Supercritical fluid extraction of atrazine and its metabolites from soil
作者:
Roberto Alzaga,
Josep M. Bayona,
Damià Barceló,
期刊:
Journal of High Resolution Chromatography
(WILEY Available online 1996)
卷期:
Volume 19,
issue 1
页码: 23-26
ISSN:0935-6304
年代: 1996
DOI:10.1002/jhrc.1240190104
出版商: Wiley Subscription Services, Inc., A Wiley Company
关键词: Supercritical fluid extraction;cGC‐NPD herbicides;CO2modifiers;Incurred herbicides and metabolite extraction
数据来源: WILEY
摘要:
AbstractSoxhlet (methanol) and SFE extraction with carbon dioxide in the presence of modifiers at different temperatures (100–200°C) for the extraction of atrazine and its main metabolites from a soil sample were compared. The most effective extraction conditions for both atrazine and its metabolites (i.e.deethylatrazine and deisopropylatrazine) were Co2modified with 20% molar methanol‐trifluoroacetic acid (MeOH‐TFA) (TFA 0.65M in MeOH) at 100°C, leading to an extraction efficiency comparable with that of Soxhlet extraction with MeOH for atrazine andca.20% higher for its main metabolites. The relative standard deviation (RSD) of SFE was lower than that obtained by Soxhlet extraction, probably because of less interference in the cGC‐NPD determination. All the other modifiers evaluated (acetone, triethylamine, and methanol) were less effective than MeOH‐TFA for the extraction of atrazine and its metabolites from a soil sample, even at high molar concentrations (20%) and use of higher extraction temperatures (200°C). These results indicate the importance of matrix effects and the need of the selection of an appropriate modifier in order to obtain quantitative extrac
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