Effect of Common Ions in Agricultural Additives on the Retention of Cd, Cu, and Cr in Farmland Soils

Xu Zhou and Hongbin Cao ()
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Xu Zhou: Beijing Area Major Laboratory of Protection and Utilization of Traditional Chinese Medicine, Beijing Normal University, Beijing 100875, China
Hongbin Cao: Beijing Area Major Laboratory of Protection and Utilization of Traditional Chinese Medicine, Beijing Normal University, Beijing 100875, China

Sustainability, 2024, vol. 16, issue 11, 1-13

Abstract: The anions and cations in agricultural additives have crucial impacts on the retention of toxic heavy metals (HMs) in soil. However, the influence of these ions on the adsorption and desorption of Cd, Cr, and Cu in soil has not been clarified in previous studies. This study investigated the adsorption behavior of HMs, common anions, and dissolved organic matter (DOM) in alkaline soil from farmland under different experimental conditions. Nitrates, sulfates, and chlorides were used as HM sources to investigate the effects of different experimental anion environments on batch adsorption experiments and fluorescence quenching titration experiments. Batch sorption experiments showed that the sorption of Cd 2+ was inhibited by the concomitant presence of Cr 3+ and Cu 2+ , and the presence of Cl − and SO 4 2− inhibited the binding of HMs to the soil matrix compared to NO 3 − . The fluorescence quenching titration with HMs suggested that SO 4 2− significantly enhances the binding ability of Cr 3+ to DOM in solution, which may be the reason SO 4 2− inhibited Cr 3+ retention in soil. These results provide detailed insights into the interactions of HMs with DOM and anions, which is of great significance for the targeted application of pesticides and HMs’ transport and removal in farmland soils.

Keywords: dissolved organic matter; EEM-PARAFAC; metal binding; coexisting anions; competitive sorption (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2024
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