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
Email: schalk@unf.edu
Website: @unf

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M. J. Whitaker

Abbrev:
Whitaker, M.J.
Other Names:
Address:
Westinghouse Savannah River Company, Savannah River Site, Aiken, South Carolina 29808, USA
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Citations 4

"Determination Of Hydrogen Peroxide In Reactor Moderator Solutions By Flow Injection Analysis"
Talanta 1993 Volume 40, Issue 1 Pages 113-117
M. J. Whitaker

Abstract: Samples (58 µL) of heavy water moderator were fed from an autosampler via a sample loop (15 cm x 0.7 mm) to an eight-port valve, for injection into a carrier stream of 1% NaCl. At flow rates of 0.70 and 2.0 mL min-1 the sampling rates were 17 and 47 h-1, respectively. Amperometric detection of H2O2 (produced as a radiolysis by-product) gave a calibration graph which was rectilinear in the range 0.10 to 2.50 µg mL-1 at a flow rate of 1.30 mL min-1. In the determination of 0.10 and 2.50 µg mL-1 standards, the coefficient of variation were 0.5% and 0.3%, respectively (n = 5). Compared with a manual method, the technique showed a reduction in analysis time of 21 min and the total liquid waste generated per sample was reduced by 95%. A modified technique for the combined analysis of H2O2 and B is also described.
Hydrogen peroxide Boron Amperometry

"Spectrometric Determination Of Nonionic Surfactants By Injection Analysis Utilizing Ion-pair Extraction And An Improved Phase Separator"
Anal. Chim. Acta 1986 Volume 179, Issue 1 Pages 459-462
M. J. Whitaker

Abstract: The ion pair formed between a polyoxyethylene glycol monoether surfactant and the K salt of tetrabromophenolphthalein ethyl ester at pH 9.3 is extracted into 1,2-dichloroethane. The absorbance of the organic layer is measured at 609 nm. The range for Triton X-100 is 2 to 60 mg L-1 and the coefficient of variation at the 3 and 50 mg L-1 levels are 0.87 and 0.49%, respectively (n = 10).
Surfactants, non ionic Spectrophotometry Sample preparation Ion pair extraction Phase separator Tecator Triton X Surfactant

"Determination Of Total Chromium By Flow Injection Analysis"
Anal. Chim. Acta 1985 Volume 174, Issue 1 Pages 375-378
M. J. Whitaker

Abstract: The Cr(III) is oxidized to Cr(VI) with Ce(IV) and HNO3 in a reaction coil immersed in a water bath at 80°C, 1,5-diphenylcarbazide is added and the absorbance of the Cr(VI) complex is measured at 540 nm. The peak height varies rectilinearly with Cr concentration. from 0.5 to 10 mg l-1. The mean recovery for ten 5 mg L-1 standards of Cr(III) was 4.96 mg L-1 with a coefficient of variation of 0.8%; for corresponding Cr(VI) standards the corresponding data were 4.94 mg L-1 and 0.61%. Sampling rates were 40 h-1 in both instances. Peristaltic pumping was used, with dual-channel injection. Flow rates for the sample, carrier and reagent streams were 1.2 mL min-1.
Chromium, total Water Spectrophotometry Heated reaction

"Industrial Applications Of Flow Injection Analysis"
Am. Lab. 1986 Volume 18, Issue 3 Pages 154-157
Whitaker, M.J.

Abstract: Some of the advantages and uses of flow-injection analysis in industry are reviewed with three references. (SFS)
Industrial Process control Review