Simultaneous Determination Of Iron(iii) And Cobalt(ii) With N-phenyleinnamohydroxamie Acid (pclla) And Thiocyanate And De-termination Of Iron(iii) Ilith Pcha O.nd Azide By Solvent Extraction And Spectrophotometry

Iron(III) and cobalt(II) have been found to reactrnIvith thiocyana-te in the presence of N-phenyleinnamohydroxamicrnacid to form pinkish red and blue colored compl(exes, respectively.rnBoth the complexes I-lere found to be quantitativfelyrnextractable into ethylacetate from 0.5-1.5 M hydrochloricrnacid solutions. The spectra of iron(III) and cobalt(II)rncomplexes exhibited absorption maxima in the visible regionrnat 495 and 625 nm Hith molar absorptivitles of 1800.0 andrn-1 -1 1820 1 mol ern , respectively. The coloured systems obeyedrnBeer! s laH in the concentration loange of 0.2- 3.9 ppm of ironrnand 2-41 ppm of cobalt. The composition of the complexesrnhave been found to be 1:2:2 (Fe:SCN-:PCHA) and 1:4 (Co:SCN-).rnThe effect of foreign ions and other experimental variablesrnin the extraction and determination of iron(III) and cobaltrn(II) have been studied. On the basis of these studiesrnsimple, precise, sensitive, and highly selective methodsrnhave been developed for the determination of iron(III) and cobal t (II) and for the simultaneous determination of bothrnmetal ions by solvent extraction and spectrophotometry.rnThe methods have been applied successfully for the determinationrnof iron and cobalt in steel and biosamples.rnIron(III) was also found to react with azide in thernpresence of PCHA to produce an orange coloured complexrnhaving a composition of 1:2:2 (Fe:N;:PCHA). The complexrnwas found to be stable and quantitatively extractable intornethylacetate from 0.1-0.9 11 Hel solutions allol-ling repro··rnducible and reliable spectrophotometric determination ofrniron. The complex has maximum absorption at 447 nm I-lithrn-J -1 molar absorptivity of 7500 1 mol 'cm and obeyed Beer'srnlaw in the range of 0.5-9 ppm of iron(III). From the studyrnof the effect of foreign ions and several variables, thernmethod I-Ias found to be highly selective and largely freernfrom rigid control of experimental variablcs. The methodrnvias found to be effective by applying for the determinationrnof iron in blood and s"teel samples. Thus, a new rapid,rnprecise, sensitive and highly selective method for determinationrnof iron(llI) with PCHA and azide has bean developed

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