ISSN:
1040-0397
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
The free, or ionized, calcium concentration in white wine was determined using a calcium ion-selective electrode. Calibration was achieved using a standard curve constructed from calcium standards that matched each wine sample in pH, ionic strength, and ethanol concentration. A more rapid procedure for the determination of the calcium ion activity using aqueous standards was also studied. The effect of dilution on the ratio of free to bound calcium was examined. Using a dilution factor of 10, between 71 and 78% of the total calcium concentration can be sensed by the electrode, the proportion increasing to between 81 and 92% with a dilution factor of 100. The estimation of the total calcium concentration, based on the value obtained from the 10-fold dilution, is proposed.
Additional Material:
2 Tab.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/elan.1140030619
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