IDENTIFICATION
Solubility (Vol. 4) Insoluble in water and organic solvents; soluble in concentrated mineral
acids
PURITY
Loss on drying (Vol. 4) Iron Oxide Red : Not more than 1.0% (105°, 4 h)
Water-soluble matter Not more than 1.0%
See description under TESTS
Arsenic (Vol. 4) Not more than 3 mg/kg
Determine by the atomic absorption hydride technique. The selection of
sample size and method of sample preparation may be based on the
principles of the methods described in Volume 4 (under "General Methods,
Metallic Impurities").
Cadmium (Vol. 4) Not more than 1 mg/kg
Determine using an atomic absorption/ICP technique appropriate to the
specified level. The selection of sample size and method of sample
preparation may be based on the principles of the methods described in
Volume 4 (under “General Methods, Metallic Impurities”).
Lead (Vol. 4) Not more than 10 mg/kg
Determine using an atomic absorption/ICP technique appropriate to the
specified level. The selection of sample size and method of sample
preparation may be based on the principles of the methods described in
Volume 4 (under “General Methods, Metallic Impurities”).
Mercury (Vol. 4) Not more than 1 mg/kg
Determine by the cold vapour atomic absorption technique.