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 -> synthetic

Citations 1

"Online Precipitation In Flow Injection Atomic Absorption Spectrometry"
Anal. Proc. 1989 Volume 26, Issue 11 Pages 375-377
C. E. Adeeyinwo and J. F. Tyson

Abstract: A flow injection manifold designed for oxalate precipitation was used to separate Ca from synthetic rock sample solution containing Al, Si and P (as interferents) before flame AAS analysis at 422.7 nm. The reactor - filter unit was a mini-column of polystyrene granules (35 to 44 mesh) packed in a PTFE tube (5 cm x 3 mm) fitted with a membrane filter (pore size 0.2 µm). The carrier was water, the precipitation reagent was aqueous 0.05 M NH3 containing ammonium oxalate (50 mg l-1), and the eluent for the pptd. Cd was 5% HCl. For a 140 µL injected sample the calibration graph was rectilinear up to 4 mg L-1 of Ca, and the sensitivity and detection limit were 0.083 and 0.25 mg l-1, respectively; sample throughput was 12 h-1. An enrichment factor of >650 was obtained for determination of 1 ng mL-1 of Ca by pre-concentration. from a 10 mL sample; throughput was then two samples h-1.
Calcium Spectrophotometry Precipitation Polystyrene beads Filter Interferences