Rapid visual compleximetric titration of calcium in natural waters.
Visual compleximetric methods for the titration of calcium in the presence of magnesium have been based either on masking the magnesium or using an indirect indicator procedure, e.g., the system Zn-EGTA-Zincon. In the proposed method these two approaches are combined. Zn-EGTA complex is added to the mixture and the zinc liberated in the calcium replacement reaction is titrated with EGTA after the magnesium has been masked with fluoride ion.
Fleet
B
B
Chemistry Department, Imperial College, London, S.W.7, U.K.
Soe-Win
West
T S
TS