A needle trap device packed with a sol–gel derived, multi-walled carbon nanotubes/silica composite for sampling and analysis of volatile organohalogen compounds in air

This paper describes a new extraction technique with needles and a sorbent based on carbon nanotubes to analyze trace amounts of three isomers of xylenes in aqueous samples. In this research, results have been compared with one commercial sorbent. The synthesized sorbent was prepared using sol-gel technology and was packed into 20 gauge needles, and the same size needle was used for packing the commercial sorbent. In the extraction process, a purge and trap sampling methodology is developed, so purging and trapping cycles were performed by a sampling pump. Optimized conditions for standard xylene samples have been obtained, and eight urine samples from workers that were exposed to xylene in the workplace were collected and analyzed. Experimental parameters such as limits of detection and quantification were investigated, and these two parameters were <1 μg/L.

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“…). Also in one study, results have been shown that multiwalled CNTs in the determination of halogenated VOCs are better than PDMS .…”

Section: Resultsmentioning

confidence: 99%

Analysis of xylene in aqueous media using needle‐trap microextraction with a carbon nanotube sorbent

Zeverdegani

Bahrami

Rismanchian

2014

J of Separation Science

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“…The NTD used for analysis of environmental and occupational monitoring of benzene was checked for its validity. However, comparable information for the SPME sampler using thermal desorption was not presented [38,44]. Generally, the monitoring of low range environmental concentrations of benzene in the ppb range concentration has been reported by using the EPA method [45].…”

Section: Resultsmentioning

confidence: 99%

Validation of a New Method for the Monitoring of Environmental Benzene at Low Concentration Using the Needle Trap Device

Bayatian¹,

Azari²,

Ashrafi³

et al. 2018

J Pollut Eff Cont

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a headache, drowsiness, nausea, dizziness, confusion, severe damage to the kidney, the liver and the nervous system, and the irritation of the nose were reported [12-15]. Acute exposure through inhalation can cause illnesses such as headaches, drowsiness, dizziness, and irritation of the skin, whereas chronic exposure may cause more severe ailments, including aplastic anemia and leukemia at the occupational settings [16,17]. Due to its potential health threats, in according to the International Agency for Research on Cancer (IARC) classified, benzene is a group 1 human carcinogen [18].

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“…Before considering any results of the parame ters related to GC response, the carryover of the ana lytes of interest on SPME coated with SWCNTs/silica 18 composite should be determined. Investigation of the carryover percentage is necessary for determining con ditioning time and prevention of memory effect on further analysis.…”

Section: Resultsmentioning

confidence: 99%

“…The combination of carbon nanotubes (CNTs) sci ence with sol−gel chemistry allows synthesizing proper sorbents [17][18][19][20] tages of CNTs and sol−gel technology. CNTs, essen tially an allotropic form of graphitic carbon, were first described in 1991 by Iijima [21].…”

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confidence: 99%

Single-walled carbon nanotube/silica composite as a novel coating for solid-phase microextraction fiber based on sol-gel technology

2015

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Single walled carbon nanotubes (SWCNTs)/silica composite coating for solid phase microextrac tion synthesized by sol−gel technology was developed for air sampling and determination of perchloroethylene, benzotrichloride, chloromethyl methyl ether and trichloroethylene. Application of this method was investigated under different laboratory conditions. Predetermined concentrations of each analyte were prepared in a home made standard chamber and the influence of temperature, humidity, extraction time, storage time, desorption temperature and desorption time was investigated. Under optimal conditions, the use of SWCNTs/silica com posite fiber showed high sensitivity and fast sampling of halogenated volatile organic compounds from air. For linearity test, the regression correlation coefficient was more than 98% for analytes of interest and linear dynamic range for the proposed fiber and the applied gas chromatography−flame ionization detector (GC−FID) technique was from 1 to 100 ng/mL Method detection limits ranged from 0.11 to 0.2 ng/mL and method quan tification limits were between 0.34 and 0.7 ng/mL. SWCNTs/silica composite fiber was highly reproducible; rel ative standard deviations were between 5.6 and 11.7%. The developed method was applied to determine per chloroethylene concentration of real air samples of a dry cleaning shop and the results compared with the data obtained with commercially available carboxen/polydimethylsiloxane (CAR/PDMS).

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A needle trap device packed with a sol–gel derived, multi-walled carbon nanotubes/silica composite for sampling and analysis of volatile organohalogen compounds in air

Cited by 51 publications

References 26 publications

Analysis of xylene in aqueous media using needle‐trap microextraction with a carbon nanotube sorbent

Analysis of xylene in aqueous media using needle‐trap microextraction with a carbon nanotube sorbent

Validation of a New Method for the Monitoring of Environmental Benzene at Low Concentration Using the Needle Trap Device

Single-walled carbon nanotube/silica composite as a novel coating for solid-phase microextraction fiber based on sol-gel technology

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