On-line arsenic co-precipitation on ethyl vinyl acetate turning-packed mini-column followed by hydride generation-ICP OES determination.

An alternative and new system for on-line preconcentration of arsenic by sorption on a mini-column associated to hydride generation--inductively coupled plasma--optical emission spectrometry determination was studied. It is based on the sorption of arsenic on a column packed with ethyl vinyl acetate (EVA) turnings and the use of La(III) as co-precipitant reagent. This polymeric material was employed here for the first time as filling material for column preconcentration. It could work both as adsorbent and as sieve material. Sample and co-precipitant agent (lanthanum nitrate) were off-line mixed and merged with ammonium buffer solution (pH 10.0), which promoted precipitation and quantitative collection on the small EVA turnings. The arsenic preconcentrated by co-precipitation with lanthanum hydroxide precipitate was subsequently eluted with hydrochloric acid, which was the medium used for hydride generation. Considering a flow rate of 5 ml/min, three enrichment factors were obtained, 28-, 38- and 45-fold at three different sampling times, 60, 120 and 180s; respectively. The detection limits (3s) obtained for each case were 0.013, 0.009 and 0.007 microg/l. Additionally, the calculated precisions expressed as relatively standard deviation (R.S.D.) were 0.9, 1.3 and 1.1%. Satisfactory results were obtained for the determination of arsenic in standard reference material NIST 1643e Trace Elements in Water and drinking water samples.

[1]  V. Dressler,et al.  Determination of arsenic(III) and arsenic(V) by electrothermal atomic absorption spectrometry after complexation and sorption on a C-18 bonded silica column. , 1998, Talanta.

[2]  E. Hansen,et al.  Determination of ultra-trace amounts of selenium(IV) by flow injection hydride generation atomic absorption spectrometry with on-line preconcentration by coprecipitation with lanthanum hydroxide , 1994 .

[3]  J. Sloth,et al.  Determination of ultra-trace amounts of arsenic(III) by flow-injection hydride generation atomic absorption spectrometry with on-line preconcentration by coprecipitation with lanthanum hydroxide or hafnium hydroxide. , 1996, Talanta.

[4]  C. Barbante,et al.  Inter-method comparison for the determination of antimony and arsenic in peat samples , 2002 .

[5]  E. Hansen,et al.  Determination of As(III) and As(V) by flow injection-hydride generation-atomic absorption spectrometry via on-line reduction of As(V) by KI , 1997 .

[6]  V. Cerdà,et al.  Preconcentration and determination of inorganic arsenic using a multisyringe flow injection system and hydride generation-atomic fluorescence spectrometry. , 2004, Talanta.

[7]  N. Coelho,et al.  High performance liquid chromatography—atomic fluorescence spectrometric determination of arsenic species in beer samples , 2003 .

[8]  Shoji Motomizu,et al.  Speciation of arsenic(III) and arsenic(V) by inductively coupled plasma-atomic emission spectrometry coupled with preconcentration system. , 2005, Talanta.

[9]  G. Jiang,et al.  Determination of As(III) and As(V) in soils using sequential extraction combined with flow injection hydride generation atomic fluorescence detection , 2003 .

[10]  F. Barbosa,et al.  Determination of arsenic in sediment and soil slurries by electrothermal atomic absorption spectrometry using W–Rh permanent modifier , 2000 .

[11]  C. Wai,et al.  Determination of arsenic and antimony in biological materials by solvent extraction and neutron activation. , 1988, Talanta.

[12]  L. Vuchkova,et al.  Behaviour of the dithiocarbamate complexes of arsenic, antimony, bismuth, mercury, lead, tin and selenium in methanol with a hydride generator. , 1996, Talanta.

[13]  D. Tsalev,et al.  Fast automated determination of toxicologically relevant arsenic in urine by flow injection-hydride generation atomic absorption spectrometry , 1997 .

[14]  P. Perämäki,et al.  Optimization of a flow injection hydride generation atomic absorption spectrometric method for the determination of arsenic, antimony and selenium in iron chloride/sulfate-based water treatment chemical , 2001 .

[15]  P. Smedley,et al.  A review of the source, behaviour and distribution of arsenic in natural waters , 2002 .

[16]  Y. Pak,et al.  Separation and sensitive determination of arsenic species (As3+/As5+) using the yeast-immobilized column and hydride generation in ICP–AES , 2005 .

[17]  S. Kounaves,et al.  Voltammetric measurement of arsenic in natural waters. , 2002, Talanta.

[18]  Z. Fang.  Flow Injection Separation and Preconcentration , 1993 .

[19]  A. Khan,et al.  Electrochemical measurement and speciation of inorganic arsenic in groundwater of Bangladesh. , 2002, Talanta.

[20]  A. Cardoso,et al.  Spectrophotometric detection of arsenic using flow-injection hydride generation following sorbent extraction preconcentration. , 1999, Talanta.

[21]  Isoshi Nukatsuka,et al.  Determination of Arsenic(III) and Total Arsenic(III,V) in Water Samples by Resin Suspension Graphite Furnace Atomic Absorption Spectrometry , 1999 .

[22]  S. Hirata,et al.  Simultaneous determination of arsenic(III) and arsenic(V) by flow injection–inductively coupled plasma–atomic emission spectrometry (ICP-AES) with ultrasonic nebulization , 2003, Analytical and bioanalytical chemistry.

[23]  M. Barciela-Alonso,et al.  Flow on-line sorption preconcentration in a knotted reactor coupled with electrothermal atomic absorption spectrometry for selective As(III) determination in sea-water samples , 2005 .

[24]  X. Yan,et al.  Determination of (ultra)trace amounts of arsenic(III) and arsenic(V) in water by inductively coupled plasma mass spectrometry coupled with flow injection on-line sorption preconcentration and separation in a knotted reactor. , 1998, Analytical chemistry.

[25]  J. Sloth,et al.  Determination of ultra-trace amounts of selenium(IV) by flow injection hydride generation atomic absorption spectrometry with on-line preconcentration by co-precipitation with lanthanum hydroxide. Part II. On-line addition of co-precipitating agent , 1996 .

[26]  F. Roberto,et al.  Evaluation of a GFP reporter gene construct for environmental arsenic detection. , 2002, Talanta.