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Spectrophotometry Determination of Cobalt after Extraction of its Ternary Complex with 3‐(4‐Phenyl‐2‐Pyridyl)‐5,6‐Diphenyl‐1,2,4‐Triazine and Tetraphenylborate into Molten Naphthalene
Author(s) -
Lin JennLin
Publication year - 1984
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.198400056
Subject(s) - chemistry , tetraphenylborate , cobalt , naphthalene , spectrophotometry , acetonitrile , molar absorptivity , extraction (chemistry) , ternary complex , triazine , inorganic chemistry , reagent , nuclear chemistry , chromatography , organic chemistry , ion , physics , optics , enzyme
The reaction of 3‐(4‐phenyl‐2‐pyridyl)‐5,6‐diphenyl‐1,2,4‐triazine (PPDT) and tetraphenylborate (TPB) with cobalt (II) has been studied to determine the optimum conditions for the extraction and quantitative spectrophotometry determination of this metal. The ternary complex is extracted into molten naphthalene at p H 3.6–7.4. The solid naphthalene containing the cobalt associated complex is separated by filtration and dissolved in acetonitrile. Beer's law is obeyed in the concentration range 8–140 μg cobalt in 10 ml of acetonitrile solution. The molar absorptivity and sensitivity are 4.2×10 3 l·mol −1 · cm −1 and 0.01408 μ g/cm 2 , respectively. The other factors such as p H, amounts of reagents and naphthalene, shaking and standing times, and the effect of diverse ions are studied. The method has been applied to the determination of cobalt in iron steel alloys.