Capabilities of several phosphonium ionic liquids for arsenic species determination in water by liquid–liquid microextraction and electrothermal atomic absorption spectrometry

2015 ◽  
Vol 7 (2) ◽  
pp. 490-499 ◽  
Author(s):  
Alexander Castro Grijalba ◽  
Leticia B. Escudero ◽  
Rodolfo G. Wuilloud
Keyword(s):  
Ionic Liquids ◽  
Atomic Absorption Spectrometry ◽  
Atomic Absorption ◽  
Electrothermal Atomic Absorption Spectrometry ◽  
Absorption Spectrometry ◽  
Arsenic Species ◽  
Species Determination ◽  
As Species ◽  
Liquid Microextraction ◽  
Phosphonium Ionic Liquids

Different phosphonium ionic liquids have been assayed for liquid–liquid microextraction of As species.

Stability of Arsenobetaine Levels in Manufactured Baby Foods

2003 ◽  
Vol 66 (12) ◽  
pp. 2321-2324 ◽  
Author(s):  
P. VIÑAS ◽  
I. LÓPEZ-GARCÍA ◽  
B. MERINO-MEROÑO ◽  
N. CAMPILLO ◽  
M. HERNÁNDEZ-CÓRDOBA
Keyword(s):  
Atomic Absorption Spectrometry ◽  
Atomic Absorption ◽  
Electrothermal Atomic Absorption Spectrometry ◽  
Hydride Generation ◽  
Absorption Spectrometry ◽  
Arsenic Species ◽  
Experimental Conditions ◽  
Baby Foods ◽  
Freeze Dried ◽  
The Stability

The stability of arsenobetaine in baby foods under different experimental conditions is evaluated. Total arsenic was analyzed by electrothermal atomic absorption spectrometry, and the speciation of arsenicals was carried out by coupling liquid chromatography to hydride generation–atomic absorption spectrometry. The highest arsenic levels in the analyzed baby foods corresponded to those containing plaice (2 to 3 μg/g). The speciation data indicated that arsenobetaine, a nontoxic species, was the only arsenical present in the baby foods analyzed at levels between 0.2 and 3 μg/g. Two different procedures for extracting arsenicals from baby foods, involving a water-methanol-chloroform mixture and enzymatic hydrolysis, were tested, and similar results were obtained. Furthermore, the arsenobetaine levels remained unchanged when the baby foods were stored for different times or when the samples were freeze-dried, thus confirming the stability of arsenobetaine and the nonappearance of other arsenic species by interconversion. The reliability of the procedure was checked by analyzing a certified reference material.

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