Geochemical characteristics of selenium and cadmium in soil and crops in Enshi area
Shi-Qi TANG1,2,3, Neng WAN4, Ming-Zhong ZENG4, Ke YANG1,2,3, Fei LIU1,2,3, Min PENG1,2,3, Kuo LI1,2,3, Zheng YANG1,2,3
1. Institute of Geophysical and Geochemical Exploration,Chinese Academy of Geological Sciences,Langfang 065000,China 2. Research Center of Geochemical Survey and Assessment on Land Quality,China Geological Survey,Langfang 065000,China 3. Key Laboratory of Geochemical Cycling of Carbon and Mercury in the Earth's Critical Zone,Chinese Academy of Geological Sciences,Langfang 065000,China 4. Hubei Geological Survey,Wuhan 430034, China
The 1:25 million land geochemical survey conducted in Enshi area shows that the surface soil in Enshi area is rich in selenium, and the content of cadmium is also high. Based on the data of 3 950 surface soil samples and 362 crop samples in this area, the geochemical characteristics of selenium and cadmium, co-generation factors, and the capability of different types of crops for absorbing and enriching the two elements are discussed.The results show that the selenium and cadmium in the surface soil of Enshi area is associated with each other. The distribution of the two elements is mainly controlled by the Permian soil parent material, and the occurrence of selenium and cadmium is closely related to organic matter and sulfide in soil. Comparison of BCF of selenium and cadmium in different crops shows that ginkgo, corn and tea have higher absorption capacity for selenium than for cadmium, and hence these crops could be used as the preferred crops for the development of selenium-enriched agricultural products in Enshi area. At the same time, the pH of the soil should also be considered. The medium alkaline soil may be more likely to avoid the risk of cadmium enrichment in agricultural products. In addition, selenium has a detoxifying effect on cadmium. Selenium-rich environment will significantly reduce the harm of cadmium to human body.
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Shi-Qi TANG, Neng WAN, Ming-Zhong ZENG, Ke YANG, Fei LIU, Min PENG, Kuo LI, Zheng YANG. Geochemical characteristics of selenium and cadmium in soil and crops in Enshi area. Geophysical and Geochemical Exploration, 2020, 44(3): 607-614.
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