2006•Chinese Journal of Analysis LaboratoryRequires access

Determination of trace palladium by spectrophotometric method with DBONAA

Zhou Hong-ying

Abstract

The color reaction of 3-[(2-arsonophenyl)azo]-6-[(4,6-dibromo-2-nitrophenyl)azo]-4,5-dihydroxynaphthalene-2,7-disulfonic(abbreviated as DBONAA) with Pd(Ⅱ) was studied,and a new spectrophotometric method for the determination of trace palladium was established.The color reagent reacts sensitively with Pd(Ⅱ) to form a stable pink complex(1∶2) in a medium of HCl at pH 3.0.The maximum absorption wavelength and apparent molar absorptivity are 566 nm and 1.79×10~5 L·mol~(-1)·cm~(-1) respectively.Beer's law is obeyed in the rang of 0～1.8 μg/mL for Pd(Ⅱ).The method has been applied to the determination of trace palladium with satisfactory results.

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Key concepts: Molar absorptivity, Chemistry, Palladium, Reagent, Color reaction, Spectrophotometry, Absorption (acoustics), Trace Amounts