NEWS
CARVER LABORATORY PRESS
Standard For Research ... solves the pressing problem of forming KBr Pellets Many insoluble materials, mixed with Potassium Bromide, can be formed in a die under pressure into pellets or wafers for quantitative and quali tative analysis. The CLP supplies the pressure - up to 40,000 lbs., if needed. This specific use is only one of the ways this versatile laboratory assist ant meets the challenge of research and development. S o m e o f the many
uses
are:
μ * Dehydrating k* Pressing out various oils, stéarines and waxes k * Pressure filtering of thick fluids k* Compression tests k* Fatty acid determinations k* Plastic molding, forming and blocking k * Embossing and forcing W Pressing mother liquors from crystals k* Extracting Vaccines and Viruses Illustrated is the Standard (10 Ton) CARVER LABORATORY PRESS complete with Gauge. 20 Ton Models also available - additional Standard Accessories for other applications can be supplied.
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FRED S. CARVER INC. HYDRAULIC 54
RIVER
ROAD,
EQUIPMENT SUMMIT,
N.
J.
Circle No. 28 A on Readers' Service Card, page 91 A
28 A
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ANALYTICAL CHEMISTRY
It is dissolved in a solvent such as methyl chloride or toluene for addition to diatomaceous earth acting as the support. Heating under vacuum removes most of the solvent. A preliminary conditioning with the carrier gas, helium, under moderately high temperatures removes final traces of solvent. Pre-hcating with a resistance wire on the inlet system brings the carrier gas to operating temperatures and gives instant volatilization of samples. A similar post heater prevents condensate from collecting in the outlet tube. Liquid samples are injected into the eolumn^with a syringe through a neoprene serum stopper. Solid samples are injected by either displacement from the syringe needle after melting or by use of a non-interfering solvent for the solid. Hot-wire thermal conductivity cells are used for detection. The sensing elements have 0.002-in.-diameter platinum filaments. An aluminum block serves as support and heat sink for the cells. A standard bridge circuit is used with the conductivity cells and a recording potentiometer provides a convenient means of recording the chroma togram. Sensitive Operation. Dal Nogare gave some details of operating characteristics of the high temperature gas chromatography apparatus. Five phthalate esters were separated in a 9 mm X 20 in. column in less than 10 minutes using a helium flow of 124 cc. per minute. Only 2 μΐ. of the mix ture were used with a 5-mv. full scale recorder for these chromatograms. A mixture of CI4 to C2o (CiS omitted) hydrocarbons and olefins was separated at 175° C. Complete resolution of odd and even numbered members was ob tained, although 1-mono-olefins were not differentiated from corresponding saturated hydrocarbons. At a tem perature of 226° C. Dal Nogare and co-workers obtained excellent resolu tion of saturated hydrocarbons from C12 to C26. Going up to 285° C , a Ci2 to C36 hydrocarbon mixture was sepa rated. Resolution below C26 was lim ited at a gas flow of 56 cc. per minute. A slower gas flow improved the reso lution of the lower members but the "broadening effect" reduced the peaks of the higher members below the de tection limit. Quantitative analyses were made with the high temperature apparatus using the area summation method. Applying this method to high boiling mixtures—such as adipic acid esters— Dal Nogare reports the best agreement was obtained between area and weight per cent rather than mole per cent. Maximum temperature used by Dal Nogare and others was 350° C. when
scouting condition for detection of dibenzyl sebacate impurities. However, the optimum temperature for this anal ysis proved to be 305° C. Work is underway, says Dal Nogare, to extend the technique to higher temperatures. Operating in the region of 450° C. may be possible providing thermal decomposition or rearrange ment is not limiting.
Corning to Build N e w A p p a r a t u s Plant Corning Glass Works plans to start construction of a new apparatus plant in the Corning (N.Y.) area this spring, the company announced. Completion is scheduled by the end of the year. The 176,000-square-foot building, to be used to manufacture laboratory ware, will employ 500 people initially. The new plant will be much larger than the present apparatus factory at Corning. The company also has under construc tion a new Pyrex ware plant at Green ville, Ohio.
W a t e r Analysis Course St. John's University (New York) will give a 14-week laboratory-lecture course in water analysis starting Febru ary 7. The classes, to be held on Thursday evenings, will be given at the Downtown Division, Brooklyn. The course, which will cover theory and practice of analysis of raw and indus trial waters, is designed to be of partic ular interest to municipal consultants and industrial engineers. The fee is $100. Details are available from A. J. Bartilucci, St. John's University, 96 Schermerhorn St., Brooklyn 1, Ν. Υ.
Infrared Spectroscopy Course An intensive program in infrared spectroscopy will be given at the Massa chusetts Institute of Technology, June 17 to 28. It is being presented by MIT's Spectroscopy Laboratory and Depart ment of Chemistry. The course is de signed for those interested in an intro duction to infrared instrumentation and laboratory methods and in the solution of chemical problems. The 2-week course, covering both techniques and applications, will be handled by staff members and invited guest experts. Details are available from J. M. Austin, Director of the Summer Session, room 7-103, Massachusetts Institute of Technology, Cambridge 39, Mass.
