| With the rapid development of the industrial age,oil and its products have become an indispensable part of human daily life.However,due to the production and processing of petroleum products,the inevitable production of petroleum pollutants into the atmosphere,water and soil,and the ultimate soil becomes the most important petroleum pollutant in the environment.Hui.This paper selects the sewage irrigation area of Urumqi Urumqi petrochemical plant,which has a long history of irrigation and large irrigation area,that is,the sewage irrigation area of Urumqi petrochemical plant,Urumqi,which has great influence on the environment,high content and toxicity,and selected the total soil in the soil of the sewage irrigation area.Petroleum hydrocarbons,n-alkanes and polycyclic aromatic hydrocarbons(PAHs)are the characteristic compounds representing petroleum pollution.The analysis methods of total petroleum hydrocarbons in soil are discussed.The qualitative and quantitative analysis of the characteristic pollutants is carried out,and their distribution characteristics and sources are analyzed.In order to provide technical guidance and theoretical support for the control and remediation of oil pollution in oily sewage and sewage irrigation area.The main conclusions are as follows:(1)refer to the current EPA recommended and petroleum hydrocarbon detection in China's water environmental standards,through the analysis of optimal conditions for establishment method of petroleum hydrocarbon in soil experiments: using accelerated solvent extraction,extraction temperature 100,circulating extraction 4 times,nitrogen blowing 45 s,extraction agent of acetone / dichloromethane composite the solvent method is simple,fast,has high recovery rate,accurate,good repeatability.(2)the study area sewage irrigation TPH content of oil caused by salt contaminated soil was 120.01~578.32 mg/kg,significantly higher than the control group(P<0.05),the difference in irrigated areas of petroleum hydrocarbons content significantly,the overall soil irrigation area of oil pollution degree belongs to moderate pollution;0~40cm in the section is the main accumulation layer of petroleum hydrocarbon,and the soil composition,such as clay content and organic matter,are the main factors affecting the distribution of pollutants in the profile.(3)Sewage irrigation area soil is the change range of alkane content is 2.74 ~ 8.84mg/kg,the surface soil samples are the change range of alkane content is 4.30 ~ 8.84mg/kg,in the moderate pollution level compared with other areas at home and abroad.The sources of n-alkanes in the soil are mixed sources,including fossil fuel incomplete combustion,vehicle exhaust emission,irrigation and strong terrigenous higher plant input.are related to sewage irrigated farmland.(4)All soil samples from 0-100 cm in Urumqi sewage irrigation area were contaminated by PAHs.The total contents of 16 PAHs in surface soil ranged from 237.3-2028.6ug/kg to 911 ug/kg.There is a negative correlation between the content of PAHs in the section and the depth of soil.The two kinds of monomers with the highest content in the soil of the sewage irrigation area are Phe and Nap.In the surface soil,the PAHs content of the woodland is higher than that of the cultivated land and the wasteland,and the 2-3 ring of the low ring is the most important component.The characteristic ratio and total index method based on the project that petrochemical sewage irrigation is the main contribution of polycyclic aromatic hydrocarbons in the soil,in addition to vehicle emissions and biomass incomplete combustion source input to a certain extent also affected the distribution of PAHs in soil. |
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