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首页> 外文期刊>electroanalysis >Modeling of a CdII–N‐(2‐hydroxyethyl)ethylenediamine system and optimization of stability constants by the use of complex formation curves. A polarographic study at a fixed L:M ratio and varied pH
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Modeling of a CdII–N‐(2‐hydroxyethyl)ethylenediamine system and optimization of stability constants by the use of complex formation curves. A polarographic study at a fixed L:M ratio and varied pH

机译：Modeling of a CdII–N‐(2‐hydroxyethyl)ethylenediamine system and optimization of stability constants by the use of complex formation curves. A polarographic study at a fixed L:M ratio and varied pH

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AbstractThe ligandN‐(2‐hydroxyethyl)ethylenediamine (HEEN) was studied with CdIIby differential pulse polarography (DPP) at fixed total ligand (LT) to total metal (MT) concentration ratios and varied pH at 25°C and an ionic strength μ = 0.5 mol dm−3. The polarographic experimental complex formation curve (ECFC) and calculated complex formation curve (CCFC) were used for modeling of the metal‐ligand system and the refinement of stability constants. The ECFC, in which experimental parameters of polarographic peaks are included (a shift in a peak potential and a variation in a peak height) appears to be a characteristic function for a particular metal‐ligand system studied at a particular LT: MTratio. The CCFC is a theoretical curve calculated for the assumed metal‐ligand model from mass‐balance equations. The final model of metal species formed is the one for which the CCFC fits best the ECFC. Four cadmium complexes CdL2+, CdL 22+, CdL 32+, and CdL2(OH)+and their stability constants as log β found from DPP 5.08 ± 0.03, 9.44 ± 0.04, 11.25 ± 0.05, 12.06 ± 0.03, respectively, are reported. The complex CdL 32+was found for the first time. Results obtained in this work are com

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