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Molybdenum (Mo) availability in soil, dietary intake and its health risk assessment in the soil-food crops system

James, Blessing, Ting, Jia, Wang, Guo
Environment international 2019
Brassica rapa subsp. chinensis, Lactuca sativa, Lotus, Spinacia oleracea, food crops, food intake, health effects assessments, iron oxides, lettuce, molybdenum, rice, risk, silt, soil properties, soil sampling, spinach, China
In order to evaluate the accumulation characteristics, transfer factor and health risk exposure of Mo in the soil-food crops system, a total of six hundred and sixteen (616) edible parts of 43 food crop types and the corresponding surface soil samples were collected from some of the areas in Fujian Province, China. The results showed that the total and available soil Mo ranged from 0.28 to105 and 0.00 to 19.55 mg kg−1 respectively, and were significantly correlated. The Mo concentration in the food crops ranged between 0.001 and 16.53 mg kg−1, with an average of 1.22 mg kg−1. Among the various food crop types, Lettuce (Lactuca sativa), contained the lowest mean Mo content (0.008 mg kg−1), whereas Spinach (Spinacia oleracea), had the highest mean Mo concentration (26.17 mg kg−1). Also, the Mo concentrations in the edible parts of only three food crops (Te-you 627, an indica rice, Lotus seed, a rooty vegetable and Pakchoi, a leafy vegetable), were significantly correlated with their corresponding available soil Mo. Among the soil properties, the free iron oxides, CEC and silt of the soils, showed significantly negative correlations with TFavail, indicating that these soil physiochemical properties were the main soil parameters influencing the transfer of Mo from the soil to the food crops. The EDI revealed that local residents may be exposed to health risks by consuming Spinach (Spinacia oleracea), a leafy vegetable produced from the investigated area, therefore more concern should be given to the cultivation process and consumption of the leafy vegetable produced from the study area.