The instrumentation and methodology for real-time computer controlled scanning potential coulometry for multi-component trace analysis is described. The sensitivity limit was determined to be 10^-8 F for electrochemically reversible constituents. The sensitivity limit could be extended if measures were taken to compensate for the periodic signal found on the electrolysis current. Non-linear least squares curve fitting methods accurately resolved iron-platinum and silver-iron interferences to give accurate determinations for iron and silver. The resolving capability of this method was tested using theoretically generated scanning potential coulograms. The computer resolved sample constituents with a 1 to 100 concentration ratio and a formal potential separation of 10 millovolts. It also accurately resolved sample constituents with a 1 to 1000 concentration ratio, one with 1 equivalent per and the other with 2 equivalents per mole, but with no formal potential separation.
College and Department
Chemistry and Biochemistry
BYU ScholarsArchive Citation
Petty, Norman W., "Real-time computer optimized scanning potential coulometry for multi-component trace analysis" (1977). Theses and Dissertations. 8334.
Trace elements, Analysis, Coulometry