ANALYSIS SPEEDED BY AUTOMATIC INFRARED SPECTROPHOTOMETER Gives Detailed Transmission Curves for Gases, L i q u i d s , and M a n y Solids Cambridge, Mass., Apr. 2 — Valuable saving in analytical time results from the application of infrared transmission techniques in the automatic recording spectrophotometer developed here by Baird Associates, Inc. The instrument produces detailed infrared spectrograms for gases, liquids, thin solid films, and solids capable of being dissolved or suspended in infrared-transparent liquids. The spectrogram is produced as an ink-drawn line on a paper chart which is carried by a motor-driven drum. The chart is graduated in percent transmission from zero to one hundred, as ordinates, and in wavelength from two to sixteen microns, as abscissae. Both scales are linear. The chart is 22 inches long and 6V2 inches wide, with space provided for tabulating data pertaining to the record. The complete spectrogram is recorded in approximately twelve minutes. The infrared spectrophotometer is valuable in such applications as analysis of mixtures, quality control, detection o f slight impurities and of variation from a standard, and general chemical problems. The double-beam principle employed in the Baird Associates instrument makes possible the differential analysis of two samples, showing slight impurities and variations from a standard. The instrument may also be used to determine reaction rates. In this application, the scanning mechanism is stopped at a wavelength where strong absorption by one of the reaction products is noted and the reaction rate is determined by observing the change in the sample's transmission with time. In most instances, the infrared a b sorption of any chemical compound is the same regardless of how or where it is mixed with similar or dissimilar compounds. From the spectrogram of a mixture, the individual components can be identified by their characteristic absorption regions. And because the degree of absorption at any wavelength is a function of the concentration of individual components, the spectroscopist can obtain quantitative as well as qualitative analysis from the transmission curve for a mixture. Requiring no specialized skills in its operation, the automatic recording infrared spectrophotometer reduces many complex analyses to routine tasks for a laboratory technician. Thus the instrument expands the scope of the spectroscopist's work by relieving him of all but the interpretive portion of the analysis, in which his knowledge is most valuable. Advertisement of Baird Associates, Inc.
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The infrared spectrogram written by the Baird Associates spectrophotometer includes the autograph of each component in a complex mixture of gases or liquids, as well as in some solids, — revealing, by characteristic absorption bands, the presence of even small quantities of the separate substances which compose the mixture. This analytical method is rapid, simple, dependable — of demonstrated value to chemists in diverse industries. Write for.; bulletin X X X describing the double-beam infrared recording spectrophotometer and its uses.
Baird Associates, 3 3 UNIVERSITY
ROAD
Baird Associates will gladly confer with you regarding the application of this instrument to your needs.
Inc.
CAMBRIDGE 3 8 ,
MASS.
