Urea for industrial use — Determination of iron content — 2,2'- Bipyridyl photometric method
Describes a method applicable to iron contents greater than or equal to 0.00005 % (m/m). The principle is based on the ignition of the material at 800 °C and fusion of the residue with anhydrous potassium hydrogen sulphate. Solution of the cooled melt in hydrochloric acid and reduction of iron(III) by means of hydroxylammonium chloride. Formation of an iron(II)-2,2'bipyridyl complex in the…
Radio-frequency connectors. Part 5: R.F. coaxial connectors for cables 96 IEC 50-17 and larger
Gives the dimensions for pin connectors and socket connectors for cables 96 IEC 60050-17 and larger. The contents of the corrigendum of February 1971 have been included in this copy.