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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Process liquor

Classification: Industrial -> chemical -> process liquor

Citations 2

"Automatic Continuous-flow Determination Of Sulfite In The Presence Of A High Concentration Of Thiosulfate"
Anal. Chim. Acta 1995 Volume 302, Issue 2-3 Pages 269-274
J. S. Cosano, M. D. Luque de Castro* and M. Valcárcel

Abstract: The sample was injected into water as carrier and merged with a mixture, prepared in situ, of (a) 20 µg/ml of p-rosaniline in aqueous 1.5% ethanol buffered by acetate at pH 4 and (b) 0.1 M K2HPO4 buffer of pH 7. The mixture passed through a 318 cm coil of i.d. 0.5 mm before measurement at 540 nm in a flow-through cell. Response was linear for 1-20 µg/ml of sulfite and the RSD at 7 µg/ml was 1.54% (n = 11). Sampling frequency was 40/h and up to 1 mg/ml of sulfate or thiosulfate did not interfere. With the introduction of a 1000-fold dilution step and of a single bed string reactor just before the reagent-merging point, the method was applied to solutions from a thiosulfate production plant. Peak width measurement was necessary to optimize sensitivity. Sampling frequency was 8/h and the RSD for 0.23% of sulfite in 60% thiosulfate solutions was 1.3-2.8% (n = 11).
Sulfite Spectrophotometry Interferences Optimization Process control Single bead string reactor Sensitivity Peak width

"Flow Injection Analysis Determination Of Phosphoric Acid In Phosphorization Solution"
Lihua Jianyan, Huaxue Fence 1988 Volume 24, Issue 5 Pages 305-319
Wang, S.;Mei, K.;Luo, Y.

Abstract: Phosphate solution (~1 mg mL-1; 100 µL) is fed into a flow injection analysis apparatus (Liaoning Precision Instruments) and allowed to react with 6% (NH4)6Mo7O24 - 0.6% NH4VO3 solution in 26% HNO3 to give a brilliant yellow complex, which is determined spectrophotometrically at 460 nm (details given). The coefficient of variation is 0.7% (n = 9). Results are satisfactory and compare well with those obtained by an ion exchange - neutralization method. The method is simple, and 120 samples can be analyzed in 1 h.
Phosphoric acid Spectrophotometry Method comparison