乌鲁木齐某含油废水污灌区土壤中正构烷烃空间分布特征及来源解析

Distribution characteristics and sources analysis of n-alkanes in soils of Urumqi oil-bearing wastewater irrigation area

研究了乌鲁木齐某含油废水污灌区不同土地类型(林地、葵花地、玉米地、荒地)0~100cm的土壤中正构烷烃的分布特征和来源。结果表明,表层(0~20cm)土壤中正构烷烃质量浓度为4.30~8.43mg/kg,呈现林地>玉米地>荒地>葵花地的特点,与国内外其他地区相比受到中等程度的污染。土壤中正构烷烃含量随深度增加整体呈递减趋势。不同土地类型不同土层中正构烷烃种类相似,但不同深度土壤中不同碳原子数的正构烷烃质量分数差异显著(P<0.05)。研究区土壤中正构烷烃来源为混合源,包括化石燃料不完全燃烧和木本植物的释放。

Distribution characteristics and sources of n-alkanes in 0 -100 cm soils of Urumqi oil-bearing waterwater irrigation area were studied,considering different landuse types (forest land,sunflower land,corn field and wasteland). Results showed that the mass concentration of n-alkanes in topsoil (0-20 cm) was 4.30 to 8.43 mg/kg ,which was moderately polluted compared with other regions at home and abroad. The distribution characteristics in different landuse types were forest land>corn land>wasteland>sunflower land. The content of n-alkane decreased with the depth. The kinds of the n-alkanes in different depths of soil with different landuse types were similar,but the components’ mass fraction were significantly different ( P <0.05). The source turned out to be mixed source,including incomplete combustion of the fossil fuel and woody plants release.