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Title:   Author  item
                                            Hapeman, Cathleenitem
                                            PIERPOINT, ANTHONY - U. MARYLANDitem
                                            TORRENTS, ALBA - U. MARYLAND
  Submitted to: American Chemical Society Abstracts
                                    Publication Type: Abstract Only
                                    Publication Acceptance Date: 8/18/2002
                                    Publication  Date: 8/18/2002
                                    Citation: N/AInterpretive Summary:
                                Technical Abstract: Amitraz, N'-(2,4-dimethylphenyl)-N-(((2,4-dimethylphenyl)imino)methyl)-N-methylmethanimidamide, is an effective dip miticide for livestock.  The kinetics and mechanisms of amitraz hydrolysis were examined so that effective vat management and waste disposal strategies could be developed.  Hydrolysis afforded the acid-stable, 2,4-dimethylphenyl formamide and N-(2,4-dimethylphenyl)-N-methyl formamidine, both of which can be further hydrolyzed to 2,4-dimethylaniline.  Ozonolysis was examined as a subsequent treatment for the more toxic aniline byproduct.  The relative rate constants for the reaction of ozone were determined for several substituted anilines in aqueous solutions at pH 6.5 and 1.5.  At pH 6.5, with the exception of m- and p-nitroaniline, the rate constants obey Hammett's equation.  However, a linear plot of Hammett constants versus relative rate data at pH 1.5 showed poor correlation.  Poor correlation was similarly observed for amine group atomic charge determinations, suggesting varied reaction mechanisms.  Column studies conducted to determine the ability of ozone to degrade aniline on soil indicated that aniline was rapidly degraded under moist soil conditions, 5% (wt).  Removal of 77-98% of [14C] aniline was observed from soil columns initially affording nitrosobenzene and nitrobenzene; further oxidation led to CO2.


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