| 王文岩,张 娟,王林权,侯 红,李发生,李雪芳.西安城郊土壤中正构烷烃的分布、来源及其影响因素[J].农业环境科学学报,2014,33(4):695-701. |
| 西安城郊土壤中正构烷烃的分布、来源及其影响因素 |
| Distribution, Sources and Affecting Factors of Normal Alkanes in Soils of Xi'an Outskirts |
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| DOI：10.11654/jaes.2014.04.011 |
| 中文关键词: 表层土壤 地下水 正构烷烃 土壤理化性质 来源 |
| 英文关键词: topsoil groundwater n-alkanes soil properties source |
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| 中文摘要: |
| 为了加强西安石油污染防控，并为石油污染物在土壤中的行为研究提供基础数据，利用气相色谱-质谱法对西安市城郊典型蔬菜基地37个表层土壤和37个地下水样品中的正构烷烃进行测定，并对其分布特征、来源及影响因素进行了研究。结果表明：西安城郊土壤中正构烷烃含量在1.06~4.01 μg·g-1之间，以高碳奇数烷烃为主，不同地理区域之间在统计学上无显著差异，地下水中正构烷烃含量在9.2~99.35 μg·L-1之间，与国内外其他地区相比，土壤和地下水存在一定的污染；基于正构烷烃的分子指标的诊断表明，土壤中正构烷烃为混合来源，具有较强的高等植物输入优势，显示出草本植物特征和一定程度的石油污染特征；土壤理化性质与正构烷烃含量的相关性分析表明，土壤中正构烷烃含量与有机质、含水量、碳氮比（C/N）和碳磷比（C/P）呈显著正相关，多元回归分析表明有机质和含水量是主要的影响因子。 |
| 英文摘要: |
| 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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