Vol. 1, No 1, 1994 pp. 57 - 63
UDC
543.422.5
KINETIC DETERMINATION OF Mn(II) TRACES IN FeCl2 AND MgCl2
T.G. Pecev, R.P. Igov, S.M. Rančić
Faculty of science, Department of Chemistry, Ćirila i Metodija 2, 18000 Niš
Abstract. Kinetic method for Mn(II) trace determination in the solution, which is based on the catalytic effect of Mn(II) ions on the carmine acid (KA) oxidation by oxygene-peroxide in ammon-buffer, was applied for Mn(II) trace analyse in FeCl2∙4H2O (p.a.) and MgCl2∙6H2O (p.a.).
As 2,2'-dypyridile shows activating effect on this reaction and K-Na tartarate betters its selectivity, Mn(II) determinations in FeCl2∙4H2O were performed in the presence of 2,2'-dypyridile, and in MgCI2∙6H2O in the presence of K-Na tartarate. It is found that mean value of Mn(II) concentration in FeCl2∙4H2O was 5∙10-3% (with relative error of ± 10%), and in MgCl2∙6H2O was 5∙10-4% (with relative error of ± 4.7%).
KINETIČKO ODREĐIVANJE TRAGOVA Mn(II) U FeCl2 I MgCl2
Kinetička metoda za određivanje tragova mangana u rastvoru, zasnovana na katalitičkom dejstvu koje Mn(II) joni pokazuju na reakciju oksidacije karminske kiseline (KA) u amonijačnom puferu, primenjena je za analizu tragova Mn(II) u FeCl2∙4H2O (čistoće p.a.) i MgCl2∙6H2O (čistoće p.a.).
Budući da 2,2'-dipiridil pokazuje aktivatorsko dejstvo na primenjenu indikatorsku reakciju, a kalijum-natrijum tartarat znatno poboljšava njenu selektivnost, određivanje tragova Mn(II) u FeCl2∙4H2O vršeno je u prisustvu 2,2'-dipiridila, a u MgCl2∙6H2O u prisustvu kalijum-natrijum tartarata. Nađeno je da srednja vrednost koncentracije Mn(II) u FeCl2∙4H2O iznosi 5∙10-3%, sa relativnom greškom od ± 10%, odnosno u MgCI2∙6H20 - 5∙10-4% sa relativnom greškom od ± 4,7%.
