Abstract
Abstract The heavy-metal contamination in soils has posed a potential threat to safe crop production in China as well as worldwide. It is essential to make a correct evaluation of the contaminated status of soil prior to adopting the special strategies for controlling or alleviating the contamination of crop products. In this study, a large collection of rice and soil samples were taken from diverse locations of Zhejiang, China, and heavy-metal contents were analyzed. The results showed that there was a large difference in heavy-metal contents in soil (diethylene triamine pentaacetic acid [DTPA]-extractable) and in rice grain. Approximately 34.3% of rice samples had cadmium (Cd) levels above the allowable maximum values (AMV) of 0.1 mg/kg and 5.7% had chromium (Cr) levels above the AMV of 1.0 mg/kg. No sample had unsafe levels of nickel (Ni), arsenic (As), copper (Cu), or zinc (Zn). This indicates a major issue for safe rice production with respect to Cd and Cr contamination. Low soil pH leads to an incre...
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