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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Classification: Industrial -> process liquor -> fertilizer

Citations 1

"Online Monitoring Of Nitrite In Fertilizer Process Streams, Natural And Wastewater Effluents With Sequential Injection Analysis"
Microchim. Acta 1998 Volume 129, Issue 1-2 Pages 33-39
Jacobus Frederick van Staden and Thomas Arnoldus van der Merwe

Abstract: A sequential injection system for the online monitoring of NO2- in fertilizer process streams, natural waters, and wastewater effluents is proposed. NO2- is diazotized in the SIA system with N-(1-naphthyl) ethylenediammonium dichloride to form a highly colored azo dye which is measured at 525 nm. The proposed system is fully computerized and is able to monitor NO2- at a frequency of 49 samples per h with a RSD of <2.7%. The calibration curve is linear ≤5 mg/L. The detection limit is 0.053 mg/L.
Nitrite Spectrophotometry Sequential injection Process monitoring Automation