Abstract
2-Mercaptosuccinic acid (MSA)-capped gold nanoparticles (GNPs) were used to determine the level of concentration of lead and cadmium metals in various environmental samples. Alumina-coated MSA-capped GNPs easily remove lead and cadmium present in various samples. The absorbance spectrum was obtained at 547 nm. Effects of pH, reagent concentration, interferences, were studied. This method is simple, selective and successfully applied for the determination of lead and cadmium species in various water samples collected in and around four industries.
Highlights
Gold nanoparticles (GNPs) play a vital role in environmental science and chemistry, because of its large surfaceto-volume ratio, quantum confinement, stability and other unique properties
The column was filled with 5 g of MSAcapped GNP-coated alumina and to this 1.0 mg L-1 of each lead and cadmium solution was passed at a flow rate of 5 mL min-1; 5 mL of the treated water was collected at an interval of 100 mL and analysed following flame atomic absorption spectrophotometry (FAAS)
It is noted that Mercaptosuccinic acid (MSA) is a stronger capping agent for GNPs which facilitates further homogeneous and strong capping with the surface-assisted reduction for growth, which is favourable for suppressing the difference in surface reduction on different particles
Summary
Gold nanoparticles (GNPs) play a vital role in environmental science and chemistry, because of its large surfaceto-volume ratio, quantum confinement, stability and other unique properties. The author successfully synthesised and applied GNPs capped with 2-mercaptosuccinic acid (MSA) for the determination of lead and cadmium present in various environmental water samples, which were collected from selected industrial areas. GNPs capped with MSA determined lead and cadmium up to ppb levels in real water samples following flame atomic absorption spectrophotometry (FAAS). The column was filled with 5 g of MSAcapped GNP-coated alumina and to this 1.0 mg L-1 of each lead and cadmium solution was passed at a flow rate of 5 mL min-1; 5 mL of the treated water was collected at an interval of 100 mL and analysed following flame atomic absorption spectrophotometry (FAAS). GNPs were synthesised by citrate reduction of gold chloride (HAuCl4Á3H2O) solution mixed with trisodium citrate following Turkevich method; 5 mL of 1 M HAuCl4.3H2O was diluted with 90 mL of double-distilled water and heated until it began to boil. The structural and morphological changes of MSA-capped GNPs were determined by using SEM and transmission electron microscopy (TEM)
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