THE RAPID PRECISION DETERMINATION OF COBALT IN ALLOY STEELS BY THE POTRATZ TETRAPHENYLARSONIUM METHOD

摘要

In order to obtain adequate precision, such methods as the umpire electrolytic method are very long and involve so many manipulator steps that the possibility of errors and associated lack of precision is very large. Furthermore, the conversion to the final weighing form is often open to question. The exact formula of the cobaltic oxide (Co3O4) usually used is in doubt since it may contain CoO. Similar difficulties arise with the sulfate, and the reduction to metal is an added step when time is important.nThe procedure is rapid and quite precise, being equally as good as the usual reference method. Furthermore, much smaller concentrations of cobalt than usually required can be conveniently measured by merely increasing the sample size without altering the described procedure. Interference by elements such as iron, copper, molybdenum, and vanadium are eliminated or minimized by reduction and complexion.