2,3-Dichloro-6-(3-carboxy-2-hydroxy-1-naphthylazo)quinoxaline as an Analytical Reagent for the Spectrophotometric Determination of Microamount of Gold(III)

Autor:	S. Shakra, Alaa S. Amin, A. A. Abdalla
Rok vydání:	1994
Předmět:	Bicyclic molecule Extraction (chemistry) Color reaction Analytical chemistry General Chemistry Molar absorptivity Metal chemistry.chemical_compound Quinoxaline chemistry visual_art Reagent visual_art.visual_art_medium Stoichiometry Nuclear chemistry
Zdroj:	Bulletin of the Chemical Society of Japan. 67:1286-1289
ISSN:	1348-0634 0009-2673
DOI:	10.1246/bcsj.67.1286
Popis:	The synthesis, spectral characteristics, and analytical application of 2,3-Dichloro-6-(3-carboxy-2-hydroxy-1-naphthylazo)quinoxaline (DCHNAQ) are described. A simple, rapid, selective, and sensitive spectrophotometric method for the determination of microgram amounts of gold, alone, or in the presence of associated metals, is developed, based on the color reaction between the metal ion and the reagent. The yellowish brown complex (λmax = 575 nm) has stoichiometric ratio (1 : 1) [metal : ligand] over the pH range 3.4 to 7.0. Beer’s law is obeyed over the concentration range 0.1—6.9 μg cm−3 of gold. The molar absorptivity and Sandell’s sensitivity of the method are 1.52 × 104 dm3 mol−1 cm−1 and 0.016 μg Au cm−1 respectively. The relative standard deviation for six replicate determination of 2.95 μg cm−3 of gold(III) is 1.37%. The interference of various ions has been studied and conditions were developed for the determination of gold in alloys and some synthetic samples without the need for extraction or he...
Databáze:	OpenAIRE
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