Journal
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
Volume 22, Issue 7, Pages 4932-4941Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-014-3892-6
Keywords
Cd concentration; Arable soil; China
Categories
Funding
- National Natural Science Foundation of China [41271190]
- State Scholarship Fund of China [20120832013, 201208320127]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
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Cadmium (Cd) concentration in arable soil has drawn broad public attention due to its direct effect on Cd concentration in food. However, there have been few studies of surveying Cd accumulation on the national scale in China. This paper collected 486 studies of Cd concentrations in Chinese arable soil. The results showed that the average Cd concentration was 0.27 mg/kg, higher than its background value, indicating that Cd had been introduced into arable soil by human activity. The Cd concentrations in areas of mining and smelting, urban areas, and areas irrigated by wastewater were obviously higher than that in remote areas. Spatially, Cd concentrations were lower in the north than those in the south, and many hotspots existed throughout China due to mining and smelting activities. Most Cd in the arable soil were accumulated from external sources in all investigated provinces except Ningxia Hui Autonomous Region.
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