Trace determination of organophosphorus pesticides in environmental samples by temperature-controlled ionic liquid dispersive liquid-phase microextraction

Zhou, Qingxiang; Bai, Huahua; Xie, Guohong; Xiao, Junping

doi:10.1016/j.chroma.2008.02.094

Cited by 248Analytical chemistry methods developmentPesticide Residue Analysis and SafetyIonic liquids properties and applications

Trace determination of organophosphorus pesticides in environmental samples by temperature-controlled ionic liquid dispersive liquid-phase microextraction

Zhou, Qingxiang, Bai, Huahua, Xie, Guohong, Xiao, Junping·2008·Journal of Chromatography A

DOI 10.1016/j.chroma.2008.02.094

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Abstract

This paper described a new approach for the determination of organophosphorus pesticides by temperature-controlled ionic liquid dispersive liquid-phase microextraction prior to high-performance liquid chromatography with ultraviolet detection. Methylparathion and phoxim, two of the typical organophosphorus pesticides, were used as the model analytes for the investigation of the development and application of the new microextraction method. 1-Hexyl-3-methylimidazolium hexafluorophosphate [C6MIM][PF6] was used as the extraction solvent and the factors affecting the extraction efficiency such as the volume of [C6MIM][PF6], pH of working solutions, extraction time, centrifuging time, dissoluble temperature and salt effect were optimized. Under the optimal extraction conditions, methylparathion and phoxim exhibited good linear relationship in the concentration range of 1-100 ng mL(-1). The detection limits were 0.17 ng mL(-1) and 0.29 ng mL(-1), respectively. Precisions of proposed method (RSDs, n=6) were 2.5% and 2.7%, respectively. This proposed method was successfully applied in the analysis of four real environmental water samples and good spiked recoveries over the range of 88.2-103.6% were obtained. These results indicated that temperature-controlled ionic liquid dispersive liquid-phase microextraction had excellent application prospect in environmental field.

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The temperature-controlled LPME variation has been applied using only ionic liquids as extractants.
“This variation of the technique has been applied using only ionic liquids (ILs) as extractants [13-16]”
From Dispersive liquid-liquid microextraction for determination of organic analytes (2010) · cites this paper as [14]
In four IL-DLLME pesticide works, no disperser solvent was used (only the IL [HMIm][PF6]), because dispersion is temperature-assisted.
“We should mention that, in four of these works [13-16], no disperser solvent was used (only the IL [HMIm][PF6]), since the dispersion is temperature-assisted.”
From Dispersive liquid-liquid microextraction for determination of organic analytes (2010) · cites this paper as [14]
In most IL-DLLME pesticide works, water samples were analyzed using HPLC as the separation technique.
“In most cases, water samples have also been analyzed using HPLC as the separation technique [13-16,32,47].”
From Dispersive liquid-liquid microextraction for determination of organic analytes (2010) · cites this paper as [14]
For IL-DLLME of pesticides, a relatively small number of works has been published, especially in recent years.
“Regarding IL-DLLME of pesticides, a relatively small number of works has come out, especially in recent years [13-16,32,38,47,50].”
From Dispersive liquid-liquid microextraction for determination of organic analytes (2010) · cites this paper as [14]
IL-DLLME has a drawback of a wide peak at the beginning of the chromatogram corresponding to the IL.
“As can be seen, at the beginning of the chromatogram, there appeared a wide peak, corresponding to the IL - one of the main drawbacks of using IL-DLLME, as already reported [14-19,32,38,47,50,65-67] -although, in this case, it did not interfere at all in the separation.”
From Dispersive liquid-liquid microextraction for determination of organic analytes (2010) · cites this paper as [14]

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Authors: Zhou, Q., Bai, H., Xie, G., & Xiao, J.
Affiliations: Henan Normal University (CN)
Henan Institute of Science and Technology (CN)
University of Science and Technology Beijing (CN)
Corresponding author: Zhou, Qingxiang
ORCID: Zhou, Qingxiang
Xiao, Junping
Venue: Journal of Chromatography A
Publisher: Elsevier BV
Published: 2008-04
Volume: 1188
Issue: 2
Pages: 148-153
ISSN: 0021-9673 (ISSN-L)
DOI: 10.1016/j.chroma.2008.02.094
OpenAlex: W2026987156
Cited by: 248
References: 36
Citations by year: 2026: 3 · 2025: 3 · 2024: 4 · 2023: 2 · 2022: 9 · 2021: 6 · 2020: 11 · 2019: 14 · 2018: 15 · 2017: 8 · 2016: 10 · 2015: 14 · 2014: 18 · 2013: 25 · 2012: 29
FWCI: 25.91
Type: journal article
Language: en
Open access: closed
Licence: www.elsevier.com/tdm/userlicense/1.0/ (tdm)
Locations: Journal of Chromatography A (publishedVersion)
PubMed (publishedVersion)
Topics: Physical Sciences › Chemistry › Analytical Chemistry › Analytical chemistry methods development
Life Sciences › Agricultural and Biological Sciences › Food Science › Pesticide Residue Analysis and Safety
Physical Sciences › Chemical Engineering › Catalysis › Ionic liquids properties and applications
Keywords: organophosphorus pesticides, ionic liquids, 1-hexyl-3-methylimidazolium hexafluorophosphate, methyl parathion, phoxim, environmental water samples, preconcentration
MeSH terms: Centrifugation, Chemistry Techniques, Analytical, Environmental Pollutants, Hydrogen-Ion Concentration, Organophosphorus Compounds, Pesticides, Salts, Temperature, Time Factors, Ionic Liquids

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Trace determination of organophosphorus pesticides in environmental samples by temperature-controlled ionic liquid dispersive liquid-phase microextraction

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