TY  - JOUR
AU  - Lagarde, F.
AU  - Pütz, T.
AU  - Dressel, J.
AU  - Führ, F.
TI  - Simultaneous Determination of Ethidimuron, Methabenzthiazuron, and Their Two Major Degradation Products in Soil
JO  - Journal of agricultural and food chemistry
VL  - 54
SN  - 0021-8561
CY  - Washington, DC [u.a.]
PB  - American Chemical Society (ACS)
M1  - PreJuSER-52843
SP  - 7450 - 7459
PY  - 2006
N1  - Record converted from VDB: 12.11.2012
AB  - An analytical method has been developed for the quantification of two herbicides (ethidimuron and methabenzthiazuron) and their two main soil derivatives. This method involves fluidized-bed extraction (FBE) prior to cleanup and analysis by reverse-phase liquid chromatography with UV detection at 282 nm. FBE conditions were established to provide efficient extraction without degradation of the four analytes. (14)C-labeled compounds were used for the optimization of extraction and purification steps and for the determination of related efficiencies. Extraction was optimal using a fexIKA extractor operating at 110 degrees C for three cycles (total time = 95 min) with 75 g of soil and 150 mL of a 60:40 v/v acetone/water mixture. Extracts were further purified on a 500 mg silica SPE cartridge. Separation was performed on a C18 Purosphere column (250 mm x 4 mm i.d.), at 0.8 mL min(-1) and 30 degrees C with an elution gradient made up of phosphoric acid aqueous solution (pH 2.2) and acetonitrile. Calibration curves were found to be linear in the 0.5-50 mg L(-1) concentration range. Besides freshly spiked soil samples, method validation included the analysis of samples with aged residues. Recovery values, determined from spiked samples, were close to 100%. Limits of detection ranged between 2 and 3 microg kg(-1) of dry soil and limits of quantification between 8 and 10 microg kg(-1) of dry soil. An attempt to improve these performances by using fluorescence detection following postcolumn derivatization by orthophthalaldehyde-mercaptoethanol reagent was unsuccessful.
KW  - Benzothiazoles: analysis
KW  - Benzothiazoles: chemistry
KW  - Chromatography, High Pressure Liquid: methods
KW  - Herbicides: analysis
KW  - Methylurea Compounds: analysis
KW  - Methylurea Compounds: chemistry
KW  - Photolysis
KW  - Sensitivity and Specificity
KW  - Soil: analysis
KW  - Solutions
KW  - Benzothiazoles (NLM Chemicals)
KW  - Herbicides (NLM Chemicals)
KW  - Methylurea Compounds (NLM Chemicals)
KW  - Soil (NLM Chemicals)
KW  - Solutions (NLM Chemicals)
KW  - ethidimuron (NLM Chemicals)
KW  - methabenzthiazuron (NLM Chemicals)
KW  - J (WoSType)
LB  - PUB:(DE-HGF)16
C6  - pmid:17002407
UR  - <Go to ISI:>//WOS:000240795400007
DO  - DOI:10.1021/jf061042v
UR  - https://juser.fz-juelich.de/record/52843
ER  -