Aldicarb Studies in Ground Waters from Florida Citrus Groves and Their Relation to Ground—Water Protection

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Abstract
The disappearance of aldicarb [2–methyl–2(methylthio) propionaldehyde 0‐(methylcarbamoyl) oxime] and its two toxic degradation products, aldicarb sulfoxide and aldicarb sulfone, were measured in laboratory studies using ground waters and subsoils collected from citrus groves in Indian River County, Florida, and incubated under controlled conditions which best represented the in situ environment. The half‐life times for the disappearance of aldicarb and its two oxidized sulfur derivatives in ground‐water‐saturated subsoils ranged from 10–26 days. Based on the degradation rates found in this study, hydrologic parameters obtained for Indian River County subsoils, and amounts of total toxic residue reported entering Florida ground waters, it was estimated that toxic residues in aldicarb‐contaminated ground waters in Indian River County would migrate only short distances (0.3–5.2 m) before conversion of toxic residues to nontoxic residues was complete.