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Simultaneous polarographic determination of Co(II), Co(III) and Ag(I) in electroless silver plating solutions containing Co(II) as reducing agent

Norkus E., Vaškelis A., Jagminienė A., Norkus P.

Chemia Analityczna

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2001

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Vol. 46, No. 2

285-289

EN

A dc-polarographic method for the determination of Co(II), Co(III) and Ag(I) in one sample in ammonia-ammonium sulfate solutions is described. The preferred concentrations for which a linear dependence between the polarographic-wave height and the concentration exists are in the range: Co(II) — 0.2-3.0 mol 1.1, Co(III) — 0.15-1.1mol 1(-1) and Ag(I) — 0.1-1.6 mmol1(-1). The method proposed was applied in the analysis of a new type electroless silverplating solutions containing Co(II)-ammonia complex compounds as the reducing agents.

PL

Opisano polarograficzną metodę oznaczania Co(II), Co(III) i Ag(I) w próbkach zawierających bufor amoniak-siarczan anionu. Liniowe zależności między wartością fali polarograficznej i stężeniem metalu otrzymano w zakresach: Co(II) — 0.2 - 3.0 mmol1(-1), Co(III) — 0.15-1.1 mmol 1(-1) i Ag(I) — 0.1-1.6 mmol 1(-1). Opracowaną metodę wykorzystano w analizie nowego typu kąpieli do bezprądowego osadzania srebra, w której czynnikiem redukującym jest kompleks amonowy Co(II).

2

Polarographic and Spectrophotometric Investigation of Cu(II) Complexation in Alkaline and Strongly Alkaline Solutions of Complexones

Norkus E., Pauliukaite R.

Polish Journal of Chemistry

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2000

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Vol. 74, nr 9

1231-1231

EN

Polarographic and spectrophotometric investigations of Cu(II) complex formation with CDTA (trans-cyclohexane-1,2-diaminetetraacetic acid), HEDTA (hydroxyetylethylenediaminetriacetic acid), TTHA (triethylenetetraaminehexaacetic acid) and EGTA (ethylenedioxydiethylenediaminetetraacetic acid) (so-called complexones) in alkaline solutions at 20 °C and J = 3 mol/l showed that Cu(II) ions form monohydroxycomplexes with CDTA and HEDTA anions, and dihydroxycomplex with TTHA anion alongside with the simple complexes. The formation of the hydroxycomplexes in the Cu(II)–EGTA anion system was not confirmed. The equilibrium constants of the hydroxycomplexes formation were determined. The stability constants, diffusion coefficient values and optical characteristics of the complex species discussed are given.

3

Kinetics of Interaction Between Methanediol and (+)-Tartrate in Alkaline Solutions

Norkus E., Pauliukaite R., Vaskelis A.

Polish Journal of Chemistry

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1999

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Vol. 73, nr 11

1837-1844

EN

The cyclic acetal formed may have influence on the anodic oxidation of formaldehyde on copper, as well as on the adsorption phenomena taking place at the interface copper-solution, and is important for understanding of the processes taking place during the electroless copper deposition.