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| Particulates composition characteristics from a bus fueled with different proportions of biodiesel |
| LOU Di-ming, GENG Xiao-yu, TAN Pi-qiang, HU Zhi-yuan, Zhang Yun-hua, SUN Yu-ze |
| School of Automotive Studies, Tongji University, Shanghai 201804, China |
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Abstract Based on a diesel bus certified to China Ⅲemission standards, thecomposition of particulates emission with different proportions of biodiesel was investigated during China city bus cycle (CCBC) on a heavy chassis dynamometer. The results show that soluble organic fraction (SOF) was mainly consists of fatty acid and N-alkanes, while Hopanes and PAHs account for less than 7%. Biodiesel has a significant impact on the compositions, with the proportion of biodiesel going up, EC decreased while OC/EC and SOF increased, C18:2 and C18:1 of fatty acids increased apparently while C12:0 and C14 decreased, N-alkanes and Hopanes components also decreased. The mass of PAHs is concentrated in medium and small molecular with 3 or 4 Benzene rings, while the toxicity of PAHs concentrated in medium and high molecular with more than 4 Benzene rings. When using biodiesel, the mass of PAHs decreased apparently, especially Pyr, FL and PA, while the toxicity changedlittle.
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Received: 23 February 2017
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