![Spectrophotometric determination of potassium in river water based on solvent extraction of the complex formed with a crown ether and an anionic azo dye using flow injection]()
Spectrophotometric determination of potassium in river water based on solvent extraction of the complex formed with a crown ether and an anionic azo dye using flow injectionMotomizu, Shoji; Onoda, Minoru; Oshima, Mitsuko; Iwachido, Tadashi · The Analyst · 1988