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Air-sampling of aldehydes—Application to chromatographic determination of formaldehyde and acetaldehyde (1984)

Guenier, J. P. ; Simon, P. ; Delcourt, J. ; [et al.]

Springer

Chromatographia 18 (1984), S. 137-144

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ISSN: 1612-1112

Keywords: Aldehydes and ketones ; 2,4-dinitrophenylhydrazine-coated silica gel ; Gas chromatography ; Column liquid chromatography ; Pollution

Source: Springer Online Journal Archives 1860-2000

Topics: Chemistry and Pharmacology

Notes: Summary After a brief review of several methods described in the literature this paper discusses air-sampling on 2,4-dinitrophenylhydrazine-coated silica gel and identification requirements for aldehydes and ketones most commonly found in industrial pollution. Quantitative analysis of formaldehyde and acetaldehyde either by GC or by HPLC techniques is established using a dynamic system producing test atmospheres and compared with the usual colorimetric determinations.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF02258770

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Etude par Spectroscopie et Microscopie Raman de Phases Oxyde de Molybdène Déposé sur Alumines (1980)

Sombret, B. ; Dhamelincourt, P. ; Wallart, F. ; [et al.]

Chichester [u.a.] : Wiley-Blackwell

Journal of Raman Spectroscopy 9 (1980), S. 291-296

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ISSN: 0377-0486

Keywords: Chemistry ; Analytical Chemistry and Spectroscopy

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology , Physics

Notes: Raman spectroscopy and microscopy have been used to study some catalysts: Mo supported on alumina. Different Mo species were found, depending upon the amount of molybdenum deposited on the carrier. At low coverages (4% wt MoO3) distorted molybdate tetrahedra were observed. Increasing the surface coverage resulted in the formation of a polymolybdate phase with octahedrally surrounded molybdenum. Additionally, ‘bulk MoO3’ appeared when amounts were above 16% wt MoO3. When the supports were washed during their preparation with aqueous NH4OH and HNO3 solutions, preferential formation of polymolybdate phase was observed. In case of washing with alkaline solution ‘free MoO3’ was also detected. Finally using the Raman microprobe MOLE, a map giving the distribution of the different species at the surface of support was obtained.

Additional Material: 7 Ill.