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: Geological -> rock -> sedimentary

Citations 1

"Continuous-flow Analysis: Simultaneous Spectrophotometric Determination Of Metals"
Anal. Chim. Acta 1995 Volume 308, Issue 1-3 Pages 386-396
Yu. A. Zolotov, E. I. Morosanova*, S. V. Zhalovannaya and S. S. Dyukarev

Abstract: Continuous-flow analysis methods for the simultaneous determination of (i) aluminum and manganese, (ii) aluminum and iron(III) and (iii) calcium and magnesium were developed. The methods were based on ligand-exchange reactions or reactions at different rates. For (i) the Al and Mn complexes with xylenol orange (XO) were formed and the combined adsorption was measured at 570 nm in the first detection cell. EDTA was added to the flow system to destroy the Mn-XO complex and allow the Al-XO complex to be determined in the second detection cell at 550 nm. A similar methodology was used for (iii) using eriochrome black T (EB) to determine the combined Ca and Mg concentration at 540 nm. EDTA was added to destroy the Ca-EB complex and allow the Mg-EB complex to be determined also at 540 nm. The different rate of reaction with XO were utilized for (ii). The signal recorded in the first cell at 560 nm was due to the Fe-XO complex while that recorded in the second cell at 550 nm was due to the combined absorption of the Fe-XO and Al-XO complexes. The full details of each method are presented along with the linear ranges and detection limits. The methods were tested on synthetic and real samples (soil extracts, sedimentary rocks). High accuracy and good precision were obtained with RSD of 1-6.5%. The sampling frequency was up to 32 samples/h.
Aluminum Calcium Manganese Magnesium Iron(III) Spectrophotometry Sample preparation Complexation Segmented flow Kinetic