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Potentiometric investigation of complex formation of lead(II) with glycine and dl-alanine |
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| Affiliation: | 1. KTH Royal Institute of Technology, School of Engineering Sciences in Chemistry, Biotechnology and Health, Dept. Chemistry, Div. Surface and Corrosion Science, SE-10044 Stockholm, Sweden;2. KTH Royal Institute of Technology, School of Engineering Sciences in Chemistry, Biotechnology and Health, Dept. Chemistry, Div. Applied Physical Chemistry, SE-10044 Stockholm, Sweden |
| Abstract: | The complex formation of lead(II) with glycine and dl-alanine was investigated at 25°C in 3 mol dm−3 NaClO4 medium by e.m.f. titrations using glass and amalgam electrodes. The e.m.f. measurements were performed in the −log[H+] range between 2.5 and 9. Analysis of the e.m.f. data revealed that PbHL2+ is formed at −log[H+]<5 and PbL+ and PbL2 at higher −log[H+] values in both glycine and dl-alanine systems. The protonation constants of glycine and dl-alanine and the formation constants of the complexes are tabulated in Tables 1 and 2. |
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