COPPER AS A PHOTOMETRIC INDICATOR IN THE SELECTIVE CHELOMETRIC TITRATION OF METAL ION MIXTURES
Abstract
Photometric and point detection permits selective chelometric determination of metal ions in mixtures with much less masking than required for visual or potentiometric techniques. Copper has been found to be a useful photometric indicator for such titrations. Prediction of appropriate titration conditions is readily accomplished with graphical plots of effective chelonate stability. Calcium is determined in the presence of magnesium with ethylene glycol bis(beta-aminoethyl ether)-N,N-tetraacetic acid in 0.5 M ammonium hydroxide at pH 10. Selective determination of cadmium or of zinc in the presence of the other is carried out with diethylenetriaminepentaacetic acid under the same conditions. Attention is directed to the importance of competitive equilibria which affect chelonate stability, and stability constants for ammonia derivatives of some copper chelonates are reported. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 02, 1961
- Accession Number
- AD0255479
Entities
People
- David A. Aikens
- Gaby Schmuckler
Organizations
- University of North Carolina at Chapel Hill