| 摘要: |
| 为研究南宁市土壤中正构烷烃的赋存情况以及来源，于2021年6月在南宁市内采集了48个土壤样品，采用气相色谱-质谱法（GC-MS）对表层土壤中正构烷烃的质量分数进行了测定。结果表明，正构烷烃碳链长度范围为C12—C35，∑24正构烷烃的质量分数为3.93~131.02 μg/g，其中C31质量分数最高，C22以上的高碳正构烷烃具有明显的奇偶优势，体现了典型的高等植物来源的特点。碳优势指数等参数分析结果表明，土壤中的正构烷烃主要来自陆地高等植物且总体上木本植物>草本植物，少部分可能存在石油污染。主成分分析（PCA）结果表明，C29—C35具有同源性，主要受植物叶蜡影响（41.36%），C24和C25主要来自水生植物（27.88%），C16和C18可能是细菌和石油化合物排放共同影响的结果（21.49%）。根据主成分分析中样品的贡献权重得出，可能存在石油化合物输入的土壤63.6%来自耕地，27.3%来自林地，9.1%来自园地，研究区土壤中正构烷烃的主要人为排放源可能受到农业机械排放以及靠近道路周边受交通排放的影响。 |
| 关键词: 正构烷烃 表层土壤 分布特征 来源解析 主成分分析 |
| DOI： |
| 分类号:X53 |
| 基金项目: |
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| Analysis of the Pollution Characteristics and Sources of N alkanes in Soil of Nanning City |
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WU Lieshan， LI Guangying， ZHONG Minjie， HUANG Ning， LI Qingqianet al1,2
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1.School of Resources， Environment and Materials， Guangxi University， Nanning，Guangxi 530004， China;2.Guangxi Zhuang Autonomous Region Ecological and Environmental Monitoring Centre， Nanning， Guangxi 530028， China
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| Abstract: |
| To study the occurrence and sources of n alkanes in soils in Nanning， 48 soil samples were collected within Nanning in June 2021， and the n alkane content in surface soils was determined by gas chromatography mass spectrometry (GC-MS)， and the distribution characteristics and sources of n alkanes were analyzed in detail The results showed that the carbon chains of n alkanes ranged from C12 to C35， and the mass fractions of ∑24 n alkanes ranged from 3.93 to 131.02 μg/g， among which C31 had the highest mass fraction， and the high carbon n alkanes above C22 had obvious odd even dominance， reflecting the characteristics of typical higher plant sources The results of carbon dominance index and other parameters showed that the n alkanes in the soil mainly came from terrestrial higher plants and generally woody plants > herbaceous plants， with a small portion of possible petroleum contamination The results of principal component analysis (PCA) showed that C29 to C35 were homologous and mainly influenced by plant leaf wax (41.36%)， C24 and C25 were mainly from aquatic plants (27.88%)， and C16 and C18 were probably the result of the combined effect of bacterial and petroleum compound emissions (21.49%) Based on the contribution weights of the samples in the PCA， it was concluded that 63.6% of the samples with possible petroleum compound inputs were from cultivated land， 273% from forest land and 9.1% from garden land， and the main anthropogenic sources of n alkanes in the soils of the study area could be influenced by emissions from agricultural machinery and by traffic emissions near the road perimeter. |
| Key words: N-alkanes Surface soil Distribution characteristics Source analysis Principal component analysis |
