Determination of cobalt in zinc electrolyte by an automated flow-injection system.
A flow-injection method has been developed for the spectrophotometric determination of cobalt in zinc electrolyte using 2-(5-bromo-2-pyridylazo)-5-(N-propyl-N-sulphopropylamino)aniline (5-Br-PSAA) as chromogenic reagent. A sample solution is injected into a carrier containing hydrochloric acid, diammonium hydrogenphosphate and hydrogen peroxide. The sample is then merged with the stream of ammonium acetate solution and PSAA solution is synclonously injected into the sample zone. After mixing with 2M sulphuric acid, the absorbance of cobalt-PSAA complex is measured at 617 nm. The flow injection system proposed is fully controlled with a personal computer. The flow-injection system permits throughput of 12 samples per hour. The relative standard deviation (n = 10) for 0.1 mug Co/ml solution is 5.0%.
Hayashibe
Y
Y
Analytical Division, Central Research Institute, Mitsubishi Materials Co., 1-297, Kitabukuro-cho, Omiya-city, Saitama, Japan.
Takeya
M
M
Sayama
Y
Y