Noninstrumental Determination of Silver in Fixing Baths — an Extension

B. A. Hutchins, J. A. McGrath, D. Owerbach

Silver is precipitated as silver sulfide when a thiosulfate fixing bath is treated with thioacetamide. The silver is titrated, in effect, by adding graduated amounts of thioacetamide to aliquots of the fixing solution and then determining if all the silver has been precipitated. Each aliquot is filtered and the filtrate is allowed to run into more thioacetamide solution. Formation of more silver sulfide precipitate indicates that the end point has not been reached. Interference with the method by ferrous ions is eliminated by complexing the ferrous ions with ferricyanide.

Print ISSN
Published
1968-08
Content type
Original Research
DOI
10.5594/J06988