Peak Area Method Research Articles

The A value of the deuterioamino group determined by the nuclear magnetic resonance peak area method at -93.deg.

The A value of the deuterioamino group determined by the nuclear magnetic resonance peak area method at -93.deg.

Digital methods of photopeak integration in activation analysis

A study of the precision attainable by several methods of gamma-ray photopeak integration has been carried out. The 'total peak area' method, the methods proposed by Covell, Sterlinski, and Quittner, and some modifications of these methods have been considered. A modification by Wasson of the total peak area method is considered to be the most advantageous due to its simplicity and the relatively high precision obtainable with this technique. A computer routine for the analysis of spectral data from nondestructive activation analysis experiments employing a Ge(Li) detector-spectrometer system is described.

The A-value of hydroxyl determined by the nuclear magnetic resonance peak area method at -83.deg.

The A-value of hydroxyl determined by the nuclear magnetic resonance peak area method at -83.deg.

Gas Chromatographic Determination of N-γ-Phenylpropyl-N-benzyloxy Acetamide (W-1372) in Blood

A procedure is described for the determination of N-γ-phenylpropyl-N-benzyloxy acetamide (W-1372) in plasma or whole blood. W-1372 is extracted from plasma with hexane and measured quantitatively by gas chromatography. The technique is simple, reproducible, and accurate in the range of 1-10 mcg./ml. Dibutyl phthalate is used as the internal standard for quantitation by the relative peak area method.

The gas chromatographic analysis of lacquer thinner.

By using high sensitive gas chromatogrph (equiped with flame ionization detector, sensitivity: 2mV/200mm full scale) 46 commercial laquer thinners and 10 organic solvents used in three industries (in Kyoto City) were analyzed.Tricresylphosphate (supported on firebrick C-22, 80-100 mesh) was used as stationary phase and maintained at 100°C. Column sizes were 4mm I.D. and 4m L. The purified nitrogen was used as the carrier gas and its flow rate was regulated at 38-40ml/min. Each sample solvent of 4-8μl was injected into the gaschromatographic system by microsyringe.Each peak appeared on the chromatogram was identified by comparing with the relative retention volumes (VR) for the standard substances (VR of benzene=1.000). The quantitative determination of component was performed by applying the peak area method (half band width method).The results were as follows:1. On each chromatogram, 12-43 organic components were identified.2. The average concentration of the contents classified by chemical structures were as follows: aromatics 36%, aliphatics 11%, chlorides and alcohols 10%, acetates 7%, ketone 1%, and aldehyde 0.3% respectively.3. The average concentrations of important components which could be detected were as follows: toluene (17%), total xylene (m.p.o.) (12%), benzene (7%), trichloroethylene (6%), butylalcohol (n.i. sec. tert.) (5%), tetrachroroethylene (4%), methylmetacrylate (3%).4. Among the detected components in sample solvents, the concentration of benzene was the highest (48%).

Application of differential thermal analysis to polyethylene blends

AbstractThe analytical application of differential thermal analysis (DTA) for the identification and evaluation of a number of polyethylene blends is described. New DTA data are presented for hompolymer blends of low and intermediate density polyethylenes and low and high density polyethylenes whose degrees of branching are sufficiently different. The concentration by weight of each of the crystalline components in the blend is determined from DTA thermograms by the peak area method and the melting point‐density method. The density of polyethylenes and polyethylene blends is determined with the use of density gradient columns.

Gamma-Ray Spectra Analysed by Computer Programme Using the Peak Area Method

Computer program for instrumental neutron activation analysis of chemical abundances in meteorites, examining gamma-ray spectra

Studies on the Precision of Various Composite Calculations in Gas-Chromatography

In the estimation of gas-chromatography, we feel that calculations per the peak area method is most appropriate. However, even in this method there are many known processes, such as calibration curve and internal standard methods.All of these methods are similar in that calculations are made from peak area, therefore, the accuracy of the estimated results can also be calculated from the deviation of the peak area.Assuming the deviation, (σ) of the peak area as the linear of the area, estimated result σ was obtained through calculations. By further experiments σ was actually measured and it was proven to coincide with the results obtained by calculations.From this results it was discovered that the comparison of relative area was the best calculating method, followed by the internal standard method and the relative calibration curve. It was proven that the addition method produced poor precision and is unsuitable.Furthermore, majority of the error in gas-chromatography is due to the error in the area measurements, therefore, it is our conclusion that to improve the precision of gas-chromatography a better area measuring method must be studied.