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

• Published in: New journal of chemistry Vol. 46; no. 7; pp. 3178 - 3184
• Main Authors: Cang, Jinshun, Gu, Weixi, Zhang, Yuheng, Zhu, Xiashi
• Format: Journal Article
• Published: 14.02.2022
• ISSN: 1144-0546; 1369-9261
• DOI: 10.1039/d1nj04917h

Magnetic graphene oxide coated with amino acid ionic liquid (Fe 3 O 4 -SiO 2 -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 Fe 3 O 4 -SiO 2 -GO-AAIL at pH 9.0. Under the optimum conditions, the developed method provides linear ranges from 6.0 to 650.0 μg L −1 for Cr( iii ) and from 3.0 to 350.0 μg L −1 for Cr( vi ). The limits of detection (LODs) are 0.406 and 0.186 μg 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. This developed method, based on the combination of functionalized Fe 3 O 4 -SiO 2 -GO-AAIL and ICP-OES, is capable of remarkable selectivity towards Cr( iii ).