Spectrophotometric determination of germanium based on its ternary complex with phenylfluorone and zephiramine |
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| Affiliation: | 1. Department of Applied Chemistry, Graduate School of Engineering, Osaka University, Yamada-oka, Suita, Osaka 565-0871, Japan;2. Osaka R&D Laboratory, Daihachi Chemical Industry Co., Ltd., 3-5-7 Chodo, Higashiosaka, Osaka 577-0056, Japan;1. Department of Chemistry, Faculty of Arts and Sciences, Bozok University, 66900 Yozgat, Turkey;2. Department of Chemistry, Faculty of Sciences, Erciyes University, 38039 Kayseri, Turkey |
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| Abstract: | A sensitive Spectrophotometric method for the determination of germanium based on its ternary complex with phenylfluorone and zephiramine was developed. The complex forms in 0.3–1.5 M HCl medium. Maximum absorbance is obtained for the molar ratio of Ge:PF:zeph = 1:16:600. Molar absorptivity (ϵ) is 1.38 × 105 liters mol−1 cm−1 at λmax = 505 nm. Due to the limited selectivity of the method (Sn, Sb, Nb, Ta, Ti, V, Mo, ClO4−, SO42−, PO43−) before determining trace amounts of germanium, it should be separated, e.g., by extraction. Germanium in galman ore was determined with the developed method (about 1 × 10−3%). Attempts to achieve satisfactory analytical results failed in the presence of cetyltrimethylammonium ions or cetylpyridinium ions used as cationic surfactants. |
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