Dimethyl sulphoxide Ph.Eur 2.5KG Go Back


: 67-68-5

Molecular Formula

: C2H6OS

Molecular Weight

: 78.13
Appearance: A colourless liquid or colourless crystals, hygroscopic.
Solubility: Miscible with water and with ethanol (96%).
Identification A ( By Relative density, 20°C): 1.100-1.104
Identification B (By Refractive index, 20±0.5°C): 1.478-1.480
Identification C (By IR): IR spectra of the sample should be concomittant with IR spectra of the corresponding standard
Identification D (By Chemical test): The colour changes to green or bluish-green. Cool. The colour changes to greenish-yellow.
Acidity: Not more than 5.0ml of 0.01M sodium hydroxide is required to produce a pink colour.
Relative density (20°C): 1.100-1.104
Refractive index (20°C ± 0.5°C): 1.478-1.480
Freezing point: Min. 18.3°C
UV absorbance profile (10mm cell)@275nm: NMT 0.30
UV absorbance profile (10mm cell)@285nm: NMT 0.20
UV absorbance profile (10mm cell)@295nm: NMT 0.20
UV absorbance profile (10mm cell)@270nm-350nm: The substance to be examined shows no absorption maximum.
Related substances, unspecified impurities: NMT 0.10%
Related substances, total impurities: NMT 0.15%
Water: NMT 0.2%
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