|
Description
|
Colourless crystals or a white powder; slightly. hygroscopic in moist air
|
|
Identifications
|
-
|
|
Identification 'A'
|
The spectrum of sample should be concordant with spectrum of standard
|
|
Identification 'B'
|
Passes test
|
|
Identification 'C'
|
Passes test
|
|
Appearance of solution
|
Passes test
|
|
Arsenic
|
NMT 1 ppm
|
|
Barium
|
Passes test
|
|
Calcium (Ca)
|
NMT 200 ppm
|
|
Heavy metals
|
NMT 10 ppm
|
|
Iron
|
NMT 50 ppm
|
|
Chlorides
|
NMT 50 ppm
|
|
Sulphate (SO4)
|
NMT 150 ppm
|
|
Oxalic acid
|
Passes test
|
|
Readily carbonisable substance
|
Any colour produced is not more intense than that of a mixture of 1.0 ml of CCS and 9.0 ml of FCS
|
|
Sulphated ash
|
NMT 0.1%
|
|
Water
|
NMT 1.0%
|
|
Assay
|
99.0 – 101.0%
|