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Nutrient elements are essential for human health. The intake of nutrient elements (Na, K, Ca, Mg, P, Mn, Fe, Zn, Cu, Se, Mo, and Cr) in the general Chinese population was comprehensively evaluated via a recent total diet study (2016–2019), covering more than two-thirds of the total population. The contents of nutrient elements in 288 composite dietary samples were determined by ICP-MS. The dietary sources, regional distribution, the relationship with the earth's crust, dietary intake, and health effects were discussed. Plant foods were the main source of both macro-elements and trace elements, accounting for 68–96% of total intake. Trace elements in food were compatible with their abundance in the earth's crust. Na intake reduced by 1/4 over the last decade but was still high. The average intake of Ca, Mg, Zn, and Se did not reach the health guidance values, while the average intake of K, P, Mn, Fe, Cu, Mo, and Cr fell within a reasonable range. No element exceeded the UL. However, an imbalance was identified in the dietary Na/K ratio and Ca/P ratio. This paper provides a most recent and national-representative assessment of nutrient element intake, indicating the significance of salt reduction and dietary structure optimization for the population. [ABSTRACT FROM AUTHOR]

BACKGROUND: Aflatoxin B1 (AFB1) is the most toxic and harmful aflatoxin, and has good thermal stability. Research reveals that AFB1 also exists in water, which is potentially harmful to human health. Therefore, it is urgent to remove AFB1 from water. In this work, a novel magnetic covalent organic framework composite (Fe3O4@COFs) is synthesized. RESULTS: The specific surface area is as high as 1293.32 m2 g−1. The adsorption capacity for AFB1 is 420 μg mg−1, which is six times or more that of other adsorbents. Fe3O4@COFs is employed for the adsorption and elimination of AFB1 from water. The removal efficiency is above 90% and it can be reused at least eight times. In addition, Fe3O4@COFs has been successfully used to remove trace AFB1 in actual water samples. CONCLUSIONS: The synthesized Fe3O4@COFs has good thermal stability, fast adsorption and large adsorption capacity, and can be recycled many times. Fe3O4@COFs exhibits excellent performance for the removal of AFB1, and has exceptional promise for application in water purification. © 2022 Society of Chemical Industry (SCI). [ABSTRACT FROM AUTHOR]