“…Other metnods include the analysis of alloys (306,488,534), catalysts (296,442,443,720), and ores (622, 745). Cr has been determined in steels by potentiometric (451), amperometric (271), and polarographic (60, 649) methods. Amperometric (23) and polarographic (714) methods have also been used for the analysis of rocks and ores.…”