Quantitative Analysis Of Organic Compounds Research Articles

Comparison between the organic fraction of suspended matter at a background and an urban station

Airborne particulate matter was sampled near the Cosmic Ray Laboratory of Chacaltaya, Bolivia, about 25 km NE of La Paz, at an altitude of 5200 m. Quantitative analysis of organic compounds was performed on two combined samples by gas chromatography-mass spectrometry with computerized data acquisition. Results are presented for aliphatic and polyaromatic hydrocarbons, fatty acids and heterocyclic arenes. A comparison is made with the results obtained from samples collected in a residential city area of Antwerp, Belgium. Polyaromatic hydrocarbons are found to be present in lower concentrations in the Bolivian samples by a factor of 10 to 300. For other compounds no meaningful differences are observed. The amount of the total suspended particulate matter per unit of volume is about three times lower in the remote area compared to the residential area.

Fast quantitative analysis of organic compounds in air-borne particulate matter by gas chromatography with selective mass spectrometric detection

A method is described for the quantitative determination of the major organic constituents of airborne particulate matter. Organic compounds are isolated from the aerosol by Soxhlet extraction with benzene and methanol. Quantification is performed by the internal standard technique using a mass chromatographic approach. Results obtained for parallel samples of suspended matter demonstrate that the precision of the proposed method is within 10%. Sensitivity has been sacrificed in order to allow the quick determination of about 60 organic compounds within 48 h after sampling.

The determination of compounds by use of chromatography on thin-layer chromatostrips.

A technique is described for the quantitative analysis of organic compounds by chromatography on narrow strips of glass plate bearing a thin layer of adsorbent. A relationship between the length, L, of the zone occupied by a compound, the weight, C, of compound applied and the distance, D, travelled by the developing solvent, viz., L= K log C log D(where K is a constant), has been found to hold under specified conditions and can be used to determine organic compounds alone or in admixture.

Quantitative Analyses by Extremely Low-Resolution Infrared Spectroscopy

During the past 20 years, infrared spectroscopy has become one of the most important tools for the quantitative analysis of organic compounds. The manufacturers of infrared spectrometers are constantly striving to increase the resolution and have succeeded remarkably well.

Mass-spectrometric analysis of heptanols

MASS-spectrometric methods of identification and quantitative analysis of organic compounds are based on correlations between the molecular structures and the distribution of intensities in their mass-spectra. The investigation of the mass-spectra of hydrocarbons made it possible to establish several relations to determine the types of hydrocarbons in such complex mixtures as petroleum fractions [1-4]. Problems of mass-spectrometric analysis of alcohols are discussed in the literature to a considerably lesser extent. This report discusses results of an investigation of the mass-spectra of heptan-l-ol, heptan-2-ol, heptan-3-ol and hcptan-4-ol and a mixture of C 7 alcohols separated from products of oxidation of n-heptane in the presence of boric acid [5]. The physical constants of individual alcohols-density, refractive index, boiling point and methods of preparation are described in reference [5]. The study was carried out in MKh-1303 and MS-1 mass-spectrometers modified according to the description given ealier [2]. Operating conditions.

Qualitative and Quantitative Analysis of Organic Compounds. Use of Low-Voltage Mass Spectrometry

Qualitative and Quantitative Analysis of Organic Compounds. Use of Low-Voltage Mass Spectrometry