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Hollow-fiber Microextraction Combined with Hydrophilic Interaction Liquid Chromatography Mass Spectrometry for Analytical Determination of High Polarity Herbicides in Water
Paper Type  |
Contributed Paper |
Title |
Hollow-fiber Microextraction Combined with Hydrophilic Interaction Liquid Chromatography Mass Spectrometry for Analytical Determination of High Polarity Herbicides in Water |
Author |
Siripastr Jayanta and Natchanun Leepipatpiboon |
Email |
siripastr.ja@chula.ac.th |
|
Abstract: A hollow-fiber microextraction (HF-LPME) method was developed for the extraction of four high polarity herbicides (paraquat, diquat, chlormequat, and mepiquat) prior to the analysis by high performance liquid chromatography-mass spectrometry (LC-MS). The miniature extraction system was constructed from a single piece of hollow fiber membrane. Di-(2-ethyl hexyl)phosphoric acid in di-n-hexyl ether was used as membrane supporting liquid. Samples were adjusted to pH 5.0 by a phosphate buffer, and the acceptor solution was HCl pH 0.5. The extracted herbicides were separated on a hydrophilic interaction liquid chromatographic column within 5 minutes using isocratic elution of 10 mM ammonium formate:acetonitrile (50:50). The factors affecting the extraction efficiency were investigated. Under the optimum conditions, the enrichment factors were in the range of 49-476. Excellent linear dynamic range was observed from 2-180 mg/L with correlation coefficients (R2) better than 0.997. Method detection limits were 0.04-0.13 mg/L which are better than values published in the U.S. EPA method 549.2-1. The procedure was validated and tested on water, and rice samples with good success. The method was accurate with recoveries ranging from 71.6 to 78.7%. Good intra-precision and intermediate precision were obtained with RSD lower than 11%. |
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Start & End Page |
2381 - 2396 |
Received Date |
2017-08-03 |
Revised Date |
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Accepted Date |
2017-12-12 |
Full Text |
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File Supplemental |
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Keyword |
hollow-fiber microextraction, carrier-mediated transport, high polarity herbicide, quaternary nitrogen herbicide, high performance liquid chromatography-mass spectrometry, hydrophilic interaction liquid chromatography |
Volume |
Vol.45 No.6 (September 2018) |
DOI |
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Citation |
Jayanta S. and Leepipatpiboon N., Hollow-fiber Microextraction Combined with Hydrophilic Interaction Liquid Chromatography Mass Spectrometry for Analytical Determination of High Polarity Herbicides in Water, Chiang Mai Journal of Science, 2018; 45(6): 2381-2396. |
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