Flow on-line sorption preconcentration in a knotted reactor coupled with electrothermal atomic absorption spectrometry for selective As(iii) determination in sea-water samples

23 May 2005

journal article
research article
Published by Royal Society of Chemistry (RSC) in Journal of Analytical Atomic Spectrometry

Vol. 20 (7) , 662-664
https://doi.org/10.1039/b416772d

Abstract

A flow injection on-line sorption preconcentration system using a polytetrafluoroethylene (PTFE) knotted reactor was coupled with electrothermal atomic absorption spectrometry (ETAAS) to determine selectively As(III) in sea-water samples. Separation of arsenic inorganic species was achieved by the on-line formation of As(III)–pyrrolidine dithiocarbamate (PDC) complex in an acid medium, its sorption onto the inner walls of the knotted reactor (KR) and elution with 40 μl of ethanol. An enhancement factor (EF) of 44 was obtained compared with the slope of the linear portion of the calibration curve before and after preconcentration The detection limit (3 s) was 0.008 μg l⁻¹ As(III). The precision (RSD n = 11) was 4.5% at 0.1 μg l⁻¹ As(III). The accuracy was demonstrated by total arsenic determination in certificed reference material, NASS-4, after pre-reduction of As(V) with L-cysteine 0.25% (m/v).

Keywords

This publication has 13 references indexed in Scilit:

Simultaneous on-line preconcentration and determination of Pt, Rh and Pd in urine, serum and road dust by flow injection combined with inductively coupled plasma time-of-flight mass spectrometry
Journal of Analytical Atomic Spectrometry, 2003
Flow Injection On-Line Sorption Preconcentration Coupled with Hydride Generation Atomic Fluorescence Spectrometry for Determination of (Ultra)trace Amounts of Arsenic(III) and Arsenic(V) in Natural Water Samples
Analytical Chemistry, 2002
A Flow Injection On-Line Multiplexed Sorption Preconcentration Procedure Coupled with Flame Atomic Absorption Spectrometry for Determination of Trace Lead in Water, Tea, and Herb Medicines
Analytical Chemistry, 2002
Flow injection on-line preconcentration and separation coupled with atomic (mass) spectrometry for trace element (speciation) analysis based on sorption of organo-metallic complexes in a knotted reactor
TrAC Trends in Analytical Chemistry, 2001
Flow injection on-line sorption preconcentration of trace amounts of copper and manganese in a knotted reactor precoated with 1-phenyl-3-methyl-4-benzoylpyrazol-5-one coupled with electrothermal atomic absorption spectrometry
Journal of Analytical Atomic Spectrometry, 1999
Trends and potentials in flow injection on-line separation and preconcentration techniques for electrothermal atomic absorption spectrometry
Spectrochimica Acta Part B: Atomic Spectroscopy, 1998
Investigation of on-line coupling electrothermal atomic absorption spectrometry with flow injection sorption preconcentration using a knotted reactor for totally automatic determination of lead in water samples
Spectrochimica Acta Part B: Atomic Spectroscopy, 1996
Determination of (ultra)trace amounts of antimony(III) in water by flow injection on-line sorption preconcentration in a knotted reactor coupled with electrothermal atomic absorption spectrometry
The Analyst, 1996
Determination of cadmium in biological materials by flame atomic absorption spectrometry with flow-injection on-line sorption preconcentration
Talanta, 1994
Determination of arsenic(III), arsenic(V), antimony(III), antimony(V), selenium(IV) and selenium(VI) by extraction with ammonium pyrrolidinedithiocarbamate—methyl isobutyl ketone and electrothermal atomic absorption spectrometry
Analytica Chimica Acta, 1981