August,
1967
FISHER PRODUCT
REPORT
News about instruments, apparatus and reagent chemicals that make your work quicker, surer, safer and easier.
Fisher's Dual-Column Chromatographs simplify gas analysis
Figure 1—Typical chromatogram of fixed gases made with a Fisher Gas Partitioned
MODEL 29
Figure 2—Analysis of mixture containing sulfur gases.
MODEL 25 SAMPLING VALVE
CARRIER GAS
VENT
THERMAL CONDUCTIVITY CELL
DRYING TUBE
COLUMN 2
COLUMN 1
Detectors: R = reference Snsample Figure 3—Separation of a mixture contain ing cyanogen and hydrogen cyanide.
Dual Column/Dual Detector System
The complete chromatographic analysis of gaseous mixtures containing both fixed gases and hydrocarbons involves the use of both adsorption and partition-type columns. Many hydrocarbons are irreversibly adsorbed on GSC columns, whereas GLC columns do not normally yield complete resolution of the fixed-gas constituents. Consequently, the gas analysis often requires that two separate runs be made on the chromatograph with a column change in between. The patented dual-column system of the Fisher Models 25 and 2 9 Gas Partitioner™ neatly solves the problem by using an adsorption and a partition column in series, with a detector at the effluent end of each c o l u m n . One column separates the fixed gases, while the other simultaneously separates hydrocarbons. The Model 2 9 Gas Partitioner can also be used in the conventional single-column mode by flipping a switch. The unusual results shown on the accompanying chromatograms illustrate the unique separations which can be obtained. Price: Model 2 5 , $ 5 9 5 ; Model 2 9 , $ 9 7 5 . Sound interesting? Write today for our free product literature. Fisher Scientific Company, 1004 Fisher Building, Pittsburgh, Pa. 15219. F-65i
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& chemicals ST. LOUIS
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18 A
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ANALYTICAL CHEMISTRY
