Appearance White crystalline powder, soluble in water, very slightly soluble in acetone and in alcohol
Identification IR: the infrared absorption spectrum exhibits maximum only at the same wavelengths as that of the standard sample
Appearance of solution Solution is clear and colorless
PH 5.0~7.0
Acidity To 10ml of solution S1 add 0.1ml of phenolphthalein solution R1,the solution is colourless,not more than 0.7 ml of 0.01M sodium hydroxide is required to change the colour of the indicator to pink
Water content ≤0.5%
Transmittance ≥97%
Water-insoluble matter ≤0.5%
Limit of 1,1-cyclobutane- dicarboxylic acid ≤0.5%
Chromatographic purity Individual impurity: ≤0.25%
All impurities: ≤0.5%
Platinum content 52.0%~53.0%
Chlorides ≤100ppm
Ammonium ≤100ppm
Silver ≤10ppm
Soluble barium ≤10ppm
Heavy metals ≤20ppm
Loss on drying ≤0.5%
Assay( HPLC) 98.0%-102.0%