Quantitative evaluation of perchlorethylene in groundwater before and after its oxidation by helical solid sorbent extraction and gas chromatography

Draga, Marius; Ciucanu, Ionel; Agotici, Vlad; Fernandez, Adelaide C.; Barna, Radu

doi:10.1016/j.chemosphere.2009.02.016

Cited by 2 publications

(2 citation statements)

References 11 publications

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“…The explanation could be the dissolution of the organic solvent in water. This is a very slow process and the solubility limit is reached in a few days []. Consequently, when the agitation was started, the droplets of organic solvent remain in suspension, even when the solvent is under the solubility limit and a LLME occurred, improving the extraction efficiency.…”

Section: Resultsmentioning

confidence: 99%

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Solid phase microextraction assisted by droplets‐based liquid–liquid microextraction for analysis of volatile aromatic hydrocarbons in water by gas chromatography

Ciucanu

Agotici

2012

J of Separation Science

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A new technique for the analysis of volatile aromatic hydrocarbons by combining liquid-liquid microextraction with solid phase microextraction has been developed. The analytes were extracted from aqueous samples by an immobilized polydimethylsiloxane fiber assisted by the droplets of an appropriate organic solvent. Benzene, toluene, ethylbenzene, and o-xylene were used as target analytes. The main factors potentially affecting the microextraction such as the nature and the volume of organic solvent, polydimethylsiloxane (PDMS) swelling, extraction time, agitation, temperature, and salts were optimized. The method requires a very low consumption of organic solvent. The relative enrichment factor is in the range of 7.1-32.4 for extraction in the presence of dichloromethane at an optimum volume of 18 μL mL(-1) of aqueous sample. This enhancement over regular polydimethylsiloxane fiber is primarily the result of the fiber swelling and of a stable thin layer of organic solvent attached to the surface of the PDMS fiber. The limit of detection ranges from 0.02 to 0.65 ng mL(-1) for the target compounds using a 7-μm bonded polydimethylsiloxane coating and a flame ionization detector. The validity of this method is demonstrated by the analysis of a real waste water sample.

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Section: Resultsmentioning

confidence: 99%

“…Quantitative evaluation in this microextraction method was performed by the external standard method [] under optimal conditions using GC–FID. The chromatographic conditions were similar for all experiments.…”

Section: Resultsmentioning

confidence: 99%

Solid phase microextraction assisted by droplets‐based liquid–liquid microextraction for analysis of volatile aromatic hydrocarbons in water by gas chromatography

Ciucanu

Agotici

2012

J of Separation Science

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Droplets-based microextraction assisted SPME for GC-MS analysis of polar compounds such as clopyralid in water

et al. 2014

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For the first time, we assessed the performance of liquid phase microextraction (LPME) with droplets of organic solvent that assists solid phase microextraction (SPME) with chemically bonded polydimethylsiloxane (PDMS) fiber for analysis by gas chromatography-mass spectrometry of trace amounts of polar compounds in water. Clopyralid was used as a target analyte. LPME with droplets was performed with dichloromethane and was compared with dispersive liquid-liquid microextraction (DLLME) by addition of acetone or methanol as disperser solvent to dichloromethane. The main factors potentially affecting the microextraction were optimized. The optimal volume of dichloromethane was 17 mL per mL of aqueous samples. The relative enrichment factor for LPME in the presence of dichloromethane droplets was 200 and decreased by addition of disperser solvent. Consequently, DLLME cannot be applied with this SPME fiber. A characteristic of the method is that LPME and SPME can be conducted simultaneously or in two steps in the same vial. The limit of detection and the limit of quantification were 0.02 mg L À1 and 0.07 mg L À1 , respectively for 7 mm chemically bonded PDMS fiber and mass spectrometric detection was also carried out.

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Quantitative evaluation of perchlorethylene in groundwater before and after its oxidation by helical solid sorbent extraction and gas chromatography

Cited by 2 publications

References 11 publications

Solid phase microextraction assisted by droplets‐based liquid–liquid microextraction for analysis of volatile aromatic hydrocarbons in water by gas chromatography

Solid phase microextraction assisted by droplets‐based liquid–liquid microextraction for analysis of volatile aromatic hydrocarbons in water by gas chromatography

Droplets-based microextraction assisted SPME for GC-MS analysis of polar compounds such as clopyralid in water

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