Advances in Environmental Engineering: Selected, Peer by Guodong Zhang, Shengguo Cheng PDF

By Guodong Zhang, Shengguo Cheng

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In addition, mass concentrations of dicarboxylic acid in the third and the fourth stages of particulate matter are slightly higher than in the first and the second stages, but still be significantly lower than in the fifth stage each month. It is clear that dicarboxylic acids are much easier to be absorbed in the fifth particulate matter that one of the stages stands for the PM1, either. The ultrafine particle and the fine particle average mass fractions for dicarboxylic acid are both higher than the fatty acids, they are up to 52% and 73%.

Initial analysis show that total emissions of fuel combustion are large in January and February during the heating period. And emissions of gaseous organic compounds into the atmosphere are easier to be adsorbed by particulate matters and occurred non-homogeneous chemical reactions due to the temperature is lower; Meanwhile, the diffusion and dilution of pollutants are limited because of the low altitudes of the atmospheric mixing layer and much temperature inversions. On the contrary, the emissions of fuel combustion decrease sharply during April and May due to the stopping heating for the higher temperature; Moreover, the concentrations of fatty acids reduce significantly due to the altitudes of atmospheric mixing layer is higher and the particulate matter is easier to be diffused.

In addition, the mass concentrations of oleic acid and linoleic acid are high, either. 2 The compositions and distributions of dicarboxylic acids This research has detected a total of 7 dicarboxylic acids(diC6-diC12 ). 5 and PM1 during experimental period are shown in Table 4. 59 Dicarboxylic acids do not show significant odd-even carbon predominances which are different from the characteristics of compositions and distributions in fatty acids. Nonandioic acid(diC9) presents the highest mass concentrations in dicarboxylic acids of different particle grades.

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