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

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Commercial product

Classification: Commercial product -> paper

Citations 2

"Porous Layer Flow Injection Analysis With Potentiometric Chloride Detection"
Talanta 1994 Volume 41, Issue 10 Pages 1771-1774
Q. Yin and C. O. Huber*

Abstract: A FIA system is described (schematic diagram given) where the carrier solution stream consisted of a 0.5 cm wide strip of 2-layer porous paper (toilet tissue) 90 µm dry thickness and 12 cm length resting on a polymethacrylate surface. The carrier stream flow was by capillary action using a folded porous paper pump (3 x 12 cm area) at the downstream end. Sample was applied by manual deposition of a droplet from a microsyringe into the carrier stream. A potentiometric Ag disc electrode as an indicator electrode was placed under the porous bed and an Ag/AgCl reference electrode was placed in the feed reservoir of the carrier solution. The potential was measured with a pH meter. The system was used for the determination of chloride with a range of 0.1-1000 mM with a detection limit of 50 µM-chloride.
Chloride Potentiometry Electrode

"Determination Of Anthraquinones In Pulping Materials By High Performance Liquid Chromatography Using Online Post-column Derivatization"
J. Chromatogr. A 1985 Volume 328, Issue 1 Pages 309-315
Nobutoshi Kiba, Motoharu Takamatsu and Motohisa Furusawa

Abstract: A selective assay for anthraquinones in black liquors and paper, based on their reduction by Na2S2O4 to anthraquinols, was developed. The anthraquinones were extracted with cyclohexane (from liquors) or CH2Cl2 (from paper) and portions of the extract were analyzed on a column (25 cm x 4.6 mm) packed with Jasco Finepak SIL C18 (10 µm), with acetonitrile - 0.3 mM HCl (7:3) as mobile phase (0.75 mL min-1) and mixing of the eluate with 0.2 M S2O42- in 0.5 M NaOH (at 0.5 mL min-1) and water (at 0.25 mL min-1), followed by passage of the mixture through a PTFE tube (100 cm x 0.5 mm) at 30°C and measurement of the absorbance at 500 nm. The method is applicable for 0.3 to 80 nmol of anthraquinones in 50 µL of injected sample. Mixtures of anthraquinone and four of its derivatives at ppm levels were analyzed by the proposed method, which is less sensitive than conventional HPLC methods.
Anthraquinone HPLC Spectrophotometry Heated reaction Post-column derivatization