Abstract
Abstract Contamination of soils with trace metals has become an issue of major concern in recent years. One potential source of metals is commercial fertilizers. In this work, we analyzed 97 samples of solid commercial fertilizers sold in Iowa for 13 trace metals (Ba, Cd, Co, Cr, Cs, Cu, Li, Mn, Ni, Pb, Rb, Sr, and Zn) and six non‐trace metals (Al, Ca, Fe, K, Mg, and Na). Fertilizers included 24 samples of triple superphosphate (TSP), 23 of monoammonium phosphate (MAP), 25 of diammonium phosphate (DAP), and 25 samples of muriate of potash (MP). The concentrations of Cd, Cr, Mn, Sr, and Zn were greater and more variable than those of Co, Cu, and Ni in all the materials analyzed. The concentrations of Cd in the TSP samples ranged from 6.8 to 47 mg/kg, with a median of 8.1 mg/kg, but they were more uniform in the other fertilizer materials analyzed, with median values of 7.0, 6.7, and 1.6 mg/kg for MAP, DAP, and MP, respectively. The median values of Mn, Sr, and Zn in TSP samples were 288, 554, and 97 mg/kg,...
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