Determination of semimicro amounts of calcium in the presence of other alkaline-earth metals.
Cyclam tetraacetic acid (CTA) is used to determine semimicro quantities of calcium in the presence of other alkaline-earth metals in natural and synthetic water samples. End-point detection is achieved amperometrically with Zn(en)(2+)(3) as the indicator. Magnesium and barium do not interfere. In the presence of strontium, two distinct end-points are obtained when its concentration is comparable with that of the calcium. If the concentrations are substantially different, calcium and strontium appear to be titrated together.
Maitra
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N
Department of Chemistry, Loyola University of Chicago, 6525 North Sheridan Rd, Chicago, IL 60626, U.S.A.
Herlinger
A W
AW
Jaselskis
B
B