Yan R.,Jilin University |
Shao M.-Y.,Jilin University |
Liang Z.-F.,Academy of Quality Inspection and Research in Heilongjiang Province |
Zhang H.-Q.,Jilin University |
Yu A.-M.,Jilin University
Chemical Research in Chinese Universities | Year: 2013
Homogeneous ionic liquid microextraction was developed for the simultaneceus extraction of dimethomorph, mefenacet, isoprothiolane and oxadiazon from soil. 1-Butyl-3-methylimidazolium tetrafluoroborate was used as extraction solvent, and ammonium hexafluorophosphate was used as ion-pairing agent. High-performance liquid chromatography(HPLC) was employed for separation and determination of the analytes. The calibration curves show good linear relationship(r>0.9988). The recoveries are between 74.2% and 97.9% with relative standard deviations(RSDs) lower than 5.97%. The present method is free of volatile organic solvents, and expenditures of sample, extraction time and solvent are lower, compared with ultrasonic and Soxhlet extraction. There was no obvious difference in the extraction recoveries of pesticides obtained by the three extraction methods. © 2013 Jilin University, The Editorial Department of Chemical Research in Chinese Universities and Springer-Verlag GmbH.
Yan R.,Jilin University |
Yan R.,Academy of Quality Inspection and Research in Heilongjiang Province |
Ju F.,Academy of Quality Inspection and Research in Heilongjiang Province |
Wang H.,CAS Changchun Institute of Applied Chemistry |
And 4 more authors.
Analytical Methods | Year: 2014
A high-performance liquid chromatography method for determination of sulfonylurea herbicides in soil has been developed. Prior to the determination, sample preparation was performed by ionic liquid-based ultrasonic-assisted extraction (IL-based UAE). Dried soil powder was mixed with a room temperature ionic liquid, [C6MIM][BF4], to form a suspension, and then ultrasonic extraction was performed in a water bath at ambient temperature. The chromatographic separation was performed using a C18 chromatographic column with gradient elution mode. The method was validated by evaluating the repeatability, linearity, precision, and applicability. The limits of detection ranged from 7.7 ng g-1 to 11.3 ng g-1 and the limits of quantification were between 25.6 ng g-1 and 37.6 ng g-1. The calibration curves showed a good linear relationship (r > 0.9990) in the concentration ranges of 50.0-25 000 ng g-1 for nicosulfuron and 50.0-5000 ng g-1 for metsulfuron-methyl, bensulfuron-methyl and pyrazosulfuron-ethyl. The recoveries ranged from 81.1 to 100.1% with relative standard deviations lower than 7.44%. The IL-based UAE is free of volatile organic solvent, and consumes less sample, time and solvent, compared with regular ultrasonic and Soxhlet extractions. There was no obvious difference in the extraction recoveries of sulfonylurea herbicides obtained by the three methods. © The Royal Society of Chemistry 2014.