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2002•Chinese Journal of Spectroscopy LaboratoryRequires access

Spectrophotometric Determination of Cobalt with 5-(2-Benzothiazoleazo)-8-Aminoquinoline

Shu Zhao, Xia Xin

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Abstract

A sensitive spectrophotometric method for determination of cobalt by chromogenic reagent 5-(2-benzothiazoleazo)-8-aminoquinoline (BTAQ) was developed.In the presence of CTMAB and borax buffer solution, cobalt forms a blue 1∶2 (metal∶ligand) complex with BTAQ. The molar absorptivity is 1.24×10 5L·mol -1·cm -1at 650 nm. Beers law is obeyed for cobalt in the concentration range 0-10μg/25 mL of solution. Trace amounts of cobalt in VB 12 and drainage sediment samples have been determined by the method with satisfactory results.

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What this paper is about

A sensitive spectrophotometric method for determination of cobalt by chromogenic reagent 5-(2-benzothiazoleazo)-8-aminoquinoline (BTAQ) was developed.In the presence of CTMAB and borax buffer solution, cobalt forms a blue 1∶2 (metal∶ligand) complex with BTAQ. The molar absorptivity is 1.24×10 5L·mol -1·cm -1at 650 nm. Beers law is obeyed for cobalt in the concentration range 0-10μg/25 mL of solution. Trace amounts of cobalt in VB 12 and drainage sediment samples have been determined by the method with satisfactory results.

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Available abstract

A sensitive spectrophotometric method for determination of cobalt by chromogenic reagent 5-(2-benzothiazoleazo)-8-aminoquinoline (BTAQ) was developed.In the presence of CTMAB and borax buffer solution, cobalt forms a blue 1∶2 (metal∶ligand) complex with BTAQ. The molar absorptivity is 1.24×10 5L·mol -1·cm -1at 650 nm. Beers law is obeyed for cobalt in the concentration range 0-10μg/25 mL of solution. Trace amounts of cobalt in VB 12 and drainage sediment samples have been determined by the method with satisfactory results.

Key concepts: Cobalt, Molar absorptivity, Reagent, Chromogenic, Borax, Chemistry, Metal, Spectrophotometry

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