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 -> paper -> process liquor

Citations 1

"Spectrophotometric Determination Of Calcium In Paper Machine White Water By Sequential Injection Analysis"
Anal. Chim. Acta 1995 Volume 308, Issue 1-3 Pages 286-292
Johan Nyman and Ari Ivaska*

Abstract: The determination of Ca in white water of a paper machine was based on the formation of the colored complex between Ca2+ and o-cresolphthalein complexone (CPC). White water samples were centrifuged at 1500 rpm for 30 min and the clear supernatant solution was used for the Ca2+ determination. The analysis was carried out on a computer-controlled sequential analysis system comprising of a peristaltic pump, a 10 port multi-position valve, a holding coil (1.5 m x 0.9 mm i.d.), a reaction coil (60 cm x 0.5 mm i.d.) and a spectrophotometric detector equipped with a sandwich-type flow-through cell (30 µL; 3 mm light path). The detection wavelength was 580 nm and flow-rates of 3.3-3.5 ml/min were used. The analysis was carried out by aspirating sample solution from the holding coil for 0.5 s (30 µL) followed by 2.5 mg/ml 8-hydroxquinoline solution for 1 s (60 µL) and 0.24 mM CPC for 1 s (60 µL). The mixture was pumped through the detection cell. The calibration graph was linear for 10^-500 mg/l Ca and the RSD (n = 5) was 2.5% within the linear range.
Calcium Spectrophotometry Sequential injection Complexation Computer