Gas Chromatography

Sparkman, O. David; Penton, Zelda E.; Kitson, Fulton G.

doi:10.1016/b978-0-12-373628-4.00002-2

Cited by 103 publications

(58 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…[1–4] Gas chromatography mass spectrometry (GC-MS) is a reliable and established technology for analyzing gases and VOCs. [1] This method is highly sensitive and capable of resolving and identifying complex mixtures of analytes. The GC-MS method suffers from several limitations.…”

mentioning

confidence: 99%

Mechanical Drawing of Gas Sensors on Paper

et al. 2012

View full text Add to dashboard Cite

This communication describes a simple solvent-free method for fabricating chemoresistive gas sensors on the surface of paper. The method involves mechanical abrasion of compressed powders of sensing materials on the fibers of cellulose. We illustrate this approach by depositing conductive layers of several forms of carbon (e.g., single-walled carbon nanotubes [SWCNTs], multi-walled carbon nanotubes, and graphite) on the surface of different papers (Figure 1, Figure S1). The resulting sensors based on SWCNTs are capable of detecting NH3 gas at concentrations as low as 0.5 part-per-million.

show abstract

mentioning

confidence: 99%

Mechanical Drawing of Gas Sensors on Paper

et al. 2012

View full text Add to dashboard Cite

show abstract

“…Currently, Fourier transform infrared spectroscopy (FTIR [ 5 , 6 , 7 , 8 ]), gas chromatography (GC [ 9 , 10 ]) and mass spectrometry (in particular coupled with GC: GC-MS [ 11 , 12 , 13 ]) are the most common laboratory-based tools whenever the constituents of the gas mixture are unknown but their identification is required. Other, more cost-effective technologies, such as e.g., metal oxide based gas sensors [ 14 ] or standalone flame ionization detectors [ 15 ], show a high degree of sensitivity to many gases, but do not allow specific detection and identification of individual gas components.…”

Section: Introductionmentioning

confidence: 99%

Monitoring the Wobbe Index of Natural Gas Using Fiber-Enhanced Raman Spectroscopy

Sandfort

Trabold

Abdolvand

et al. 2017

Sensors

View full text Add to dashboard Cite

The fast and reliable analysis of the natural gas composition requires the simultaneous quantification of numerous gaseous components. To this end, fiber-enhanced Raman spectroscopy is a powerful tool to detect most components in a single measurement using a single laser source. However, practical issues such as detection limit, gas exchange time and background Raman signals from the fiber material still pose obstacles to utilizing the scheme in real-world settings. This paper compares the performance of two types of hollow-core photonic crystal fiber (PCF), namely photonic bandgap PCF and kagomé-style PCF, and assesses their potential for online determination of the Wobbe index. In contrast to bandgap PCF, kagomé-PCF allows for reliable detection of Raman-scattered photons even below 1200 cm−1, which in turn enables fast and comprehensive assessment of the natural gas quality of arbitrary mixtures.

show abstract

“…In fact, the modified standard additions method is a combination of the conventional standard additions and internal standard calibration methods which compensate both for matrix effects on the sample response (as it is typical of the conventional standard additions calibration method) and for the intrinsic erratic nature of the GC/MS response (as it is typical of the internal standard calibration method) [10].…”

Section: A Strategy For Gc/ms Quantification Of Polar Compounds Via Tmentioning

confidence: 99%

Section: This Anticipated Very Desirable Behaviour Of Norleucine Is Cmentioning

confidence: 99%

“…In fact, as a general rule, if satisfying results are not obtained for Norleucine, hardly they will be obtained for any other analyte. Apart from that, MSAM standard additions plots of analytes are evaluated during analysis of real samples exactly as conventional standard additions plots [10].To touch by hand how the above statements operate in interpreting data from the basic experiment, the standard additions plot for Pro2TMS surrogate of Proline (calculated from data in Figure 1) is presented in Figure 4.A brute linear regression through the (TargetIonRR, AddedConc) experimental points, as for Norleucine, produces a reaction medium sample concentration of Proline of 44.5 μM which, obviously, is substantially lower than expected, even if Proline has been submitted exactly to the same events as Norleucine. Furthermore, the reaction medium sample concentration of Proline determined from the standard additions plot is affected by an uncertainty (~ ± 20%) which is much higher than the threshold of ~ ± 6% derived from the standard additions plot of Norleucine.…”

mentioning

confidence: 99%

See 1 more Smart Citation

A Strategy for GC/MS Quantification of Polar Compounds via their Silylated Surrogates: Silylation and Quantification of Biological Amino Acids

Guida¹,

Salvatore²,

Salvatore³

2015

J Anal Bioanal Tech

View full text Add to dashboard Cite

Substitution of polar functionalized compounds with silylated (e.g., trimethylsilylated) surrogates prior to GC/ MS analysis is a widely used analytical strategy. Calibration is a most demanding step of this strategy. In fact, a calibration function is usually acquired by converting known amounts of the pure analyte to its silylated surrogate using the same conditions employed for processing unknown samples. The cumbersome need of acquiring a new calibration function prevents, to a large extend, the possibility of modifying silylation and instrumental settings on a sample by sample basis as would be appropriate in a number of cases. The modified standard additions calibration method, suggested in this paper, overcomes this difficulty by integrating in a single analytical procedure calibration and sample analysis. Furthermore, the suggested procedure compensates for matrix effects which may be a serious source of inaccuracy and is a tool that can be used during method development in order to find the most suitable silylation conditions for a given analyte.The implementation and benefits of the modified standard additions calibration method are explored in this paper on the basis of a symbolic but enlightening experiment dealing with the very representative GC/MS quantification of biological amino acids via their trimethylsilylated derivatives. A Strategy for GC/MS Quantification of Polar Compounds via their Silylated Surrogates: Silylation and Quantification of Biological Amino AcidsMarco Guida 1 , Maria Michela Salvatore 1 and Francesco Salvatore 2 * 1 Dipartimento di Biologia, Università degli Studi di Napoli "Federico II", via Cintia, 21, Napoli, Italy 2 Dipartimento di Scienze Chimiche, Università degli Studi di Napoli "Federico II", via Cintia, 21, Napoli In practice, derivatization procedures are only an implementation of a general and very old principle of analytical chemistry according to which a substance to be analyzed is substituted by another substance (a surrogate) which is more easily determined than the original substance.In abstract, when a surrogate is substituted for the original analyte, calibration for quantitative analysis can take place according to one of two ways.If the surrogate is available as a pure substance and the degree of conversion of the original analyte to its surrogate is constant and known one can use pure solutions of the surrogate for calibration.On the contrary, if the surrogate cannot be isolated in a pure form and/or the degree of conversion of the original analyte to its surrogate is unknown and is dependent on the particular conditions under which substitution takes place, calibration must be performed by converting known amounts of the original analyte to its surrogate (using the same procedure employed for processing unknown samples).Because silylated compounds cannot be isolated and the efficiency of silylation procedures is usually unknown, calibration for quantitative GC/MS analysis via silylation takes always place by converting known amounts of the pure...

show abstract

Gas Chromatography

Cited by 103 publications

References 0 publications

Mechanical Drawing of Gas Sensors on Paper

Mechanical Drawing of Gas Sensors on Paper

Monitoring the Wobbe Index of Natural Gas Using Fiber-Enhanced Raman Spectroscopy

A Strategy for GC/MS Quantification of Polar Compounds via their Silylated Surrogates: Silylation and Quantification of Biological Amino Acids

Contact Info

Product

Resources

About