[Accumulation of Heavy Metals in Agricultural Soils and Crops from an Area with a High Geochemical Background of Cadmium, Southwestern China].

In order to investigate the accumulation and transfer of heavy metals in agricultural soils and crops in an area with a high geochemical background of cadmium, soil and crop samples from a black shale outcropped area in Chongqing were collected and analyzed, and the results were then compared with those from other representative black shale outcropped areas. The results showed that some soil samples had a very low pH, and the metals Cd, Cr, Ni, and Zn were enriched. Cadmium concentrations in soil samples exceeded the safety limit, followed by Cr and Ni.

[Spatial Distribution, Sources and Bioavailability of Heavy Metals in the Surface Sediments of Longjiang River, Southern China].

In order to evaluate the pollution status, possible sources, and bioavailability of heavy metals (As, Cd, Pb, Sb, Zn, and Tl), 33 surface sediments were collected from Longjiang River, Southern China. The total concentrations and potential bioavailable concentrations of the heavy metals were analyzed using ICP-MS. Enrichment factors (EFs), Pearson correlation analysis, and principal component analysis (PCA) were used to further assess their pollution degree and potential sources.

[Spatial Distribution Characteristics and Potential Ecological Risk of Antimony and Selected Heavy Metals in Sediments of Duliujiang River].

In order to investigate the spatial distribution characteristics of Sb and selected heavy metals, and to discriminate their sources and potential ecological risks in surface sediments of the Duliujiang river,a total of 62 surface sediment samples were collected in this study. Total contents of Sb, As, Cd, Co, Cr, Cu, Mo, Ni, Pb, Tl, Zn and Fe in these samples were measured by inductively coupled plasma mass spectrometry(ICP-MS) and the inductive plasma optical emission spectrometry(ICP-OES). Principal component analysis(PCA) and Pearson correlation analysis were used to deduce the potential sources of these elements.

[Cadmium and selected heavy metals in soils of Jianping area in Wushan County, the Three Gorges region: distribution and source recognition].

Abnormally high cadmium (Cd) concentrations were existed in soils of Jianping area in the Three Gorges region, but little information is available about the geochemical distribution of Cd and source identification. In the present paper, total contents of Cd and other selected heavy metal elements, the characteristics of soil, the contents of Cd in typical soil profiles, and chemical forms of Cd in selected soils were studied. The correlation analysis, the principal component analysis, and the comparison between different soil types were conducted.

[Geochemical distribution and environmental quality of cadmium in river sediment around the Jinding Pb-Zn mine area in Yunnan].

A long-term mining activity of Jinding Pb-Zn mine area in Yunnan has caused the serious cadmium pollution to the river sediments of the ambient area. The Cd contents of Beidagou river sediments (mean value <10 mg x kg(-1)) are lower than those of Nandagou river sediments (mean value = 266 mg x kg(-1)). The Cd contents of river sediments in different section of Bijiang river occur distinct difference.