Determination of organophosphorus pesticides in soil by headspace solid-phase microextraction

Ng, Wei Fang; Teo, Mui Jun Karen; Lakso, Hans-Åke

doi:10.1007/s002160051270

Cited by 61 publications

(12 citation statements)

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“…Therefore, we considered HS-SPME as an alternative to DI-SPME. HS-SPME has been applied to the determination of semi-volatile organophosphorus pesticides in soil by Ng et al [32]. Considering the physico-chemical characteristics of analytes, as regards volatility, the headspace mode seems to be an attractive alternative to direct immersion.…”

Section: Spme Optimisationmentioning

confidence: 99%

Application of solid phase microextraction for the determination of soil fumigants in water and soil samples

Fuster

Beltrán²,

López

et al. 2005

J. Sep. Science

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The potential of solid phase microextraction (SPME) for the determination of the soil fumigants 1,3-dichloropropene (1,3-DCP) and methyl isothiocyanate (MITC) in environmental samples such as soil and water samples has been investigated. Direct immersion SPME followed by GC/ECD/NPD analysis allowed the rapid determination of the two fumigants in water samples, with very little sample manipulation, giving an LOD of 0.5 microg L(-1). Precision, calculated as relative standard deviation (RSD) for six replicates at three concentration levels, was found to be lower than 20% at the concentration levels tested. For the analysis of soil samples, headspace (HS)-SPME combined with GC/ECD/NPD analysis has been applied. Quantification using matrix-matched calibration curves allowed determination of both analytes (MITC and 1-3-DCP) with a LOD of 0.1 microg kg(-1) (RSD < 10%) for the two concentration levels assayed (0.02 and 0.2 mg kg(-1)). The HS-SPME procedure developed in this paper was applied to soil samples from experimental green house plots treated with metham-Na, a soil disinfestation agent that decomposes in soil to MITC. The absence of sample manipulation as well as the low solvent consumption in SPME methodology are among the main advantages of this analytical approach.

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Section: Spme Optimisationmentioning

confidence: 99%

Application of solid phase microextraction for the determination of soil fumigants in water and soil samples

Fuster

Beltrán²,

López

et al. 2005

J. Sep. Science

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“…It is the most common organophosphate insecticide applied in the United States [12]. Various methodologies such as LLE-GC, SPE-GC, cloud-point extraction-LC-UV and SPME-GC have been employed to analyze malathion [13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

A Polypyrrole-Based Sorptive Microextraction Coating for Preconcentration of Malathion from Aquatic Media

et al. 2011

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A new micro-solid phase extraction method was developed by combining solid-phase extraction and stir bar sorptive extraction to benefit from the advantages of both techniques. A polypyrrole coating was electrochemically synthesized on the surface of an already used graphite furnace, employed in electro-thermal atomic absorption spectroscopy. The cylindrical geometry of the graphite tube provided a rather huge surface area, suitable for sorptive extraction. The novel sorbent coating was examined as an extracting medium to isolate malathion. Effects of different parameters such as extraction time, salt concentration, sample volume, desorption solvent and time were investigated and optimized. Under the optimized conditions, the limit of detection and limit of quantification of the developed method were 5 and 20 ng L -1 , respectively. The calibration curve showed linearity in the range of 0.1-100 lg L -1 (R 2 = 0.9968). The precision was evaluated at 0.1 and 1 lg L -1 concentration levels and relative standard deviations (n = 3) were found to be 10 and 7%, respectively. The developed method was successfully applied to the extraction of malathion from real river water and tap water samples, and relative recoveries at the spiked level of 0.1 lg L -1 were 94 and 97%, respectively.

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“…SPME is now considered to be a fairly mature sample-preparation technique with wide applications for the determination of polar and non-polar pollutants in water samples ranging from environmental, biomedical to agricultural; the technique has been used to a host of scientific and industrial important samples by various researchers including the analysis of pesticides [4], PAHs [5], substituted benzene compounds [6] and trihalomethanes [7] in aqueous samples. It is a solventfree process that combines sampling, extraction, concentration and instrument introduction into a single step; it successfully overcomes the inherent shortcomings of conventional and complicated sample-preparation methods described previously [8][9][10]. However, it has a few drawbacks, such as limited lifetime and linear range, fragility of the fibers, lower extraction efficiency, sample carryover, relatively expensive fibers and fiber assembly holder [11].…”

Section: Introductionmentioning

confidence: 99%

Determination of polycyclic aromatic hydrocarbons in water by a novel mesoporous‐coated stainless steel wire microextraction combined with HPLC

Wang

Rao

et al. 2010

J of Separation Science

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A novel mesoporous-coated stainless steel wire microextraction coupled with the HPLC procedure for quantification of four polycyclic aromatic hydrocarbons in water has been developed, based on the sorption of target analytes on a selectively adsorptive fiber and subsequent desorption of analytes directly into HPLC. Phenyl-functionalized mesoporous materials (Ph-SBA-15) were synthesized and coated on the surfaces of a stainless steel wire. Due to the high porosity and large surface area of the Ph-SBA-15, high extraction efficiency is expected. The influence of various parameters on polycyclic aromatic hydrocarbons extraction efficiency were thoroughly studied and optimized (such as the extraction temperature, the extraction time, the desorption time, the stirring rate and the ionic strength of samples). The results showed that each compound for the analysis of real water samples was tested under optimal conditions with the linearity ranging from 1.02×10(-3) to 200 μg/ L and the detection limits were found from 0.32 to 2.44 ng/ L, respectively. The RSD of the new method was smaller than 4.10%.

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Determination of organophosphorus pesticides in soil by headspace solid-phase microextraction

Cited by 61 publications

References 0 publications

Application of solid phase microextraction for the determination of soil fumigants in water and soil samples

Application of solid phase microextraction for the determination of soil fumigants in water and soil samples

A Polypyrrole-Based Sorptive Microextraction Coating for Preconcentration of Malathion from Aquatic Media

Determination of polycyclic aromatic hydrocarbons in water by a novel mesoporous‐coated stainless steel wire microextraction combined with HPLC

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