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Organoarsenic Compounds (organoarsenic + compound)

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Chemistry100%

Selected Abstracts

Organoarsenic compounds in plants and soil on top of an ore vein

APPLIED ORGANOMETALLIC CHEMISTRY, Issue 5 2002
Anita Geiszinger
Abstract Plants and soil collected above an ore vein in Gasen (Austria) were investigated for total arsenic concentrations by inductively coupled plasma mass spectrometry (ICP-MS). Total arsenic concentrations in all samples were higher than those usually found at non-contaminated sites. The arsenic concentration in the soil ranged from ,700 to ,4000,mg kg,1 dry mass. Arsenic concentrations in plant samples ranged from ,0.5 to 6,mg kg,1 dry mass and varied with plant species and plant part. Examination of plant and soil extracts by high-performance liquid chromatography,ICP-MS revealed that only small amounts of arsenic (<1%) could be extracted from the soil and the main part of the extractable arsenic from soil was inorganic arsenic, dominated by arsenate. Trimethylarsine oxide and arsenobetaine were also detected as minor compounds in soil. The extracts of the plants (Trifolium pratense, Dactylis glomerata, and Plantago lanceolata) contained arsenate, arsenite, methylarsonic acid, dimethylarsinic acid, trimethylarsine oxide, the tetramethylarsonium ion, arsenobetaine, and arsenocholine (2.5,12% extraction efficiency). The arsenic compounds and their concentrations differed with plant species. The extracts of D. glomerata and P. lanceolata contained mainly inorganic arsenic compounds typical of most other plants. T. pratense, on the other hand, contained mainly organic arsenicals and the major compound was methylarsonic acid. Copyright © 2002 John Wiley & Sons, Ltd. [source]

Development of a liquid chromatography/electrospray selected reaction monitoring method for the determination of organoarsenic species in marine and freshwater samples

RAPID COMMUNICATIONS IN MASS SPECTROMETRY, Issue 19 2006
Richard Schaeffer
Cation- and anion-exchange high-performance liquid chromatography/electrospray selected reaction monitoring (HPLC/ES-SRM) methods were developed for the determination of 15 organoarsenic compounds in marine and freshwater samples. The results demonstrate that the developed HPLC/ES-SRM methods are powerful approaches for the identification of organoarsenic species in crude sample extracts. The detection limits, linearity as well as reproducibility for most of the species are comparable or even better than those measured by the HPLC/inductively coupled plasma mass spectrometry (ICPMS) technique. The qualitative analysis of the extracts shows that the developed methods allow for the identification of arsenicals which were not detectable by ICPMS. It was also demonstrated that the signal suppression caused by matrix effects means a significant limitation in the quantification of arsenicals by ES-SRM detection. This drawback is manifested especially in the case of the slightly retained species. The three sample-cleanup chromatographic methods including off-line size-exclusion, on-line reversed-phase and on-line oppositely charged ion-exchange approaches proved to be ineffective for separation of the signal-suppressive matrix from the analytes. The standard addition calibration seems to be a suitable solution for such problems. Copyright © 2006 John Wiley & Sons, Ltd. [source]

Analytical sensitivity of arsenobetaine on atomic spectrometric analysis and the purity of synthetic arsenobetaine,

APPLIED ORGANOMETALLIC CHEMISTRY, Issue 9 2006
T. Narukawa
Abstract Arsenobetaine is one of the main organoarsenic compounds that exist in living organisms. Determination errors in total arsenic analyses for organoarsenic compounds occur because analytical sensitivities depend upon the chemical forms of the compounds. However, information on the analytical sensitivity of arsenobetaine by ICP-MS and ICP-AES and the purity of commercially available arsenobetaine standards is lacking. BCR CRM 626 (arsenobetaine solution) is a certified reference material from IRMM with a certified concentration of arsenobetaine. The sensitivity and behavior of arsenobetaine on ICP-MS and ICP-AES were investigated using the BCR arsenobetaine. The analytical sensitivity and behavior of arsenobetaine using ICP-MS and ICP-AES were also investigated using a commercially available synthetic arsenobetaine, and were compared with results for BCR-AB based on a Japan calibration service system (JCSS) arsenic standard solution. In the results, arsenic determined directly in arsenobetaine showed about 15% greater sensitivity in analysis by ICP-MS and ICP-AES than did inorganic (JCSS) arsenic. Copyright © 2006 John Wiley & Sons, Ltd. [source]