![reacting with hydrogen peroxide to produce hydroxyl radicals is 53 and the reaction constant of ferric ions reacting with hydrogen peroxide to form ferrous ions is 0.02 [7]. Therefore, it can be derived that the former reaction is far more swiftly than the latter, resulting a higher rate of hydroxyl radical formation in the first stage reaction than that in the second stage reaction. The rate of dichlorvos oxidation in the second stage is slower than that in the first stage, and the second stage will be referred to here as the Fe3+/H stage.](https://images.tandf.co.uk/common/jackets/crclarge/978156676/9781566766623.jpg "reacting with hydrogen peroxide to produce hydroxyl radicals is 53 and the reaction constant of ferric ions reacting with hydrogen peroxide to form ferrous ions is 0.02 [7]. Therefore, it can be derived that the former reaction is far more swiftly than the latter, resulting a higher rate of hydroxyl radical formation in the first stage reaction than that in the second stage reaction. The rate of dichlorvos oxidation in the second stage is slower than that in the first stage, and the second stage will be referred to here as the Fe3+/H stage.")
ABSTRACT
H ow ev er, in th e Ғ е2+/Н 2 С>2 s tage, th e d iffe ren ce in d ich lo rv o s o x id a tio n ra tes am o n g d iffe ren t in itia l pH is n o t o b v io u s; th e d ich lo rv o s rem a in in g are all b e tw een 4 4 .5 % ~ 4 8 .6 % . It can be d e riv ed th a t in itia l p H d o es n o t hav e an o b v io u s in flu en ce o n th e F e2+/H 202 reaction . P ig n ate llo [2] a lso sh o w ed th a t pH d oes n o t in flu en ce th e F e2+/H 202 reac tio n greatly .
