22537-51-5Relevant articles and documents
Chromium(III)-catalysed Oxidation of Antimony(III) by Alkaline Hexacyanoferrate(III) and Analysis of Chromium(III) in Microamounts by a Kinetic Method
Nandibewoor, Sharanappa T.,Morab, Vidyavati A.
, p. 483 - 488 (1995)
The oxidation of antimony(III) by hexacyanoferrate(III) has been studied in alkaline media.A microamount of chromium(III) (1E-6 mol dm-3) is sufficient to catalyse the reaction.The active species of catalyst and oxidant in the reaction are understood to be (1-) and (3-).The autocatalysis exhibited by one of the products, i.e. antimony(V), is attributed to complex formation between antimony(V) and (3-).A composite mechanism and rate law are proposed.The reaction has been utilised for the analysis of chromium(III) in the range 5.2 ng cm-3-1.14 μg cm-3.
Bromide mediated oxidation of antimony(III) by cerium(IV) in aqueous sulphuric acid medium
Munavalli,Thabaj,Chimatadar,Nandibewoor
, p. 1579 - 1584 (2008/03/27)
The micro amount (10-3 mol dm-3) of bromide mediated oxidation of antimony(III) by cerium(IV) in an aqueous sulphuric acid medium has been studied spectrophotometrically at 25°C and I = 3.10 mol dm -3. In the presence of bromide, one mole of antimony(III) requires two moles of cerium(IV). The reaction is first order with respect to [cerium(IV)] and [bromide], whereas the order with respect to [antimony(III)] is less than unity. Increase in [sulphuric acid] accelerates the reaction rate. The order with respect to [H+ ion] is less than unity. Added products, cerium(III) and antimony(V) do not have any significant effect on the rate of reaction. The active species of oxidant is identified as H 3Ce(SO4)4-, whereas that of reductant as SbBr2+. The possible reaction mechanism is proposed and the activation parameters determined and discussed.
