caa a22 4500 467920567 CHVBK 20180406152916.0 cr unu---uuuuu 170328e20061101xx s 000 0 eng 10.1007/s00706-006-0527-8 doi (NATIONALLICENCE)springer-10.1007/s00706-006-0527-8 Ion-Pair Solvent Extraction of EDTA Anions with Tetraalkylammonium Ions in Various Organic Solvents [Elektronische Daten] [Keiichi Satoh, Zhang Xiang-Yu, Masashi Miya-iri, Akiko Honma, Kiyoshi Sawada] Summary.: The ion-pair solvent extraction behavior of ethylenediaminetetraacetate (EDTA) anion by various tetraalkylammonium ions was investigated at 25.0 ± 0.1°C. The extraction of EDTA exceeded 90% from the basic aqueous solution into the organic solvents such as n-hexane and benzene derivatives containing tri-n-octylmethylammonium chloride, but EDTA was hardly extracted from acidic solution. Among the chemical species of EDTA in aqueous solution, edta 4− is the most extractable one. On the other hand, the extraction of EDTA was less than 1% into chloroform and 1,2-dichloroethane even from the basic aqueous solution. The effect of the structure of alkylammonium ion was also examined. Tetra-n-hexylammonium and tetra-n-octylammonium ions could not extract EDTA even from the basic aqueous solution, while the use of tri-n-octylmethylammonium and di-n-lauryldimethylammonium ions enhances the extraction of EDTA. These results suggest that the steric hindrance in the ion-pair of alkylammonium and EDTA anion in the organic phase affects the extractability of EDTA containing ion-pair. The solution structure of ion-pair in the organic phase was calculated by MMFF force field and the steric effect in the ion-pair was also suggested. From the extraction constants obtained, the possibility of the extraction separation of EDTA has been shown. Springer-Verlag, 2006 Keywords. Ion-Pair nationallicence EDTA nationallicence Molecular modelling nationallicence Solvent effect nationallicence Solvent extraction nationallicence Satoh Keiichi Laboratory of Analytical Chemistry, Faculty of Science, Niigata University, Ikarashi nino-cho, Niigata, Japan aut Xiang-Yu Zhang Laboratory of Analytical Chemistry, Faculty of Science, Niigata University, Ikarashi nino-cho, Niigata, Japan aut Miya-iri Masashi Laboratory of Analytical Chemistry, Faculty of Science, Niigata University, Ikarashi nino-cho, Niigata, Japan aut Honma Akiko Laboratory of Analytical Chemistry, Faculty of Science, Niigata University, Ikarashi nino-cho, Niigata, Japan aut Sawada Kiyoshi Laboratory of Analytical Chemistry, Faculty of Science, Niigata University, Ikarashi nino-cho, Niigata, Japan aut Monatshefte für Chemie / Chemical Monthly Springer-Verlag 137/11(2006-11-01), 1375-1383 0026-9247 137:11<1375 2006 137 706 https://doi.org/10.1007/s00706-006-0527-8 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00706-006-0527-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Satoh Keiichi Laboratory of Analytical Chemistry, Faculty of Science, Niigata University, Ikarashi nino-cho, Niigata, Japan aut NATIONALLICENCE 700 1- Xiang-Yu Zhang Laboratory of Analytical Chemistry, Faculty of Science, Niigata University, Ikarashi nino-cho, Niigata, Japan aut NATIONALLICENCE 700 1- Miya-iri Masashi Laboratory of Analytical Chemistry, Faculty of Science, Niigata University, Ikarashi nino-cho, Niigata, Japan aut NATIONALLICENCE 700 1- Honma Akiko Laboratory of Analytical Chemistry, Faculty of Science, Niigata University, Ikarashi nino-cho, Niigata, Japan aut NATIONALLICENCE 700 1- Sawada Kiyoshi Laboratory of Analytical Chemistry, Faculty of Science, Niigata University, Ikarashi nino-cho, Niigata, Japan aut NATIONALLICENCE 773 0- Monatshefte für Chemie / Chemical Monthly Springer-Verlag 137/11(2006-11-01), 1375-1383 0026-9247 137:11<1375 2006 137 706 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer