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- [32] Preconcentration of trace vanadium with the ion pair of 2-nitroso-1-naphthol-4-sulfonic acid and tetradecyldimethylbenzyl-ammonium chloride onto microcrystalline naphthalene and determination by derivative spectrophotometry IRANIAN JOURNAL OF CHEMISTRY & CHEMICAL ENGINEERING-INTERNATIONAL ENGLISH EDITION, 1999, 18 (02): : 64 - 71
- [34] Derivative UV-visible spectrophotometric determination of nickel in alloys and biological samples after preconcentration with the ion pair of 2-nitroso-1-naphthol-4-sulfonic acid and tetradecyldimethylbenzylammonium chloride onto microcrystalline naphthalene or by a column method ANALYTICA CHIMICA ACTA, 1998, 367 (1-3) : 55 - 61