Development of a needle trap device packed with the Schiff base network-1/single-walled carbon nanotube for sampling phenolic compounds in air

Khotbesara, Negar Safarpour; Bahrami, Abdulrahman; Mohraz, Majid Habibi; Afkhami, Abbas; Farhadian, Maryam

doi:10.1016/j.microc.2021.106984

Cited by 7 publications

(2 citation statements)

References 29 publications

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“…NTE for bovine respiratory disease diagnosis via cattle breath analysis was developed, though not enough evidence was obtained to create a useful profile of volatile organic compounds (VOC) (21). VOC analysis via NTE of fecal and tissue samples from cattle and goats identified a bacterial culture (22). With optimization, VOC emissions could be monitored for diagnosis of paratuberculosis in livestock.…”

Section: Disease Diagnosismentioning

confidence: 99%

Harmonization of Experimental Methods Used to Measure the True Hold-Up Volume of Liquid Chromatography Columns

Gritti

Smith

2023

LCGC N. Am.

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There are as many measurement values of the true column hold-up volume, V0, as techniques applied to evaluate this most important property in liquid chromatography (LC). The relative errors made on V0 measurements using conventional “non-retained” markers—such as acetone, uracil, or thiourea in reversed-phase liquid chromatography (RPLC), or benzene or acenaphthene in hydrophilic interaction chromatography (HILIC)—can be as large as ±30%. This situation is extremely confusing for LC users who wish to classify and predict the retention behavior of LC columns. In this work, along with advances in mass spectrometry (MS) instrumentation, the hold-up volume of any LC column—including, but not limited to, RPLC, HILIC, ion exchange chromatography (IEX), and mixed-mode columns—is accurately measured by injecting labeled deuterated acetonitrile (CD3CN) molecules and detecting them selectively by MS-single ion reaction (m/z = 45) using non-labeled and pure acetonitrile (CH3CN) as the eluent. This proposed harmonization of all conventional V0 measurement methods is illustrated and successfully applied to RPLC, HILIC, anion exchange (AEX), and RP-AEX mixed-mode chromatography, irrespective of the mobile phase composition selected.

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Section: Disease Diagnosismentioning

confidence: 99%

Harmonization of Experimental Methods Used to Measure the True Hold-Up Volume of Liquid Chromatography Columns

Gritti

Smith

2023

LCGC N. Am.

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Section: Disease Diagnosismentioning

confidence: 99%

Does High Polarity Mean High Retention on Stationary Phases in Gas Chromatography?

Snow

Rana

2023

LCGC N. Am.

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Stationary phase chemistry, polarity, and selectivity have been of ongoing interest since the inception of gas chromatography (GC) in the 1950s. In the early days when most analyses were performed on packed columns, there were hundreds of stationary phase materials available. Today, with modern capillary columns, most GC analyses are performed with a few stationary phases, with a wide array of choices for specialty applications. Stationary phases are often classified using the broad term polarity, with polar stationary phases recommended for separating polar analytes and nonpolar stationary phases recommended for nonpolar analytes. In this installment, we examine the idea of stationary phase polarity. We examine the assumptions inherent in the most popular stationary phase polarity evaluating systems—McReynolds constants and the polarity scale. We see that high polarity does not always mean greater retention or higher selectivity.

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Modified activated carbon derived from chestnut oak shells as a new sorbent for the needle‐trap extraction

Ehteshami¹,

Mohammadiazar

Haddad³

et al. 2022

J of Separation Science

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In this study, an acid-treated-activated carbon was prepared from chestnut oak shell carbonization followed by modification with hydrochloric acid/nitric acid and then used as a new sorbent for headspace needle-trap extraction of chlorophenol compounds from aqueous solutions. Different techniques, including scanning electron microscopy, nitrogen adsorption-desorption analysis, and Fourier transform-infrared spectroscopy were used for the characterization of the sorbents. The effects of some experimental parameters, including the temperature, pH, sorbent amount, and time of extraction were optimized. The developed method is fast and sensitive, providing low and sub ng/L detection limits. The limits of detection and quantification were in the range of 0.75-5 and 5-15 ng/ml, respectively, and the equilibrium time was 20 min. Wide linearity in the range of 15-2000 ng/L with R 2 > 0.9993 was obtained. Repeatability of the method was accessed at 50, 100, and 200 ng/L concentration levels and RSD% of 5%-12% was achieved. The introduced method was applied for analyzing real water samples containing spiked chlorophenols, and the relative recovery values were found to be in the range of 84%-99% at the concentration levels of 50, 100 and 200 ng/L.

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Development of a needle trap device packed with the Schiff base network-1/single-walled carbon nanotube for sampling phenolic compounds in air

Cited by 7 publications

References 29 publications

Harmonization of Experimental Methods Used to Measure the True Hold-Up Volume of Liquid Chromatography Columns

Harmonization of Experimental Methods Used to Measure the True Hold-Up Volume of Liquid Chromatography Columns

Does High Polarity Mean High Retention on Stationary Phases in Gas Chromatography?

Modified activated carbon derived from chestnut oak shells as a new sorbent for the needle‐trap extraction

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