Silicate rocks—Determination of molybdenum and tungsten content—Sulfuric acid-phenylhydroxyacetic acid-cinchonine-potassium chlorate medium polarographic method
Silicate rocks—Determination of nickel and cobalt content—Ammonium hydroxide-ammonium chloride-sulfosalicylic acid-dimethyl glyoxime medium polarographic method
Methods for chemical analysis of copper ores lead ores and zinc ores—Determination of tungsten content—Catalytic polarographic method in sulfuric acid-phenylhydroxy acetic acid-cinchonine-potassium chlorate system