a.1.(Chem.) Pertaining to, or derived from, oxalic acid and aniline; - used to designate an acid obtained in white crystalline scales by heating these substances together.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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Pesticide transformation Several chemicals, such as alachlor by-products ethanesulfonic acid (ESA), alachlor oxanilic acid (OA), acetochlor ESA, acetochlor OA, metolachlor ESA, metolachlor OA, 3-hydroxycarbofuran, and terbufos sulfone.
Metolachlor, metolachlor ethanesulfonic acid, or metolachlor oxanilic acid (OA) was detected in 10-50% of samples, with concentrations ranging up to 4,420 ppt (OA).