Abstract
A chromophoric reagent, 2-hydroxy-3-methoxy benzaldehyde thiosemicarbazone (HMBATSC), was employed for the sensitive spectrophotometric determination of gold(III). The gold(III) ion forms a blue-coloured complex with HMBATSC in an aqueous dimethyl formamide at pH 6.0. The gold complex shows the absorption maximum at 385 nm, and Beer's law was obeyed in the range 0.49–8.37 μg mL−1. The molar absorptivity and Sandell's sensitivity were found to be L mol−1 cm−1 and 0.015 μg cm−2, respectively. The complex shows 1 : 1 [Au(III) : HMBATSC] stoichiometry with a stability constant of . The interference effect of various diverse ions has been studied. In addition to zero-order, first- and second-order derivative spectrophotometric methods were also developed for the determination of gold(III) in microgram amounts which were more sensitive than the zero-order method. The developed method has been used for the determination of gold(III) in environmental water samples and certified reference materials. The results were in excellent agreement with the certified values.
Highlights
Gold is considered to be one of the most significant noble metals due to its wide applications in industry and economic activity
Thiosemicarbazones [7,8,9,10] are one of the important classes of reagents widely employed for the spectrophotometric determination of metal ions
The developed method has been used for the determination of gold(III) in environmental water samples and reference materials
Summary
Gold is considered to be one of the most significant noble metals due to its wide applications in industry and economic activity. Gold particles are present in the bodies of fish, aquatic invertebrates, and humans It has been used in medicine, for example, to cure rheumatoid arthritis under treatment called “chrysoteraphy [sic].”. Thiosemicarbazones [7,8,9,10] are one of the important classes of reagents widely employed for the spectrophotometric determination of metal ions. Lake water 2 1.480 ∗ Average of five determinations These reagents act as good chelating agents and form complexes with various metal ions by bonding (as shown below) through thioketo sulphur and hydrazine-nitrogen atom. The present work reports the simple, sensitive, selective and nonextractive spectrometric determination of gold(III) using 2-hydroxy-3-methoxy benzaldehyde thiosemicarbazone (HMBATC) as a chromophoric reagent. The developed method has been used for the determination of gold(III) in environmental water samples and reference materials
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