, Ca, V, Cr, Mn, Fe, Zn, Mo, Cd, Ba, Pb, Na+, NH4+, K+, Mg2+, Ca2+, Cl-,NO3-, SO42-, OC and EC).The SO42-, NH4+ and NO3-were the mainly ionic species, accounting for 78.54% in total ions mass in *** concentration of OC ranged between 5.14 and 26.98μg·m-3, with an average of 13.04μg·m-3, while EC between 0.80 and 7.46, with an average of 2.61μg·***, Na, Fe and K dominated the collected elements in PM2.1 in summer, accounting for 70.17% of total elemental mass, Cr, A1, Mg, Zn and V accounted for 27.53% of total elemental mass, the other elements insufficiently accounted for 3% of total elemental *** positive matrix factorization version 3 (EPA-PMF 3.0) was applied to identify the source contribution of PM2.1 concentrations at the study *** categories were determined based on chemical component abundances in source ***, results indicated that seven factors were obtained, indentified as (Ⅰ) secondary aerosol characterized by high concentrations of NH4+, NO3" and SO42-, accounting for 20.22%;(Ⅱ) metallurgical aerosol characterized by high concentrations of Pb, Cd and Zn, accounting for 6.71%;(Ⅲ) road dust characterized by high concentrations of Mg, Ca, Na, Al and Ba, accounting for 11.85%;(Ⅳ) biomass burning characterized by high concentrations of K+, Na+, Cl-and K, accounting for 10.17%;(Ⅴ) residual oil characterized by high concentrations of V and Cr, accounting for 16.63%;(Ⅵ) iron and steel industry characterized by high concentrations of Mn and Fe, accounting for 9.48%;(Ⅶ) Vehicle Exhaust characterized by high concentrations of OC, Mo, EC and K, accounting for 24.94%.
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