Simultaneous extraction and derivatization of 2-chlorovinylarsonous acid from soils using supercritical and pressurized fluids.
Supercritical carbon dioxide and pressurized fluids are compared for the extraction with in situ derivatization of 2-chlorovinylarsonous acid (CVAA) from a series of seven spiked soils. Samples are allowed to age (up to 42 days) and periodically extracted. Sample ageing leads to a recovery decrease due to the development of strong interactions between CVAA and matrix active sites, as time elapses. A similar behavior is observed when usual ultrasonic extraction is performed. Supercritical fluid extraction (SFE) with in situ derivatization leads to the highest recovery. Moreover, SFE allows a solvent consumption reduction. A limit of detection of 0.2 microg/g is reached with the SFE method.
Chaudot
X
X
Direction des Centres d'Expertise et d'Essais, Centre d'Etudes du Bouchet, Vert-le Petit, France.
Tambuté
A
A
Caude
M
M
D001152:Arsenicals / Q000032:analysis / Q000302:isolation & purification*; D002849:Chromatography, Gas / Q000379:methods; D012989:Soil Pollutants / Q000032:analysis / Q000302:isolation & purification*; D012997:Solvents
D001152:Arsenicals; D012989:Soil Pollutants; D012997:Solvents; C035965:lewisite