University of North Florida
Browse the Citations
-OR-

Contact Info

Stuart Chalk, Ph.D.
Department of Chemistry
University of North Florida
Phone: 1-904-620-1938
Fax: 1-904-620-3535
Email: schalk@unf.edu
Website: @unf

View Stuart Chalk's profile on LinkedIn

Leachates

Classification: Environmental -> soil -> leachates

Citations 3

"Use Of The Anion-exchange Resin Amberlite IRA-93 For The Separation Of Arsenite And Arsenate In Aqueous Samples"
Acta Hydrochim. Hydrobiol. 2000 Volume 28, Issue 1 Pages 41-46
M. Bissen, T. Gremm, Ü. Köklü, F. H. Frimmel

Abstract: The method described uses the separation of As(III) and As(V) species in aqueous samples by means of the anion-exchange resin Amberlite IRA-93. The samples were acidified using acetic acid and passed through a glass column filled with pre-treated Amberlite IRA-93 resin. As(III) was poorly adsorbed on the anionic exchanger material, whereas As(V) was retained. The arsenic concentration was measured in the column effluent by graphite furnace AAS (GF-AAS). The retained As(V) was eluted from the column using 1 M NaOH. Prior to the determination of the As(V) concentration in the NaOH eluate, the eluate was passed through a glass column filled with a cation-exchange resin (Amberlite 200) to remove sodium ions and minimize the Na+ interference with the AAS determination. After calibration the method was applied to the separation of As(III) and As(V) species in two aqueous extracts of arsenic contaminated soils. The results were compared with those obtained from an on-line separation and determination of As(III) and As(V) in the aqueous soil extracts using a state of the art HPLC-ICP-MS system.
Arsenate ion Arsenite Spectrophotometry Spectrophotometry Ion exchange Resin Amberlite Method comparison Speciation

"Determination Of Antimony Species With Fluoride As Modifier And Flow Injection Hydride Generation Inductively-coupled Plasma Emission Spectrometry"
Anal. Chim. Acta 2000 Volume 417, Issue 2 Pages 201-209
Nina Ulrich

Abstract: A new method for the determination of species of antimony(III) [Sb(III)], antimony(v) [Sb(V)] and trimethylstiboxide [TMeSbO] with fluoride as modifier is introduced. A flow injection (FI) system for hydride generation was used in combination with an inductively-coupled plasma atomic emission spectrometer as detector. The pre-reduction was accomplished with potassium iodide dissolved in hydrochloric acid and the reduction with sodium borohydride. The influence of fluoride on the reduction and pre-reduction step was investigated by adding different amounts of sodium fluoride to the solvent stream. At a concentration of 100 mg/l fluoride and 1.2% potassium iodide, the hydride formation of Sb(V) and Sb(III) was suppressed below the detection limit, while TMeSbO showed no signal depression. The use of 100 mg/l fluoride without potassium iodide led to complete signal suppression for Sb(V) with apparently no influence on the signal intensity of Sb(III) and TMeSbO. The concentration of TMeSbO was measured directly, the concentrations of Sb(III) and Sb(V) were calculated on the basis of the three analyzing steps, giving detection limits and relative standard deviations of 1.1 (2.6%), 1.2 (5.3%) and 1.4 µg/l (8.1%), respectively. The method was applied to orange juice samples.
Antimony(3+) Antimony(5+) Trimethylstibine oxide Spectrophotometry Speciation Interferences Method comparison

"Rapid Determination Of Dissolved Organic Phosphorus In Soil Leachates And Runoff Waters By Flow Injection Analysis With Online Photooxidation"
Talanta 1997 Volume 45, Issue 1 Pages 47-55
D. M. W. Peata, I. D. McKelvieb, G. P. Matthewsa, P. M. Haygarthc and P. J. Worsfolda,*

Abstract: A rapid method suitable for the determination of dissolved organic phosphorus (DOP) in soil leachates and runoff waters is presented. The flow injection (FI) manifold contains an inline PTFE reaction coil wrapped around a low power UV lamp and is based on the spectrophotometric determination of dissolved reactive phosphorus (DRP) and mineralised DOP at 690 nm after reduction of phosphomolybdate to molybdenum blue with tin(II) chloride. The linear range was 0-1.5 mg L-1 PO4-P, with a detection limit (3s) of 7 µg L-1 and a sample throughput of 40 h-1 Tolerance to potential matrix interferences in soil pore waters, particularly Al(III), Si(IV), Fe(II) and Fe(III), was achieved using a combination of online sample pretreatment by a strong acid ion exchange column, low photoreactor pH and acid induced control of the kinetics of the molybdenum blue reaction. The results obtained with this manifold were in good agreement with those obtained by a batch spectrophotometric reference method.
Phosphorus Ion exchange Spectrophotometry Photochemistry Interferences Kinetic Method comparison UV reactor