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Title: Spectrophotometric determination of cobalt(II) and gold(III) in the presence of potassium persulphate using resacetophenone oxime
Authors: Reddy, V Krishna
Reddy, S Mutta
Reddy, P Raveendra
Reddy, T Sreenivasulu
Issue Date: May-2000
Publisher: NISCAIR-CSIR, India
Abstract: Cobalt(II) and gold (III) react with 2,4-dihydroxy acetophenone oxime (RPO) forming yellowish brown and greyish green coloured soluble complexes respectively. The reactions are very slow but become fast in the presence of K2S2O8. This may be due to the enhancement of aerial oxidation of metal complexes with RPO in their lower oxidation states (Co(II), Au( III)) to coloured complexes with higher oxidation state (Co(III), Au(V)). The Co(III)-RPO complex shows λmax at 390 nm and at pH 9.5 obeying Beer's law in the range 0.12-1.80 μg/ml. Determination of Au(III) is carried out at 630 nm and pH 3.5 where Beer's law is obeyed in the range of 0.39-5.12μg/ml of Au(III). The effect of foreign ions in the method is studied. The method is applied for the analysis of Co(II) in vitamin B12 and Au(III) in Rheumartho Pharmaceutical sample.
Page(s): 557-559
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.39A(05) [May 2000]

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