Journal article

THE MECHANISM OF PRECIPITATION OF CALCIUM L( )-TARTRATE IN A MODEL WINE SOLUTION

AJ MCKINNON, GR SCOLLARY, DH SOLOMON, PJ WILLIAMS

COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS | ELSEVIER SCIENCE BV | Published : 1994

Abstract

The spontaneous precipitation of calcium tartrate has been studied using a model wine solution. Studies on solutions containing 130 mg calcium 1-1, 2 g tartaric acid 1-1 and 11% (v/v) ethanol in the pH range 3.1-3.5 have shown that the onset, rate and extent of precipitation depend on the initial pH of the model solution. By modification of the model to give solutions of different supersaturations, it has been established that, at supersaturations typical of wine, precipitation is induced by heterogeneous nucleation. Use of a calcium-ion-selective electrode to follow the precipitation process showed that there is a significant proportion of bound calcium in the model prior to and at the end ..

View full abstract