黄河不同区段悬浮颗粒物中正构烷烃的组成及物源

Sources and Spatial Trends of n-Alkanes in Suspended Particulate Matter in the Huanghe River

研究黄河流域正构烷烃的迁移、转化。2003年10月在黄河兰州附近的新城至山东的利津设站，系统地研究了黄河悬浮颗粒物中正构烷烃的组成特征、来源和空间分布变化。结果表明：黄河悬浮颗粒物中正构烷烃的总浓度基本分布在1．29-7．56μg／L之间。碳数分布特征为：上游以单峰型为主；中、下游区域分布为双峰型。说明上游悬浮颗粒物中正构烷烃主要是受陆源影响，中游和下游正构烷烃除主要受陆源影响之外，具有明显的水生生物源的特征，水生生物源正构烷烃的变化规律与陆源明显不同。

The spatial distribution and sources of particulate n-alkanes in the Huanghe River were studied. Suspended particulate samples were collected from Xincheng station to Lijin station in October 2003. Total nalkanes concentrations in the suspended particulate samples from the Huanghe River ranged from 1.29μg/L to 7.56μg/L. The results showed that a unimodal distribution of particulate n-alkanes in the upper stream, and a bimodal distribution in the middle stream and downriver, which suggested the particulate n-alkanes in the Huanghe River mainly came from terrigenous inputs, and partly from aquatic matter which had higher concentrations in the middle streams and downriver than in the upper streams. The distributions of the aquatic origin and the terrigenous inputs seemed quite different.