沈阳市主要公园土壤多环芳烃污染特征研究

摘要

Soil samples were collected from 7 major parks in Shenyang in March,2017.The concentrations of 15 Polycyclic Aromatic Hydrocarbons(PAHs)were analyzed with a High-Performance Liquid Chromatography (HPLC)method.Results show that the characteristics of PAHs pollution in the parks are different,that is,the main pollution components are obviously discrepant.The pollution level is the highest in Wanquan Park where the con-centration of PAHs in soil samples is much higher than those in the other sample points.With the increase of soil depth,PAHs concentrations in the studied parks in Shenyang all show a decreasing trend.Analyzing the proportions of PAHs of different ring numbers in soil samples indicates that the content of middle and high ring pollutants is higher and derives from fuel combustion,while the low ring pollutants content is relatively low.Besides,further a-nalysis based on the ratio method shows that the sources of PAHs in Shenyang parks are mainly the high-tempera-ture combustion of fuel,i.e.the mixture of coal,petroleum,and biomass.%在沈阳市选取7个主要公园,于2017年3月采集土壤样品,采用高效液相色谱法对15种美国环保署优控多环芳烃(Polycyclic Aromatic Hydrocarbons,PAHs)的浓度进行分析.结果表明:2017年沈阳市各公园PAHs的污染特征不同,主要污染成分差别明显,其中万泉公园土壤污染水平最高,土样中PAHs浓度远高于其他采样点.由纵向分析发现,沈阳市各公园PAHs浓度随着土壤深度增加呈下降的趋势.由沈阳市各公园土壤样品中PAHs不同环数所占百分比可知,中、高环数污染物组分含量普遍较高而低环数污染物组分含量均较少,表征各公园土壤污染源主要为燃料燃烧.通过比值法进一步分析可知,沈阳市各公园土壤中PAHs来源主要为燃料的高温燃烧,燃烧源主要为煤、石油类、生物质燃烧的混合源.