No abstract

Cadmium is an important poisonous metal, which often enriches in soils and stream sediments. While the content of cadmium reaches a definite level, it will harm human health. This paper uses contribution factor and enrichment factor to research on the sources of high Cd-value belt in Yichang section of the Yangtze River. As the result showed that: (1) The strata in the study area made a different contribution to the high Cd-value belt, which from big to small is the Sinian system, the Permian system, the Triassic system, the Cambrian system, the Silurian system, the Devonian system ， the Pre-Sinian system , the Ordovician system , the Jurassic system and the Cretaceous system. (2) Comprehensive study by contribution factor, enrichment factor and MAPGIS spatial analyses, the major natural sources were from the process of weathering and draining of the Sinian system, the Permian system, the Triassic system, which are enriched of mine and cadmium.