Geochemical Study On Heavy Metal Contamination Developed In Bed Sediments Of The Xiangjiang River, Hunan Province, China

Xiangjiang River is one of the most serious heavy metal pollution in China river, and there are a variety of heavy metal pollution sources basin: on the one hand, some of the geological body by weathering and supergene processes may become contributors to heavy metal; the other hand, the deposits of River Basin mining and ore smelting, processing and other human activities are strong and have a long history, is also an important source of heavy metal pollution. Different sources of heavy metals through various channels (such as water-soluble transport, atmospheric deposition, etc.) to import the Xiangjiang River and can accumulate in the sediment enrichment to be a potential heavy metal contamination. Theoretically from the different sources of heavy metals and rare earth elements in sediments of different characteristics of the occurrence and geochemical characteristics. Therefore, Occurrence and geochemical characteristics of the different elements in the sediments of the study is an important indicator to determine the sources of these pollutants.Books to study the delta sediments of the Xiangjiang River in the downstream Changsha river and into the lake as the main object of study, the field in two batches in the study area basin system Geological and geochemical surveys, measurement, sampling, and into the lake in the Xiangjiang River Delta Xiangjiang river collected two sediment cores from XY, W, collected in rivers and lakes phase zone sedimentary cores from Q Lakes Nature Reserve to collect sediment cores from the QS, a total of125sediment samples; Xiangjiang River in Changsha section of Xiangjiang River, downstream of river capture four sediment cores from HZ, JZ, SG, XW, a total of186sediment samples. Plasma mass spectrometry (ICP-MS), X-ray diffraction (XRD) analysis techniques, and targeted samples collected from sediments129(6663) of major elements, trace elements (including heavy metals, rare earth elements, etc.) analysis results show that: Xiangjiang River study area watershed sediment weathering is more thorough, sample weathering index (CIA) average more than76. Strong weathering of the sediments show significantly depleted in CaO and Na2O-rich A12O3, Fe2O3and other clay minerals geochemical characteristics.Sediment due to the impact of the River Basin geological bodies weathering and deposit exploitation of combined pollution of ten heavy metals Sc, V and Cr, Mn, Co., Ni and Cu, of Zn and Pb, Th, U, and in the Sanchaji industrial areas and into the lake Triangle region exacerbated the trend. Soil integrated enrichment index (EI) mean more than two, the accumulation characteristics of small size samples by man-made and water environmental factors, disturbance is more obvious. Heavy Metals Pollution Assessment (enrichment factor) results show that the Sc, Mn, Cu, Zn and Pb, and other heavy metals of potential contamination, which is the strongest of the Sc enrichment.Sediment trace element geochemistry of the study area analysis shows that the high field strength element ratios in sediment cores from relatively stable, and REE patterns with the prospective of the Yangtze platform is more similar to granite, indicating that the migration did not occur in the process of moving significantly in the weathering differentiation. And Triangle Regional in the Sanchaji industrial zone and into the lake are relatively enriched in the phenomenon.La-Th-Sc judgment sediments cores JZ, SG, XW, Q and QS may be affected by the combined effect of the natural role and human role. The principal component analysis showed that Eu is similar with Ba, Sc, V, Cr, Mn, Co, Cu, Zn and Pb in the chemical behavior.So that Eu can be used as the Xiangjiang heavy metal enrichment by human activities in the instructions factor. The chemical behavior of U is similar with the rare earth elements, it can be classified as affected by natural role-based elements.