total of 70 rice samples were randomly collected from some markets in typical rice-producing areas such as Jiangxi, Hunan, Anhui and Guangdong in southern my country and from farmers in polluted areas. The contents of Cd, Zn and Se in the samples were measured respectively, and the content differences and differences in rice from different origins were analyzed. Its relationship with soil factors in the place of production was discussed, and the safety of food consumed by farmers on-site was discussed. The results showed that the Cd content of more than 70% of the tested samples exceeded the national food hygiene standard value (0.2mg¡¤kg-1), and Cd/Zn (Mass ratio) exceeds the 0.015 critical value recommended by American scholars. Among the three analyzed elements, Cd is the largest and Zn is the smallest. The content of elements analyzed and Cd/Zn among rice samples from different origins are all heavy metal contaminated rice. Soil origin > Acidic rice soil origin > Neutral rice soil origin, and the differences in Cd and Se contents are larger, and Zn is smaller. This shows that the chemical availability of soil Cd is the main factor affecting the Cd content of the tested rice, soil-rice Cd migration and grain accumulation in the system depend on human pollution and the chemical properties of the soil. With reference to the adult RfD (Cd) values recommended by WHO and USEPA and the average food consumption structure of Chinese residents, the analysis shows that all rice samples from the trial production areas are useful to farmers. There are varying degrees of potential Cd exposure risks for local consumption, especially in contaminated soil production areas and acidic red soil rice soil production areas. In addition, the Zn and Se contents of the tested rice samples are generally low and cannot meet normal dietary intake. Need. Therefore, the food safety risks of rice Cd pollution to local consumption farmers must be considered in southern rice production. Controlling rice Cd absorption and breeding for high yield and low Cd are very urgent for the sustainable development of southern rice production.

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Original research was done by Zhang Liangyun, Li Lianqing, Pan Genxingª³

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