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: Environmental -> water -> interstitial

Citations 2

"Sulfur And Nutrient Analysis Of Sediments And Sediment Interstitial Water"
Int. J. Environ. Anal. Chem. 1988 Volume 34, Issue 2 Pages 109-117
Ripl, W.;Michel, J.

Abstract: An analytical system is described for determination of S, PO43- and NO3- in sediments and water. The system includes sampling, sample pre-treatment and digestion and flow injection analysis by standard and previously described methods. For the determination of SO42-, the calibration graph was rectilinear from 10 to 40 mg L-1 with coefficient of variation of 2.5%. Results are presented for PO43- and NO3- determined in interstitial water.
Sulfate Sulfur Phosphate Nitrate Sample preparation

"Arsenic Speciation In Aqueous Samples Using A Selective As(III)/As(V) Preconcentration In Combination With An Automatable Cryotrapping Hydride Generation Procedure For Monomethylarsonic Acid And Dimethylarsinic Acid"
J. Radioanal. Nucl. Chem. 1994 Volume 179, Issue 2 Pages 211-219
J. T. Van Elteren, H. A. Das, C. L. De Ligny, J. Agterdenbos and D. Bax

Abstract: Differentiation between As(III) and As(V) is accomplished using earlier developed selective pre-concentration methods (carbamate and molybdate mediated (co)precipitation of As(III) and As(V) respectively) follewed by AAS detection of the (co)precipitates. Apart from this, separation of methylated arsenic species is performed by an automatable system comprising a continuous flow hydride generation unit in which monomethylarsonic acid (MMAA) and dimethylarsinic acid (DMAA) are converted into their corresponding volatile methylarsines, monomethylarsine (MMA) and dimethylarsine (DMA) respectively. These species are cryogenically trapped in a Teflon-line stainless stell U-tube packed with a gas chromatographic solid-phase and subsequently separated by selective volatilization. A novel gas drying technique by means of a 'Perma Pure' dryer was applied successfully prior to trapping. Detection is by atomic absorption spectrometry (AAS). MMAA and DMAA are determined with absolute limits of detection of 0.2 and 0.5 ng, respectively. Investigation of the behavior of the methylarsines in the system was conducted with synthesized 73As labeled methylated arsenic species. It was found that MMA is taken through the system quantitatively whereas DMA is recovered for about 85%. The optimized system combined with selective As(III)/As(V) pre-concentration has been tested out for arsenic speciation of sediment interstitial water from the 'Chemiehaven' at Rotterdam. The obtained concentrations are 28.5, 26.8 and 0.60 ng mL-1 for As(III), As(V) and MMAA, respectively, whereas the DMAA concentration was below 0.16 ng mL-1.
monomethylarsonic acid Dimethylarsinic acid Spectrophotometry Speciation Preconcentration Volatile generation