University of North Florida
Browse the Citations
-OR-

Contact Info

Stuart Chalk, Ph.D.
Department of Chemistry
University of North Florida
Phone: 1-904-620-1938
Fax: 1-904-620-3535
Email: schalk@unf.edu
Website: @unf

View Stuart Chalk's profile on LinkedIn

Contact lens

Citations 2

"Kinetic FIA Determination Of Mercury(II) Based On Its Catalytic Effect On The Reaction Between Safranin And Iodide"
Anal. Lett. 1996 Volume 29, Issue 5 Pages 807-819
Afsaneh Safavi; Mohammad Reza Baezzat

Abstract: A schematic diagram of the FIA manifold is given. Safranin-buffer solution of pH 5 (0.75 ml/min) was merged with iodide solution in a 1 m coil. The sample (300 µL) was injected into a carrier stream of water (0.75 ml/min) and merged with the safranin-buffer - iodide mixture in a 5 m coil at 10°C. The stream from the reaction coil was measured at 520 nm. The detection limit was 90 ng Hg(II). There was little chemical interference. The method was applied to the determination of Hg in contact lens cleaning solution and hair.
Mercury(II) Spectrophotometry Interferences Kinetic

"Flow Injection Analysis And Manual Batch Procedures For The Spectrophotometric Determination Of Mercury Using Bromide And Crystal Violet As Reagents"
Int. J. Environ. Anal. Chem. 1988 Volume 32, Issue 2 Pages 97-108
Hernandez Cordoba, M.;Navarro, P.;Lopez Garcia, I.

Abstract: The flow injection single-channel manifold system includes a Gilson HP8 peristaltic pump and a Hellma 18 µL flow cell. The sample is mixed with the carrier solution (1.5 mL min-1), which contains aqueous crystal violet (C. I. Basic Violet 3), poly(vinyl alcohol), Na acetate - acetic acid buffer (pH 5) and KI. The Hg(II) forms an ion pair complex with Br- and crystal violet (e = 71,500), and the absorbance response at 664 nm is rectilinear from 0.2 to 4 µg mL-1 of Hg(II). For 0.8 µg mL-1 the coefficient of variation was 0.5% (n = 10). Absorbance of the complex is stable for 24 h. Tolerance to 35 tested anions and cations was 50-fold at 2 µM-Hg. The method was applied in the analysis of cleaning solution for contact lenses, in which Hg is present as organomercury compounds; results agreed with the certified values.
Mercury(II) Spectrophotometry Complexation Interferences Reference material Speciation