Title: Chromogenic Reaction of 2-(2,3,5,-triazolylazo)-1,8-dihydroxynaphthalene-3,6-disulfonic Acid with Cobalt and Its Application
Abstract: The condition of the chromogenic reaction of 2 (2,3,5, triazolylazo) 1,8 dihydroxynaphthale 3,6 disulfonic acid with cobalt is studied. The experimental results show that in Na 2B 4O 7 NaOH (pH 9.9) buffer solution, cobalt reacts with 2 (2,3,5, triazolylazo) 1,8 dihydroxynaphthale 3,6 disulfonic acid and forms a stable blue complex (1∶1) in pH 9.9, the apparent molar absorbance is 3.46×10 4?L·mol -1 ·cm -1 at λ max =588.8 nm,Beer's law is obeyed in concentration range of 0~1.0 mg/L for cobalt . The method has been applied to the direct determination of trace cobalt in environmental water and vitamin B 12 injection. The results are in good agreement with those obtained by AAS method with precision of 1% RSD ( n =5).
Publication Year: 2002
Publication Date: 2002-01-01
Language: en
Type: article
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