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

Tetrahydrofuran
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Tetrahydrofuran Tetramethylene oxide; C4H8O  =  72.11 (109-99-9)

Analytical reagent grade of commerce.

A clear, colourless, flammable liquid; boiling point, about 66°; bp2010_v4_02_05_appendix_i_1a_s d_20_20.png, about 0.89.

Do not distil unless it complies with the following test.

Peroxides Place 8  ml of potassium iodide and starch solution in a ground-glass-stoppered cylinder with a capacity of 12  ml and about 1.5  cm in diameter and add sufficient of the substance being examined to fill the cylinder completely, shake vigorously and allow to stand for 30 minutes protected from light. No colour is produced.

Tetrahydrofuran used in spectrophotometry complies with the following additional requirement.

Transmittance Not less than 20% at 255  nm, 80% at 270  nm and 98% at 310  nm determined using water in the reference cell.