Mineral Element Contents of Six Dominant Fruits in Beijing and Their Dietary Risk Assessment

The contents of 9 mineral elements in 6 fruits produced in Beijing were detected by ICP-MS. Daily intake assessments of mineral elements from the fruits among different populations were conducted and analyzed using recommended nutrient intake (RNI) or adequate intake (AI) and tolerable upper intake level (UL), respectively. The result indicated that the correlation coefficients of linear regression equations of 9 elements were all above 0.9990, and the detection limits were between 0.125 and 125 μg/L. Besides, the recoveries of standard addition were between 81.25% and 110.46%, the relative standard deviations were all below 8%, and the measured values of national standard reference of rice were within the standard range. Hence this method was suitable for the determination of mineral elements in fruits because of its good precision and accuracy. The average contents of 9 mineral elements were followed by the order of Mg (92.58 mg·kg^-1) > Zn (6.03 mg·kg^-1) > Fe (4.75 mg·kg¹) > Mn (0.97 mg·kg¹) > Cu (0.61 mg·kg¹) > Cr (49.41 μg·kg¹) > Ni (38.19 μg·kg^-1) > Co (4.03 μg·kg^-1) > Se (1.47 μg·kg^-1), elements were significantly different from each other (P<0.05) and the range of coefficient of variation was from 51.22% (Cu) to 99.58% (Ni). Through the analysis and comparison of mineral elements in fruits, the content status and ordering rules were obtained, but selenium-rich sample had not been found. The degrees of mineral elements to meet human needs decreased with age. It was considered that peach, grape and pear met the daily dietary mineral intake requirement of the human to a higher degree. Intake of mineral elements from the above 6 fruits were safe to human health. The risk index of Mn and Zn were higher than other elements and should be paid special attention.