Document Detail

Arsenic speciation in natural and contaminated waters using CZE with in situ derivatization by molybdate and direct UV-detection.
MedLine Citation:
PMID:  19330767     Owner:  NLM     Status:  MEDLINE    
A simple and sensitive procedure for simultaneous determination of arsenate, arsenite, monomethylarsonate and dimethylarsinate (DMA) ions in waters using CZE with chemical derivatization in situ and UV-detection at 250 nm was developed. The separation was performed in a fused-silica capillary using solution containing sodium molybdate and sodium perchlorate as electrolyte. Molybdate forms heteropolycomplexes with arsenic species in low acidic media, while sodium perchlorate masks silicate ion. The analysis conditions were optimized; the best results were achieved with the electrolyte consisting of 10 mM Na(2)MoO(4) and 10 mM NaClO(4) at pH 3.0 using negative voltage and pneumatic injection of the sample. Nevertheless, the signal of arsenite ion was not detected, probably because of its instability. Arsenite ion was quantified as a difference between arsenate ion contents after and before oxidation by bromine water. The detection limits for the fresh water at the level of 5.0 microg/L for As(III) and As(V), 16 microg/L for DMA and 20 microg/L for MMA were achieved. The reproducibility varied in the range of 0.06-0.25 relative units. To reduce the interferences of the sample salinity an addition of organic substances and isotachophoretic effect were used.
Olga S Koshcheeva; Olga V Shuvaeva; Lidiya I Kuznetzova
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Electrophoresis     Volume:  30     ISSN:  1522-2683     ISO Abbreviation:  Electrophoresis     Publication Date:  2009 Mar 
Date Detail:
Created Date:  2009-04-01     Completed Date:  2009-08-18     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8204476     Medline TA:  Electrophoresis     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  1088-93     Citation Subset:  IM    
A.V. Nikolaev Institute of Inorganic Chemistry, Siberian Branch of Russian Academy of Sciences, Novosibirsk, Russia.
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MeSH Terms
Arsenicals / analysis*
Electrophoresis, Capillary / methods*
Fresh Water / chemistry*
Molybdenum / chemistry
Perchloric Acid / chemistry
Reproducibility of Results
Sensitivity and Specificity
Sodium Compounds / chemistry
Water Pollutants, Chemical / analysis*
Reg. No./Substance:
0/Arsenicals; 0/Sodium Compounds; 0/Water Pollutants, Chemical; 7439-98-7/Molybdenum; 7601-89-0/sodium perchlorate; 7601-90-3/Perchloric Acid; 7631-95-0/sodium molybdate(VI)

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