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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Inorganic compound

Citations 2

"Spectrophotometric Determination Of Sulfate In Sodium Hydroxide Solutions By Flow Injection Analysis"
Anal. Chim. Acta 1984 Volume 156, Issue 1 Pages 313-317
E. A. Jones

Abstract: The method is based on the catalytic effect of SO42- on the reaction between Zr and methylthymol blue(I). Under optimum conditions, the test solution (100 µL) is injected into a stream of 80 µM-I in 0.6 M HCl (1.2 mL min-1), which is then mixed with 800 µM-ZrOCl2 in 50 mM HCl (1.2 mL min-1). The mixture is passed through a 4-m reaction coil and the absorbance of the resulting complex is monitored at 586 nm (e = 20,000). The calibration graph is rectilinear for 0.05 to 0.5 g L-1 of SO42-, with a coefficient of variation of ~2%. Results for 10 batches of 1 M sodium hydroxide agreed well with those obtained by ion chromatography and by gravimetry. Twenty samples can be analyzed per h.
Sulfate Spectrophotometry Catalysis Optimization

"FAAS Determination Of Copper And Nickel In Caustic Soda (sodium Hydroxide) With Preconcentration By FIA-coprecipitation"
Lihua Jianyan, Huaxue Fence 1996 Volume 32, Issue 1 Pages 16-18
Zhang Yanlin

Abstract: Sample (10-20 g) was treated dropwise with concentrated HCl to pH 2-3, the cooled solution was mixed with 2.5 mL 100 µg/ml Fe3+, 5 mL 40% NaOH and water was added to 50 mL. The resulting solution was pumped into the flow injection system (described). Cu2+ and Ni2+ were pre-concentrated by coprecipitation with Fe(III) hydroxide. The precipitate was retained on a filter and Cu2+ and Ni2+ were eluted with 2 M HCl and determined by flame AAS at 324.8 and 232 nm, respectively, with corresponding sampling rates of 30 and 60 per h. RSD and recoveries were 6.2% (n = 6) and 98.5%, respectively, for Cu and 3.2% (n = 5) and 95.3%, respectively, for Ni.
Copper(II) Nickel(II) Spectrophotometry Preconcentration Coprecipitation Filter