Spectrophotometric and colorimetric determination of gallium (III) with p-aminohippu- ric acid-functionalized citrate capped gold nanoparticles

Abstract

A new technique for sensing Ga(III) concentration based on polyvinyl alcohol-citrate capped gold nanoparticle-p-aminohippuric acid hybrid (or three-layer core-shell configurations) have been demonstrated. The p-aminohippuric acid capped citrate-gold nanoparticles were comfortably agglomerated in the presence of Ga(III) and the color of the reaction quickly turned from red to violet or blue. Under the detection conditions, a good linear relationship was ideally obtained between the ratio of the absorbance intensity at 620 nm to that at 520 nm (A 620 /A 520 ). The linear response range, the detection and quantification limit was 34.9-418.3 µg/L and 7.6 µg/L and 25 µg/L, respectively. To reflect the accuracy, the developed sensing approach was evaluated 2 against certified reference materials (TMDA 51.3 fortified water and TMDA 28.3 fortified water). This colorimetric strategy was displayed excellent selectivity for Ga(III) over other examined ions. Additionally, the colorimetric method was properly used to detect the concentrations of Ga in tap water and certified reference material samples with recoveries ranging from 95.4 to 102.0%, displaying that the colorimetric procedure could be safely used for a realistic application.

Using a Simple Magnetic Adsorbent for the Preconcentration and Determination of Ga(III) and In(III) by Electrothermal Atomic Absorption Spectrometry

“…Ga(III) can be determined by molecular absorption spectrometry using ligands that form compounds with high molar absorptivity [ 20 , 21 , 22 , 23 ], whose sensitivity can be improved by coupling to a liquid- [ 24 ] or solid-phase extraction procedure [ 25 ]. If the compound resulting from the interaction of Ga(III) with the ligand emits fluorescence, sensitivity is further enhanced [ 26 ].…”