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~onmenial Fa~~ <br /> <br /> <br /> <br /> <br />Environmental Fate <br />~ ----- - <br />http://www.24d. orgienc. html <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 States <br />to 16 to 24 inches in low organic soils. Soils were sampled to a depth of 48 inches. Its average half-life <br />' in soils ranged from 6.4 days in southern soils to 8.3 days in high organic matter soils. The average <br />half-life in grass was 6. ] days and 6.9 days in thatch. The half-life in natural water was two to four <br />weeks, although in areas where soil microbes were conditioned to 2,4-D, such as a treated rice paddy, <br />t the half-life was as short as one day. The acid form of 2,4-D, as well as the amine and ester chemical <br />groups, metabolized to compounds of nontoxicological significance and ultimately to forms of cazbon. <br />Thus, 2,4-D is considered a biodegradable compound. Under normal conditions, 2,4-D residues are not <br />' 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 />Em~rronrnenlal Toxicology and Chemrsrry, 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 Pane. <br />INDUSTRY TASK FORCE 11 ON 2,4-D RESEARCH DATA <br />' B-26 Cedar Point Villas <br />Srvansboro, NC 28584 <br />)nformation Line: U.S. and Canada (800)345-5109 <br />FAX (252)393-6327 <br />' Or contact Don Page via email. <br />~2 12/18/199R 957 AM <br />