University of North Florida
Browse the Citations

Contact Info

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

View Stuart Chalk's profile on LinkedIn


Classification: Commercial product -> photographic -> film

Citations 3

"Automated Measurement Of Dye Coverage In Photographic Negatives By Flow Injection Analysis"
Talanta 1992 Volume 39, Issue 3 Pages 313-318
Terrence P. Tougas* and Kathleen M. Hobbs

Abstract: The sample was extracted with DMSO followed by determination of the yellow, magenta and cyan dyes at 459, 554 and 678 nm, respectively. The coefficient of variation for peak-area determinations (n = 10) were 1.0 to 1.2%. A system was designed to automate the determination of three image dyes in an instant photog. material. The method involves extracting negative samples with DMSO and filtering the extract, followed by quantitating the dye coverage (dye per unit area of negative) through a spectrophotometric flow injection procedure. Significant spectral overlap exists among the dyes, and as a result calculation of coverage requires solving three simultaneous equations. A microcomputer and data acquisition system were employed for controlling the detector and flow injection system, acquiring and integrating the detector response, calculating coverage, producing and displaying control charts, and automatically transferring results to a VAX based corporate database. In addition to automating sample preparation and measurement steps as much as possible, the goal of this project was to automate the data manipulation and transfer steps.
Dyes, photographic Spectrophotometry Computer

"Determination Of Primary Aromatic Amine In Quality Control Of X-ray Contrast Media By Flow Injection Analysis"
Talanta 1996 Volume 43, Issue 6 Pages 951-955
Gro Johansen*, Kjersti Grini, Karina Langseth-Manrique and Kåre Helge Karstensenb

Abstract: X-ray contrast media containing iohexol, iopentol or iodixanol was mixed with HCl and the individual drugs were dissolved in water and HCl. Samples were then injected into a carrier stream (2 ml/min) of 7% NaCl in HCl, reagent streams (0.8 ml/min) of 1 M HCl and 0.6 mM NaNO2 merged and mixed in a knotted reaction coil (40 cm x 0.8 mm i.d.) and the reagent and carrier streams merged. After passing through a knotted reaction coil (200 cm x 0.8 mm i.d.), a reagent stream (0.8 ml/min) 0.1% N-(1-naphthyl)ethylenediamine-dihydrochloride merged and the resultant stream passed through a knotted reaction coil (50 cm x 0.8 mm i.d.) to a spectrophotometer for measurements at 511 nm. Calibration graphs were linear for the primary aromatic amine Cpd 5400 [5-amino-NN'-bis-(2,3-dihydroxypropyl)-2,4,6-tri-iodo-1,3- benzenedicarboxamide] for 4-40 µg/ml with recoveries of 81.3-101.2% and RSD (n = 12) of 2.3-17.5%.
Iohexol Iopentol Iodixanol Spectrophotometry Knotted reactor

"Fluorimetric Kinetic-FIA Determination Of Silver(I) Based On Its Catalytic Effect On The Reduction Reaction Of Safranine With Iodide"
Microchem. J. 1998 Volume 58, Issue 2 Pages 138-143
A. Safavi and M. R. Baezzat

Abstract: A sensitive kinetic fluorometric flow injection method was developed for the determination of Ag(I) over the range 100-2500 ng. The method is based on the catalytic effect of Ag(I) on the reduction reaction of safranine by iodide. Method development includes optimization of reagent concentration, pH, reaction temp., and flow variables. The optimized flow injection manifold yielded a detection limit of 50 ng of Ag(I). Chem. interference studies showed that the method also has good selectivity. The method was applied to the determination of silver in expired black and white photog. film.
Silver(I) Fluorescence Catalysis Indirect Interferences Optimization