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

Abstract

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.

Determination of halogenated hydrocarbons in urine samples using a needle trap device packed with Ni/Zn–BTC bi-MMOFviathe dynamic headspace method

“…The highest peaks appeared in the range of 268-281 C and 3-4 min due to the interaction of the two parameters of temperature and desorption time, respectively, which is consistent with other similar studies. [9][10][11]38 According to the results, increasing the temperature and desorption time to a certain range has increased the performance of the sampler, while a further increase in temperature and desorption time has reduced the thermal desorption performance of the studied analytes (see Fig. 7).…”

A review of new adsorbents for separation of BTEX biomarkers

“…Needle trap devices (NTDs) were first introduced in 2001 by Pawliszyn (Koziel et al, 2001) and are interesting owing to their good performance for analyzing volatile compounds in urine, blood and plasma samples. In the NTD microextraction method, volatile compounds can be sampled, extracted, prepared and quantified in one step in different matrices (Kędziora & Wasiak, 2017; Koziel et al, 2001; Zeverdegani, Bahrami, Rismanchian, & Shahna, 2014). For thermal desorbing and extracting analytes collected by needle traps, the needles are placed directly into the gas chromatogram injection port and the analytes enter the column with inert gas movement at high temperatures (Koziel et al, 2001).…”

Development of Cold Fiber Head Space Solid-Phase Microextraction for Analysis of 2,5 Hexandion in Urine

“…Over the last decade, several methods based on solid phase microextraction are reported in the analysis of pollutants in air and extraction of analytes from urine samples [10][11][12][13][14][15][16][17]. The most developed methods to determine volatile biological indexes in urine samples are static or dynamic headspace and head space-solid phase microextraction (HS-SPME).…”