F. K. Cameron, G. H. Failyer
1903 Journal of the American Chemical Society  
SOME years ago Morrel12 offered a suggestion by which small quantities of potassium might be estimated. No experimental evidence was presented accompanying this suggestion, and so far as we are aware none has appeared elsewhere. Briefly, the method suggested is to separate the potassium from other bases in the form of the potassium platinic chloride, carefully free from an excess of reagents, take up in water and then add an excess of potassium iodide, when, on standing, a beautiful pink or
more » ... autiful pink or rose color develops, which gradually deepens to a maximum intensity. By matching the intensity of the color against that which would be developed in a standard solution of known concentration, a measure of the amount of potassium present could be obtained. Qualitative tests indicated that the method could probably be so adapted as to have a great value for a class of work upon which we have been engaged for some time past, and consequently a quantitative examination of the method was undertaken. The color of the solution is due probably to the forma-
doi:10.1021/ja02012a010 fatcat:76dybewj5bdjfgis7mxnchndfu