A New PVC-Activated Charcoal Fiber Coated on Silver Wire; Application in Determination of n-Alkanes in the Headspace of Soil Samples by SPME-GC

Farajzadeh, M. A.; Matin, Amir Abbas

doi:10.2116/analsci.18.77

Cited by 34 publications

(13 citation statements)

References 13 publications

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“…In a previous work [42], the authors proposed a SPME fiber based on metallic wire. In this study, the similar procedure was used in coating stir bar with a suitable sorbent.…”

Section: Preparation Of Coated Stir Barmentioning

confidence: 99%

Coupling stir bar sorptive extraction‐dispersive liquid–liquid microextraction for preconcentration of triazole pesticides from aqueous samples followed by GC‐FID and GC‐MS determinations

Farajzadeh

Djozan

Nouri

et al. 2010

J of Separation Science

105

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Stir bar sorptive extraction (SBSE) combined with dispersive liquid-liquid microextraction (DLLME) has been developed as a new approach for the extraction of six triazole pesticides (penconazole, hexaconazole, diniconazole, tebuconazole, triticonazole and difenconazole) in aqueous samples prior to GC-flame ionization detection (GC-FID). A series of parameters that affect the performance of both steps were thoroughly investigated. Under optimized conditions, aqueous sample was stirred using a stir bar coated with octadecylsilane (ODS) and then target compounds on the sorbent (stir bar) were desorbed with methanol. The extract was mixed with 25 microL of 1,1,2,2-tetrachloroethane and the mixture was rapidly injected into sodium chloride solution 30% w/v. After centrifugation, an aliquot of the settled organic phase was analyzed by GC-FID. The methodology showed broad linear ranges for the six triazole pesticides studied, with correlation coefficients higher than 0.993, lower LODs and LOQs between 0.53-24.0 and 1.08-80.0 ng/mL, respectively, and suitable precision (RSD < 5.2%). Moreover, the developed methodology was applied for the determination of target analytes in several samples, including tap, river and well waters, wastewater (before and after purification), and grape and apple juices. Also, the presented SBSE-DLLME procedure followed by GC-MS determination was performed on purified wastewater. Penconazole, hexaconazole and diniconazole were detected in the purified wastewater that confirmed the obtained results by GC-FID determination. In short, by coupling SBSE with DLLME, advantages of two methods are combined to enhance the selectivity and sensitivity of the method. This method showed higher enrichment factors (282-1792) when compared with conventional methods of sample preparation to screen pesticides in aqueous samples.

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“…In a previous work [42], the authors proposed a SPME fiber based on metallic wire. In this study, the similar procedure was used in coating stir bar with a suitable sorbent.…”

Section: Preparation Of Coated Stir Barmentioning

confidence: 99%

Coupling stir bar sorptive extraction‐dispersive liquid–liquid microextraction for preconcentration of triazole pesticides from aqueous samples followed by GC‐FID and GC‐MS determinations

Farajzadeh

Djozan

Nouri

et al. 2010

J of Separation Science

105

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show abstract

“…In previous work, we reported a new SPME fiber based on a solid sorbent (activated charcoal) in a polymeric matrix (PVC) coated on silver wire and its application in solid phase microextraction of aliphatic hydrocarbons from the gaseous phase and the headspace of contaminated soil samples prior to their analysis by capillary gas chromatography [20]. In continuing studies, we have used another fiber based on porous cellulose acetate on the metallic base.…”

Section: Introductionmentioning

confidence: 99%

A new selective SPME fiber for some n‐alkanes and its use for headspace sampling of aqueous samples

Farajzadeh¹,

Hatami

2003

J of Separation Science

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A new selective SPME fiber for some n-alkanes and its use for headspace sampling of aqueous samples This contribution presents a new porous solid phase microextraction (SPME) fiber based on cellulose acetate and polyvinyl chloride (PVC) coated on a metallic base. The proposed fiber is selective for n-alkanes higher than C 10 , especially for C 12 -C 15 . PVC acts as a binder and surface modifier of the fiber. Fiber preparation can be completed in less than 15 min. High capacity, chemical, thermal, and mechanical durability, low cost, and no occurrence of additional peaks in chromatograms are further advantages of the proposed fiber. The relative standard deviations obtained from a single fiber are less than 9% for all analytes. The fiber-to-fiber reproducibility is better than 18%. After optimizing experimental conditions such as fiber composition, extraction time, desorption temperature, solution volume, salting out effect, etc. the fiber can be used for sampling from the headspace of aqueous solutions containing n-alkanes (C 10 -C 20 ) in the lg/L concentration range. Detection limits of 50 -150 lg/L are obtained on use of capillary gas chromatographic separation and flame ionization detection. The microextraction procedure is rapid and equilibration takes less than 20 min.

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“…18 In previous work, we proposed a new SPME fiber based on a solid sorbent (activated charcoal) in a polymeric matrix (PVC) coated on silver wire and we reported its application to the solid phase microextraction of aliphatic hydrocarbons from the gaseous phase and the headspace of contaminated soil samples prior to their analysis by capillary gas chromatography. 19 In succeeding studies, we used this fiber for the analysis of nalkanes from aqueous samples in direct mode of SPME. Fiber efficiency in direct mode is comparable or better than its efficiency in headspace mode.…”

mentioning

confidence: 99%

Analysis of n-Alkanes at Sub Microgram per Liter Level after Direct Solid Phase Microextraction from Aqueous Samples

Farajzadeh

Hatami

2002

ANAL. SCI.

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A New PVC-Activated Charcoal Fiber Coated on Silver Wire; Application in Determination of n-Alkanes in the Headspace of Soil Samples by SPME-GC

Cited by 34 publications

References 13 publications

Coupling stir bar sorptive extraction‐dispersive liquid–liquid microextraction for preconcentration of triazole pesticides from aqueous samples followed by GC‐FID and GC‐MS determinations

Coupling stir bar sorptive extraction‐dispersive liquid–liquid microextraction for preconcentration of triazole pesticides from aqueous samples followed by GC‐FID and GC‐MS determinations

A new selective SPME fiber for some n‐alkanes and its use for headspace sampling of aqueous samples

Analysis of n-Alkanes at Sub Microgram per Liter Level after Direct Solid Phase Microextraction from Aqueous Samples

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