Simultaneous kinetic determination of metal ion mixtures based on a ligand substitution reaction |
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Authors: | Edoardo Mentasti |
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Institution: | Istituto di Chimica Analitica, Università di Torino, Via P. Giuria 5, 10125 TorinoItaly |
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Abstract: | The rates of the ligand substitution reactions between 2-(4-sulfophenylazo)-l,8-dihydroxy-3, 6-naphthalenedisulfonic acid (SPADNS) complexes of Co2+, Ni2+, Pb2+ and Cu2+ and EDTA (or CDTA) have been studied at 25.0°C, pH 8.0–9.3, by stopped-flow spectrophotometry. The reactions are first order in SPADNS complex and in incoming ligand. The absorbance change during the reaction progress can be kinetically separated for each component of a mixture, so that metal ions down to 10-6 M can be determined. Components of very high reactivity, such as Cd2+, Mn2+ or Zn2+, can also be determined as part of a multicomponent mixture. |
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