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nnvuonmentat rate <br /> <br />Environmental Fate <br />ragci~ii <br />2,4-D has a relatively short Half-life and is rather immobile in the soil. In 35 recent studies across the <br />U.S., the average lowest depth detected ranged from 6 to 12 inches in soils of the southern United <br />States to 16 to 24 inches in low organic soils. Soils were sampled to a depth of 48 inches. Its average <br />half-life in soils ranged from 6.4 days in southern soils to 8.3 days in high organic matter soils. The <br />average half-life in grass was 6.1 days and 6.9 days in thatch. The half-life in natural water was two to <br />four weeks, although in azeas where soil microbes were conditioned to 2,4-D, such as a treated rice <br />paddy, the half-life was as short as one day. The acid form of 2,4-D, as well as the amine and ester <br />chemical groups, metabolized to compounds of nontoxicological significance and ultimately to forms <br />of carbon. Thus, 2,4-D is considered a biodegradable compound. Under normal conditions, 2,4-D <br />residues aze not persistent in soil, water, or vegetation. <br />For the most recent published study, which reviews the 35 environmental fate studies funded by the <br />task force, plus other 2,4-D environmental fate studies in the scientific literature, see Wilson, R.D et al, <br />Dissipation in Field Soils after Application of 2,4-D Dimethylamine Salt and 2,4-D 2-Ethylhexyl Ester, <br />Errvrronmental Toxicology and Chemistry, Vol. 16(6), pp. 1239-1246, 1997, copies of which can be <br />made available through this task force, or seen on the 2.4-D Publication review site. <br />Return to our Home Paee. <br />INDUSTRY TASK FORCE II ON 2,4-D RESEARCH DATA <br />B-26 Cedaz Point Villas <br />Swansboro, NC 28584 <br />Information Line: U.S. and Canada (800)345-5109 <br />FAX (252)393-6327 <br />Or contact Don Page via email. <br />This page last updated on Monday,August 10, 1998. <br />http://www.24d.org/env.html 11/15/98 <br />