Abstract:Carbon isotopic composition of organic carbon (OC), elemental carbon (EC) and total carbon (TC) in PM10 and major emission sources (coal combustion dust, vehicle exhaust dust and soil dust) were studies by off-line step-heating oxidation and isotope mass spectrometry detecting. Then the emission sources of carbon in Taiyuan were discussed based on its carbon isotopic compositions. As the results shown, the carbon isotopic values of OC, EC and TC (δ13COC, δ13CEC and δ13CTC) in PM10 in Taiyuan were 34.7‰, -23.5‰, -23.9‰ in winter and -30.5‰, -23.1‰, -23.9‰ in spring, respectively. And δ13COC, δ13CEC and δ13CTC were -26.5‰, -23.2‰ and -23.6‰ in coal dust, -24.6‰, -14.1‰ and -17.3‰ in soil dust, 27.7‰, -25.5‰ and -27.0‰ in gasoline car exhaust dust and -25.7‰, -24.3‰ and -24.8‰ in diesel exhaust dust, respectively. Generally, EC and TC were used for the indicator of carbons emitted from the soil dust, and TC for the gasoline exhaust dust. Based on the binary complex formula, OC and EC accounted for 30% and 70% of TC in the soil dust, 11% and 89% in coal combustion dust, 78% and 22% in gasoline vehicle exhaust dust, 36% and 64% in diesel car exhaust dust, respectively. TC and EC in PM10 in Taiyuan were mainly from coal combustion dust. Besides vehicle exhaust dust, OC might be emitted by other important sources.
张建强, 王莹, 彭林, 白慧玲, 牟玲, 刘效峰, 宋翀芳. 太原市PM10及其污染源中碳的同位素组成[J]. 中国环境科学, 2012, 32(6): 968-972.
ZHANG Jian-Qiang, WANG Ying, PENG Lin, BAI Hui-Ling, MOU Ling, LIU Xiao-Feng, SONG Chong-Fang. Isotopic compositions of carbon in PM10 and its emission sources in Taiyuan. CHINA ENVIRONMENTAL SCIENCECE, 2012, 32(6): 968-972.