Studies of Stability Constants of Several Metal Complexes with N-(2-Naphthyl)ethylenediamine-N, N, N-triacetic Acid
| Autor: | Taketsune Miyahara, Kusuo Narita, Yoshio Takino |
|---|---|
| Rok vydání: | 1991 |
| Předmět: |
medicine.diagnostic_test
Chemistry Metal ions in aqueous solution Inorganic chemistry Ethylenediamine General Chemistry General Medicine Metal chemistry.chemical_compound Stability constants of complexes visual_art Spectrophotometry Diamine Drug Discovery visual_art.visual_art_medium medicine Titration Chelation |
| Zdroj: | Chemical and Pharmaceutical Bulletin. 39:2140-2142 |
| ISSN: | 1347-5223 0009-2363 |
| DOI: | 10.1248/cpb.39.2140 |
| Popis: | Stability constants of Cd(II), Cu(II), Hg(II), Pb(II) and Zn(II) chelates with N-(2-naphthyl)ethylenediamine-N, N', N'-triacetic acid (NEDTA) were determined by spectrophotometric and fluorophotometric methods at 25±1°C. The composition of the NEDTA chelate with each metal ion was 1 : 1 both by the molar ratio and the continuous variation methods with spectrophotometry. The stability constants (log K) determined by the spectrophotometric method were as follows : Cd(II), 9.49; Cu(II), 14.62; Hg(II), 15.08; Pb(II), 11.77; and Zn(II), 11.00. Those by the fluorophotometric method were as follows : Cd(II), 9.67; Cu(II), 14.05; Hg(II), 15.93; Pb(II), 11.32 and Zn(II), 10.99.The conditional stability constants (log K') of these metal-NEDTA chelates at pH 4 were in the range of 6 to 11, which were large values compared to usual metal indicators. NEDTA shold be a useful indicator for microchelatometric titration and applicable to detection of a trace amount of several metal ions. |
| Databáze: | OpenAIRE |
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