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: Plant -> hay -> lucerne

Citations 1

"Extractable Sulfate-sulfur, Total Sulfur And Trace-element Determinations In Plant Material By Flow Injection Analysis. 2. Total Sulfur And Copper, Zinc, Manganese And Iron In Plant Material"
Anal. Lett. 1990 Volume 23, Issue 4 Pages 675-702
D. L. Heanes

Abstract: Oven-dried samples (200 to 500 mg) were digested (at 100 samples per day) with HNO3 containing HClO, NH4NO3 and CaCl2 in a Pyrex tube at 60°C to 220°C (details given). The cooled digest was diluted to 15 mL with water and a flow injection analysis (FIA) system was used for the turbidimetric determination of total S in the supernatant solution, with the use of aqueous 0.01% Brij 35 as carrier solution, aqueous 1% Na ascorbate as sample diluent, and 0.25% of Na2EDTA in 0.1 M NaOH and 11% of BaCl2.2H2O in 1% gum arabic as reagent solution (valve switch timing sequence given). The throughput rate was 120 samples h-1. Calibration graphs were rectilinear for 1 to 200 mg mL-1 of sulfate-S in 0.25 M HClO4. The detection limit was 8 mg kg-1 in plant material. In the determination of 100 mg L-1 of sulfate-S in 0.254HClO4 and the analysis of kale, lucerne hay and oat grain, the coefficient of variation was 0.7% (n = 10). The recovery of 0.2% of S in plants was 97 to 104%. There was no interference from 6% of Ca, 5% of Mg, Na or K, 2.5% of Si, or 0.5% of P or N. A procedure for the FIA of Zn, Mn, Cu and Fe with AAS detection was also described.
Sulfate Sulfur Copper Zinc Manganese Iron Sample preparation Spectrophotometry Turbidimetry Dilution Calibration Detection limit Interferences