论文信息 - Aqueous Gel Permeation Chromatographic Methods for Technical Lignins

Aqueous Gel Permeation Chromatographic Methods for Technical Lignins

Abstract The molecular weights and molecular weight distributions of lignosulfonates and soda lignins were determined by aqueous gel permeation chromatography (GPC). The elution behavior of the samples, was investigated in detail to evaluate the non-size-exclusive effect in the aqueous GPC system. The ionic strength and pH are thought to be the main factors influencing the accuracy and the reliability of measurements. Solutions of 0.1M NaNO3 with pH 7 or 0.1 M NaNO3 with pH 12 were shown to be optimum for determining the molecular weight of lignosulfonate and alkali lignin. Accuracy of the method was checked by comparing the data obtained by aqueous GPC with that from vapor pressure osmometry (VPO).

Fangeng Chen | Jing Li

[1] U. Brinkman,et al. Combined high-performance aqueous size-exclusion chromatographic and pyrolysis-gas chromatographic-mass spectrometric study of lignosulphonates in pulp mill effluents , 1993 .

[2] V. Zakharov,et al. Exclusion liquid chromatography of lignins and lignocarbohydrates complexes , 1992 .

[3] K. Lundquist,et al. Gel Permeation Chromatography of Lignin Carbohydrate Compounds , 1983 .

[4] H. Barth. A Practical Approach to Steric Exclusion Chromatography of Water-Soluble Polymers , 1980 .

[5] B. Stenlund,et al. The influence of charged groups in gel permeation chromatography of polyelec-trolytes , 1973 .

[6] J. Mccarthy,et al. Lignin. XIV. Gel Chromatography and the Distribution in Molecular Size of Lignin Sulfonates at Several Electrolyte Concentrations , 1968 .