2003•Trace Elements ScienceRequires access
Catalytic Spectrophotometric Determination of Cobalt with dibromxcarboxyarsenazo
Yajun Zhang
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Abstract
A study is made in the sodium tetraborate-sodium hydroxide buffer solution,the synergistic effect of trace amounts of cobalt(Ⅱ)and triethanolamine on the oxidation of dibromxcarboxyarsenazo by hydrogen peroxide.λ max =570 nm,the apparent molar absorption coefficient is 3 7×10 4·L·mol -1 cm -1 and the linear range for the determination of cobalt is 1 5～4 0 μg/25mL.The method has been applied to the determination of trace amounts of cobalt in tea.