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The Effect of Cations on the Extractability of Organic Chemicals Adsorbed to Soil

Sorption is an important factor in determining the potential impact of chemicals in the environment. There are many factors that affect the adsorption of chemicals to soil including, but not limited to; size, shape, molecular structure, polarity, solubility, configuration, polarizability and charge distribution of a chemical. Furthermore, soil has many characteristics that affect adsorption including cation exchange capacity (CEC), pH, clay content, particle size, ionic strength, as well as others. Although hydrophobic partitioning has been recognized to have a large role in sorption mechanisms,
other processes such as cation exchange and surface complexation with cations also have a role in sorption to soil. Exchangeable cations commonly found in the environment (Na+, Ca2+, Mg2+, K+) influence the adsorption of organic chemicals to soil. The current study utilizes different cations found in the environment to extract organic chemicals that are adsorbed to soil for analysis.