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Citation: Tao Zu-Yi, Dou Hui-Yuan, Wang Chang-Shou. Intrinsic Protonation Constants of Chelating ion Exchange Resin[J]. Acta Physico-Chimica Sinica, ;1993, 9(04): 516-522. doi: 10.3866/PKU.WHXB19930417 shu

Intrinsic Protonation Constants of Chelating ion Exchange Resin

1.
Department of Modern Physics, Lanzhou University, Lanzhou , People's Republic of China 730000

Received Date: 22 January 1992
Available Online: 15 August 1993

The intrinsic protonation constants of three steps of chelating ion exchange resin D751 containing iminodiacetic groups in water and ethanol-water mixtures have been deter-mined at 25 ℃ by potentoimetric titration and by means of the extrapolation procedure without the assumption on the activity coefficients of charged species in the resin phase. The changes in the acid-base properties of the chelating resin D751 in the water and the ethanol-water mixtures have been obse-rved, and the observed effects are explained. The variation of apparent protonation constants with the degree of neutralizaton has been demonstrated.
- Chelating ion exchange resin; Apparent protonation constant; Intrinsic protonation conatant; Ethanol-water mixture solvent
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