Musa Ahmad Musa bin Ahmad Colorimetric methods for the determination of hydroquinone and p-benzoquinone extrated from red phosphorus and charcoal supports / by Musa b. Ahmad - Manchester : University of Manchester , 1987 - 83 p. : ill. ; 30 cm. Thesis (M. Sc.) - University of Manchester, 1987 Subjects--Topical Terms: Colorimetric analysis