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Supercritical fluid extraction (SFE) in environmental analysis

total extraction and study of pesticide retention in soil

Berglöf, Tomas (1997). Supercritical fluid extraction (SFE) in environmental analysis. Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis agriculturae Sueciae. Agraria, 1401-6249 ; 70
ISBN 91-576-5500-6
[Doctoral thesis]

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Abstract

This thesis deals with the use of supercritical fluid extraction (SFE) in environmental analysis. Traditionally SFE in environmental analysis has been used for quantitative extraction. In this thesis, quantitative extraction as well as other applications of SFE will be discussed.

Studies of SFE extraction efficiency of pesticides from water and soil matrices were performed. Solid phase extraction (SPE) with Empore discs and bulk sorbent in combination with SFE, showed promising results for extraction of pesticides from water samples. With the bulk sorbent, it may also be possible to design effective extraction procedures for specific target analytes, using sorbents with different chemical properties. Sulfonylurea herbicides were extracted from soil with the objective to develop a general SFE procedure for sulfonylureas. The results showed that optimized SFE methods cannot always be directly applied to similar compounds without further method development.

The possibility to fine tune the selectivity of SFE were used for pesticide retention
studies on model matrices and soils. Investigation on model matrices with well known properties (sand and silica) gave valuable information for further studies on binding mechanisms. The purpose of such studies would be to characterize different interactions that determine the behaviour of pesticides in complex matrices such as soils. Extraction of soils under moderate SFE condition, i.e. nonquantitative extraction, allows the interaction between soil and analyte to influence the recovery. This is useful for pesticide retention studies. The results indicate that nonquantitative extraction can be used to study the relative strength of different types of sorptive sites. The use of SFE to determine pesticide sorption coefficients (~) in field-moist soil has the potential to yield better information to model the fate of pesticides in the field than sorption coefficients characterized by traditional batch-slurry techniques.

Authors/Creators:Berglöf, Tomas
Title:Supercritical fluid extraction (SFE) in environmental analysis
Subtitle:total extraction and study of pesticide retention in soil
Series/Journal:Acta Universitatis agriculturae Sueciae. Agraria (1401-6249)
Year of publishing :1997
Depositing date:9 January 2017
Volume:70
Number of Pages:33
Papers/manuscripts:
NumberReferences
I.Solid-phase extraction of pesticides from surface water using discs, bulk sorbents and supercritical fluid extraction (SFE). Bengtsson, S., Berglöf, T., Granat, S. and Jonsäll, G. Pestic. Sci. 41 55-60 (1994).
II.Supercritical fluid extraction of metsulfuron methyl, sulfometuron methyl, and nicosulfuron from soils. Berglöf, T., Koskinen, W. C. and Kylin, Intern. J. Environ. Anal. Chem., in press.
III.Selectivity in supercritical fluid extraction (SFE). Recovery of pesticides from model matrices. Berglöf, T., Jonsäll, G. and Markides, K. E. Manuscript submitted to J. Chromatography
IV.Predicting the leachability of pesticides from soils using Near Infrared Reflectance. Bengtsson, S., Berglöf, T. and Sjöqvist, T. J. Agric. Food Chem. 44 2260-2265 (1996).
V.Metsulfuron methyl sorption-desorption in field moist soils. Berglöf, T., Koskinen, W. C., Norberg, K. and Kylin, H. J. Agric. Food Chem., submitted.
Place of Publication:Uppsala
Publisher:Department of Environmental Assessment, Swedish University of Agricultural Sciences
ISBN for printed version:91-576-5500-6
ISSN:1401-6249
Language:English
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:T Pollution > T01 Pollution
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 104 Chemical Sciences > Analytical Chemistry
(A) Swedish standard research categories 2011 > 1 Natural sciences > 105 Earth and Related Environmental Sciences > Environmental Sciences (social aspects to be 507)
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Soil Science
Agrovoc terms:pesticides, soil pollution, environmental impact assessment, supercritical fluid extraction, analytical methods
Keywords:environmental analytical chemistry, pesticides, SFE, soil retention, supercritical fluid extraction
URN:NBN:urn:nbn:se:slu:epsilon-e-3873
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-3873
ID Code:13950
Faculty:L - Lantbruksvetenskaplig fakultet (t.o.m. 2003)
Department:(NL, NJ) > Dept. of Environmental Assessment
Deposited By: Lars Sonesten
Deposited On:10 Jan 2017 14:28
Metadata Last Modified:10 Jan 2017 14:28

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