Fe3O4-SiO2-graphene oxide-amino acid ionic liquid magnetic solid-phase extraction combined with inductively coupled plasma optical emission spectrometry for speciation of Cr(iii) and Cr(vi) in environmental water

Magnetic graphene oxide coated with amino acid ionic liquid (Fe3O4-SiO2-GO-AAIL) as a solid extractant combined with inductively coupled plasma optical emission spectrometry (ICP-OES) has been developed for the speciation analysis of Cr(iii) and Cr(vi) in water samples. Cr(iii) could be selectively extracted on Fe3O4-SiO2-GO-AAIL at pH 9.0. Under the optimum conditions, the developed method provides linear ranges from 6.0 to 650.0 mu g L-1 for Cr(iii) and from 3.0 to 350.0 mu g L-1 for Cr(vi). The limits of detection (LODs) are 0.406 and 0.186 mu g L-1 for Cr(iii) and Cr(vi), respectively, with an enrichment factor of 25.7. This approach has been validated through the quantitation of Cr(iii) and Cr(vi) in environmental water samples, with satisfactory recoveries in the range of 88.3-106.2% for Cr(iii) and 82.9-111.8% for Cr(vi). This developed magnetic solid phase extractant coupled with ICP-OES method shows a promising future in the field of environmental remediation.

Automated summary

This study developed a magnetic solid extractant coated with amino acid ionic liquid and graphene oxide for the speciation analysis of Cr(iii) and Cr(vi) in water samples using ICP-OES. The method showed good linear ranges and detection limits under optimal conditions, and its effectiveness was validated through quantitative analysis of environmental water samples. This method reveals promising potential in the field of environmental remediation.