Simultaneous determination of free calcium,magnesium, sodium and potassium ion concentrations in simulated milk ultrafiltrate and reconstituted skim milk using the Donnan Membrane Technique |
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| Authors: | R Gao EJM Temminghoff HP van Leeuwen HJF van Valenberg MD Eisner MAJS van Boekel |
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| Affiliation: | 1. Department of Soil Quality, Wageningen University and Research Center (WUR), P.O. Box 47, 6700 AA Wageningen, The Netherlands;2. Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, PR China;3. Alterra, WUR, P.O. Box 47, 6700 AA, Wageningen, The Netherlands;4. Yantai Institute of Costal Zone Research, Chinese Academy of Sciences, Yantai 264003, PR China |
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| Abstract: | This study focused on determination of free Ca2+, Mg2+, Na+ and K+ concentrations in a series of CaCl2 solutions, simulated milk ultrafiltrate and reconstituted skim milk using a recently developed Donnan Membrane Technique (DMT). A calcium ion selective electrode was used to compare the DMT results. The study showed that the free Ca2+ concentrations measured by the DMT agreed well with calcium electrode data. Concentrations of free Ca2+, Mg2+, Na+ and K+ measured by the DMT agreed with concentrations predicted by existing ion speciation models. It is concluded that the DMT is suitable to measure various free metal ion concentrations simultaneously in complex milk-type systems. |
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