PH-controlled sensitive and selective detection of Cr(iii) and Mn(ii) by using clove (S. aromaticum) reduced and stabilized silver nanospheres. Issue 6 (22nd January 2016)

• Record Type: Journal Article
• Authors: Joshi, Priyanka; Nair, Manjula; Kumar, Dinesh
• Is Part Of: Analytical methods. Volume 8:Issue 6(2016)
• Page Start: 1359
• Page End: 1366
• Publication Date: 2016-01-22
• Subjects: Chemistry, Analytic -- Periodicals; Analytical biochemistry -- Periodicals; Chemical laboratories -- Standards -- Periodicals; 543.1905
• DOI: 10.1039/c5ay03217b
• Languages: English
• ISSNs: 1759-9660

Abstract

Abstract : The colorimetric detection of Cr(iii ) and Mn(ii ) ions based on silver nanospheres (SNSs). Abstract : The colorimetric detection of toxic metal ions based on silver nanoparticles (AgNPs) has received significant attention due to their distance dependent optical properties. Our study reports a new, green, selective and sensitive colorimetric detection method for Cr(iii ) and Mn(ii ) by using clove silver nanospheres (C-SNSs) synthesized at two different pH values 4.5 and 11.5. At pH 4.5, C-SNSs gradually aggregated in the presence of Cr(iii ) ions and showed a color change from light yellow to colorless. At pH 11.5, they showed rapid aggregation, not only with a colorimetric change from dark yellow to reddish brown, but also with an alteration in the morphology of spheres to square pyramidal in the presence of Mn(ii ) ions. Cr(iii ) and Mn(ii ) ions were detected using colorimetry and spectrometry. Under optimized conditions, our method showed better selectivity for Cr(iii ) and Mn(ii ) ions as compared to other metal ions. The lowest limit of detection (LOD) of C-SNSs was 0.20 μM for both Cr(iii ) and Mn(ii ), which is significantly lower than the Environmental Protection Agency (EPA) permissible limits of 1.92 μM for Cr(iii ) and 0.91 μM for Mn(ii ).