HIGHLY SELECTIVE AND SENSITIVE DETERMINATION OF Cr6+ (nM) IN GELATIN CAPSULE USING AgF/Ag2WO4 NANOCOMPOSITEAbstract
The present work deals with a novel synthesis of AgF/Ag2WO4 nanocomposite by co-precipitation method. The morphology and size of the synthesized AgF/Ag2WO4 nanocomposite were confirmed by Ultraviolet-Visible (UV-Vis) spectroscopy, Fourier Transform-Infrared (FT-IR) spectroscopy, Transition Electron Microscopy (TEM) and X-Ray Diffraction (XRD) analyses. The performance of the nanocomposite was successfully evaluated for Cr6+ detection in a gelatin capsule, which indicated that this convenient and sensitive material offered great promise for onsite environmental monitoring of Cr6+. Control experiments with the addition of over 10 other metal ions (Na+, K+, Mg2+, Fe2+, Hg2+, Ca2+, Cu2+, Ni2+, Mn2+, Zn2+) did not result in a distinct change in the colour or in the spectrum of the suspension which indicated that these ions did not interfere in the colorimetric determination of Cr6+ in gelatin capsule. The detection concentration of Cr (VI) ranged from 0.5 mg to 1.0 mg, and the detection limit was 2 nM.