Adsorption and isotope effects by ion exchange with aqueous-2-aminomethyl-18-crown-6 bonded merrifield resin.
Magnesium isotopes effects were investigated by chemical ion exchange using synthesized 2-aminomethyl-18-crown-6 (AM18C6) bonded Merrifield peptide resin. It was found that separation factors larger those reported previously were obtained, and the hydration and isotope mass effects are more significant than that of the complexation. The capacity of the crown ion exchanger was 2.3 meq/g dry resin. The adsorption capacity of the resin for magnesium ion was 26.8 mg/g dry resin at pH 7. The heavier isotopes of magnesium were enriched in the solution phase, while the lighter isotopes were enriched in the resin phase. The separation factors of (24)Mg-(25)Mg, (24)Mg-(26)Mg, and (25)Mg-(26)Mg were 1.0085, 1.0162, and 1.0081, respectively.
Kim
Dong Won
DW
Department of Chemistry, College of Natural Sciences, Chungbuk National University, Cheongju, 361-763, Republic of Korea. chem131@trut.chungbuk.ac.kr
Kang
Byung Moo
BM
Jeon
Byeong Kwang
BK
Ryu
Haiil
H