Accession Number : AD0684558

Title :   INVESTIGATION OF HIGH TEMPERATURE GAS CHROMATOGRAPHY SUBSTRATES.

Descriptive Note : Final rept. 30 Sep 67-30 Sep 68,

Corporate Author : MONSANTO RESEARCH CORP DAYTON OHIO DAYTON LAB

Personal Author(s) : Ross,William D.

Report Date : NOV 1968

Pagination or Media Count : 54

Abstract : An expedient gas chromatographic method has been developed for the analysis of small amounts of chromium in two ferrous alloys. The method involves the direct reaction of 1,1,1-trifluoro-2,4-pentanedione (H(tfa)) with particles of the alloy with subsequent analysis of the chromium as tris(1,1,1-trifluoro-2,4-pentanedionato) chromium(III) complex in an electron capture gas chromatograph. Two types of energy sources used for accelerating the direct reactions have been evaluated, radiofrequency energy (RF) and conventional heating by a heating mantle. Both techniques were found to be useful with good accuracy resulting. Three metal trifluoroacetyl acetonates were characterized after being synthesized using the microwave energy source. These metals include iron, aluminum and chromium. Several other metals, including most of the rare earths, were quantitatively dissolved in H(tfa) utilizing an RF field. Studies are described for the simultaneous quantitative analysis for aluminum and chromium in ferrous alloys, and for the preparation of precolumn scrubbers to remove interfering excess H(tfa) and Fe(tfa)3 in the metal-H(tfa) reaction. (Author)

Descriptors :   (*CHROMIUM, *GAS CHROMATOGRAPHY), (*IRON ALLOYS, *CHROMATOGRAPHIC ANALYSIS), (*CHELATE COMPOUNDS, *PENTANONES), HALOGENATED HYDROCARBONS, FLUORINE COMPOUNDS, ELECTRON CAPTURE, RADIO FIELDS, INFRARED SPECTRA

Subject Categories : Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE