Determination of Traces of Ketone in Carbinol by Differential Infrared Analysis

1957 ◽  
Vol 29 (3) ◽  
pp. 346-347 ◽  
Author(s):  
W. H. Washburn ◽  
F. A. Scheske
Keyword(s):  
Infrared Analysis

scholarly journals The Determination of Nitric Oxide in Gas Phase Cigarette Smoke by Non-dispersive Infrared Analysis

1980 ◽  
Vol 10 (2) ◽  
Author(s):  
T. B. Williams
Keyword(s):  
Nitric Oxide ◽  
Gas Phase ◽  
Cigarette Smoke ◽  
Relative Error ◽  
Dead Volume ◽  
High Yield ◽  
Infrared Analysis ◽  
Colorimetric Analysis ◽  
Standard Gas

AbstractNitric oxide in cigarette smoke was conveniently determined by non-dispersive infrared analysis (NDIR). Recoveries of 95 % were obtained with standard gas-air mixtures but recoveries from smoke increased from 87% for high-yield to 91 % for low-yield cigarettes. Relative error was about 4 %. A reduction in the dead volume of Cambridge filter cassettes, to reduce the amount of NO reacted between puffs, increased NO deliveries of cigarettes by 4%. Deliveries of NO were estimated to average 4 % lower due to oxidation, but reaction with other smoke components reduced them further depending upon concentrations. The NO deliveries of cigarettes increased as blend nitrate increased and as the flow of air around cigarettes decreased. Nitric oxide in smoke and in standard gas-air mixtures, determined by non-dispersive infrared (NDIR) spectroscopy, was substantiated by an automated colorimetric analysis. Interfering smoke species were determined and circumvented in both methods.

Gas Chromatographic Determination of Trans Unsaturation in Margarine: Collaborative Study

1985 ◽  
Vol 68 (1) ◽  
pp. 46-51 ◽  
Author(s):  
Lawrence Gildenberg ◽  
David Firestone
Keyword(s):  
Methyl Ester ◽  
Statistical Data ◽  
Methyl Esters ◽  
Collaborative Study ◽  
Chromatographic Determination ◽  
Infrared Analysis ◽  
Trans Unsaturation ◽  
Coefficients Of Variation ◽  
International Collaborative Study

Abstract An international collaborative study of a gas chromatographic (GC) method for the determination of trans unsaturation in margarine was conducted in 1980. Thirteen collaborators analyzed a set of 2 of 3 known mixtures of methyl esters and 4 margarine methyl ester samples. Two of the margarine methyl ester samples were blind duplicates. The experimental data were subjected to statistical analysis to determine within- and between-laboratory variation. The statistical data were in excellent agreement with data from a collaborative study of the AOACIUPAC GC method for the determination of methyl esters of fatty acids. Coefficients of variation (CVs) for components in the range of 4-40% were comparable (CV 2-6% for soybean oil methyl esters (AOAC-IUPAC study) as well as for margarine methyl esters (this study)). Good recoveries of total trans acids were obtained and betweenlaboratory as well as within-laboratory CVs were consistently better for the determination of total trans acids by GC vs infrared analysis. The GC method for determining trans unsaturation in margarine has been adopted official first action.

Multivariate Determination of Sugar Powders by Attenuated Total Reflectance Infrared Spectroscopy

1993 ◽  
Vol 47 (4) ◽  
pp. 452-457 ◽  
Author(s):  
N. Dupuy ◽  
M. Meurens ◽  
B. Sombret ◽  
P. Legrand ◽  
J.P. Huvenne
Keyword(s):  
Quantitative Analysis ◽  
Attenuated Total Reflectance ◽  
Infrared Spectrometry ◽  
Infrared Analysis ◽  
Total Reflectance ◽  
Regression Methods ◽  
Peak Resolution ◽  
Atr Spectroscopy ◽  
Time Required

Thanks to what has been achieved by Fourier transformation, infrared analysis can now become a state-of-the-art device in quality control laboratories if we consider its precision and the gain in time it ensures. Moreover, an increasing number of new mathematical regression methods such as partial least-squares (PLS) regression allow multicomponent quantitative analysis in mixtures. Nevertheless, the efficiency of infrared spectrometry as a quantitative analytical method often depends on the choice of an adequate presentation for the sample. For quantitative analysis of powders, sampling appears difficult in the mid-IR. We have developed a method built on three advantages: the rapidity of Fourier transform spectroscopy, fast solvent elimination, and good peak resolution. For enhancing peak intensity on attenuated total reflectance (ATR) spectroscopy we use nondissolving and evaporating liquids. For instance, the analysis of three components (glucose, fructose, and sucrose) can be done with a precision in the range of 4%, whereas the time required to obtain an analysis report is about 5 min.

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