ULTRATRACE ANALYSIS BY COORDINATION CHAIN REACTIONS.
Final rept. 1 Nov 64-31 Oct 66,
PURDUE UNIV LAFAYETTE IND DEPT OF CHEMISTRY
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A summary is given of work intended to explore the analytical capabilities of a unique catalytic system including 1 ultratrace determination of metal ions, 2 selective ultratrace analysis, 3 automation of the method and 4 coupling of the reaction system in order to detect other trace species. In addition fundamental studies of the factors affecting the exchange rate of ligands coordinated to metal ions was continued. The application of this new kinetic method to ultratrace analysis was accomplished. As little as 10 to the -8th power M metal ions can be determined with 10 accuracy using manual techniques. Automatic measurement of the reaction rate constant permits analysis at the 0.01 ppm level within a few minutes. Stopped-flow mixing and an automated readout converts the transient photometric signal to a parameter which is a function of the trace metal present in the sample. The method is applicable to any metal capable of complexing EDTA. With pH control and the addition of masking agents the selective determination of metals is shown. The presence of 10 to the -8th power moles of dissolved O2 in water was detected by coupling reactions of O2 to the coordination chain reaction system. The complexation and therefore permit application of the extremely sensitive coordination chain system to the detection of many trace species. Author
- Inorganic Chemistry