Aliphatic and Polyaromatic Hydrocarbons in Snow/Ice and Glacier Meltwater in the Qiyi Glacier, Qilian Mountains:Sources and Distribution
Snow, glacier meltwater and glacier bottom ice were collected from the Qiyi Glacier, Qilian Mountains, in June 2008, of which n-alkanes (nC14～nC32) and PAHs were analyzed by GC～ MS, after being enrichment by resin. The results showed that the content of n-alkanes in glacier meltwater was the highest, followed by that of snow and that of glacier bottom ice. While the PAHs content in snow was the highest, followed by that of glacial meltwater and that of bottom ice. Due to the high hydrophobicity, n-alkanes and pol-ycyclic aromatic hydrocarbons tend to remain in the residual solid phase in the solid-liquid distribution processes. As the glacier meltwater is taken about one kilometer away from the glacier terminus, the surface soil and vegetation in both sides of the drainage route will contribute n-alkanes to the water sample partly. Therefore, the content of n-alkanes in glacier meltwater would be the highest. In contrast to n-alkanes, volatile PAHs may be emitted to atmosphere or sorpted by soil and vegetation during snowmelt, resulting in low content of poly-cyclic aromatic hydrocarbons. The contents of n-alkanes and PAHs in glacier bottom ice were all low, which may be due to the aged glacier bottom ice and light pollution from human activity. The CPI values further indicated that n-alkanes in this study were derived from plant waxes and fossil-fuel combustion products. The ratios of Phenanthrene/ Anthracene and Fluoranthene/Pyrene can be used as a method to identify the major source of PAHs, coal combustion and vehicle pollution.
Qiyi Glacier, snow and ice, glacier meltwater, n-alkanes, PAHs
NETL
NSTL
万方数据
维普
