• British Pharmacopoeia Volume V
  • Appendices
  • Appendix I A. General Reagents

Dimethyl Sulfoxide

Dimethyl Sulfoxide Dimethyl sulphoxide; C2H6OS = 78.1 (67-68-5)

Analytical reagent grade of commerce.

A colourless liquid; boiling point, about 189°; bp2012_v5_46_004_[appendix_i_a]_d_revised_texts_ep7-3 n_20_d.png, about 1.479; bp2012_v5_46_004_[appendix_i_a]_d_revised_texts_ep7-3 d_20_20.png, about 1.10.

Complies with the following test.

Water Not more than 1.0% w/v, Appendix IX C.

Dimethyl sulfoxide used in spectrophotometry complies with the following additional test.

Transmittance Not less than 10% at 262 nm, 35% at 270 nm, 70% at 290 nm and 98% at 340 nm and at higher wavelengths using water in the reference cell.