The extractability of pesticides and other organic chemicals, which may find their way onto soil, has been of great interest. Extractability of any test substance in Environmental Fate Testing is a necessary objective in order to measure the parent test substance and its degradates to describe the degradation pathway of the test substance. The goal of this experiment was to utilize different cations in attempt to increase extractability of organic compounds that have adsorbed to soil. Different cations were tested with various oxidation states including K+, Na+, NH4+, Mg2+, Fe2+, and Al3+. Cations that are commonly found in the environment (Na+, Ca2+, Mg2+, K+) are known to influence the adsorption of organic chemicals to soil. Six 14C-radiolabled organic chemicals (Acetaminophen, Daidzein, TPCK, Atrazine, N-Isopropylpipecolic acid, and N,N-Diethyl-3-methylbenzamide) and four different soils with varying characteristics were used. Results indicated that extraction solvents containing monovalent cations (K+, Na+, NH4+) were effective at increasing the extractability in comparison to 4:1 acetonitrile:water alone. The addition of cations to an extraction scheme can be a useful tool to enhance the recovery of adsorbed residues onto soil.

Extractability of adsorbed organic chemicals using cations

256th National Meeting (2018)

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