Polarographic determination of impurities in high-purity phosphorus.
Square-wave and radio-frequency polarographic techniques in phosphoric acid-potassium chloride media are applied to the simultaneous determination of copper, lead and cadmium in highpurity red phosphorus down to a level of 0.1 ppm. In addition ca. 0.01 ppm of cadmium is determined by R.F. polarography in potassium sulphate base electrolyte after cation-exchange separation.
Miwa
T
T
Faculty of Engineering Nagoya University Chikusa-ku, NagoyaJapan.
Kono
T
T
Isomura
R
R
Mizuike
A
A