Biological and photochemical degradation rates of diethylenetriaminepentaacetic acid (DTPA) in the presence and absence of Fe(III).

摘要: Abstract The environmental fate of ethylenediaminetetraacetic acid (EDTA) has been extensively studied, while much less is known about the behaviour diethylenetriaminepentaacetic (DTPA). In this study, it was confirmed that DTPA persistent toward biodegradation. biodegradability investigated in absence and presence Fe(III) by using CO2 evolution test Manometric respirometry test. oxygen uptake iron-free (DTPA added as free acid) Fe(III)DTPA were than inoculum blank. Possible inhibitor effect analysed testing biodegradation sodium benzoate with without or Only slight inhibition observed when acid. Photodegradation Fe(III)–DTPA complex studied sunlight UV radiation at range 315–400 nm emitted black light lamps. results indicate degrades photochemically humic lake water. shown to be very photolabile water summer; photochemical half-life below one hour. products identified mass spectrometric technique (GC–MS). It photodegradation does not result total mineralization compound. Diethylenetriaminetetraacetic acid, diethylenetriaminetriacetic ethylenediaminetriacetic N,N′- and/or N,N-ethylenediaminediacetic iminodiacetate, ethylenediaminemonoacetic glycine Fe(III)DTPA. Based on these observations, we propose a pathway for