“…The determination of chromium received attention very early in the history of the mercury cathode, but difficulty was caused by the instability of the amalgam formed when a solution of the sulfate was electrolyzed (79,116,155). Removal of chromium by the mercury cathode has been found very useful in analysis of alloys, and improvements that permit satisfactory separation have been suggested by numerous investigators (22,28,40,50,73,74,119,164).…”