By Guodong Zhang, Shengguo Cheng
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Extra info for Advances in Environmental Engineering: Selected, Peer Reviewed Papers from the 2012 Global Conference on Civil, Structural and Environmental ... International
Nitrate (NO3–-N) and ammonium (NH4+-N) were extracted with 2 M KCl and determined by an AA3 AutoAnalyzer (BRAN+LVEBBE, Norderstedt, Germany). 5 or with 1 M NH4OAc at pH 7. Free-living N2-fixation rate (FNR) was determined using the acetylene (C2H2) reduction . 5 g fresh soil using the FastDNA®SPIN Kit for Soil (MP Biomedicals, USA) according to the manufacture’s protocol and was stored at -20 °C before further analysis. The community structures of the functional groups were analyzed by the polymerase chain reaction-denaturing gradient gel electrophoresis (PCR-DGGE).
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. 400 350 300 1st stage 2nd stage 3rd stage 4th stage 5th stage 250 200 150 100 50 0 Jan Feb A pr M ay M onth Fig. 69µm) are much higher than the other stages each month, especially in January.
They change the form of heavy metals in particulate matter, affect the migration process, significantly increase the intensity of acid rain under certain conditions as their strong acidity[6~10]. Therefore they have high research values. Fatty acids are the main components of organic acids in atmospheric particulate matter, their mass concentration account for about 60% of detected organic acids. The reasearches have shown that vehicle emissions, fuel combustion and cooking are the main sources of fatty acids which their carbon numbers are no more than twenty-one (≤C20).
Advances in Environmental Engineering: Selected, Peer Reviewed Papers from the 2012 Global Conference on Civil, Structural and Environmental ... International by Guodong Zhang, Shengguo Cheng