Abiotic formation, hydrogen peroxide

Abiotic formation, hydrogen peroxide, 411 Abiotic oxidation... 

All three chloroacetic acids (chloroacetic acid [MCA], dichloroacetic acid [DCA], and trichloroacetic acid [TCA]) are naturally occurring (7), with TCA being identified in the environment most frequently (reviews (278, 405 108)). However, these chlorinated acetic acids also have anthropogenic sources. The major source of natural TCA appears to be the enzymatic (chloroperoxidase) or abiotic degradation of humic and fulvic acids, which ultimately leads to chloroform and TCA. Early studies (409) and subsequent work confirm both a biogenic and an abiotic pathway. Model experiments with soil humic and fulvic acids, chloroperoxidase, chloride, and hydrogen peroxide show the formation of TCA, chloroform, and other chlorinated compounds (317, 410-412). Other studies reveal an abiotic source of TCA (412, 413). 

C.L. Wilson, N.W. Hinman, R.P. Sheridan (2000). Hydrogen peroxide formation and decay in iron-rich geothermal waters The relative roles of biotic and abiotic mechanisms. Photochem. Photobiol, 71,691-699. 

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