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| Distribution, Sources and Affecting Factors of Normal Alkanes in Soils of Xi'an Outskirts |
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| KeyWord:topsoil; groundwater; n-alkanes; soil properties; source |
| Author Name | Affiliation | | WANG Wen-yan | College of Resources and Environmental Science，Northwest A＆F University，Yangling 712100，China
Chinese Research Academy of Environmental Sciences，State Key Laboratory of Environmental Criteria and Risk Assessment, Beijing 100012，China | | ZHANG Juan | Chinese Research Academy of Environmental Sciences，State Key Laboratory of Environmental Criteria and Risk Assessment, Beijing 100012，China | | WANG Lin-quan | College of Resources and Environmental Science，Northwest A＆F University，Yangling 712100，China | | HOU Hong | Chinese Research Academy of Environmental Sciences，State Key Laboratory of Environmental Criteria and Risk Assessment, Beijing 100012，China | | LI Fa-sheng | Chinese Research Academy of Environmental Sciences，State Key Laboratory of Environmental Criteria and Risk Assessment, Beijing 100012，China | | LI Xue-fang | College of Resources and Environmental Science，Northwest A＆F University，Yangling 712100，China |
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| Abstract: |
| Normal（n）-alkanes in the environment may come from uses of petroleum and natural gas. In this study, contents of n-ankanes in thirty-seven topsoil and thirty-seven groundwater samples, collected from typical vegetable fields in the outskirts of Xi′an city, were analyzed using gas chromatograph with mass selective detection（GC/MS）. Total n-alkane concentrations in the soils varied from 1.06 to 4.01 μg·g-1. N-alkanes with odd C number were predominant in most soil samples. No significant differences were found between different areas. Total n-alkane concentrations in the groundwater samples ranged from 9.2 to 99.35 μg·L-1. Compared to other regions, n-alkane concentrations in soil and groundwater were higher in the outskirts of Xi′an city. Sources of n-alkanes in soils of this region were mainly terrestrial higher plants, especially herbaceous plants. There was positive correlation between the concentrations of n-alkanes and soil properties such as organic matter, moisture content, C/N and C/P. Organic matter and moisture content determined the distribution of n-alkanes in soil. |
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