Column Efficiency in Gas Chromatography.

Column switching analysis with packed-capillary columns in gas chromatography.

By introducing sequentially connected two packed-capillary columns, a wide range of volatile compounds were successfully separated in gas chromatography. The hyphenation of two packed-capillary columns of 1.0 mm i.d. was accomplished using a conventional 6-port valve, where the temperature of each column was individually controlled in the respective column ovens. These columns were prepared w...

Selectivity tuning in chiral dual column gas chromatography.

The enantioselective tuning of two columns coupled in series is investigated in chiral high-resolution gas chromatography. Two columns with opposite enantioselectivities (Chirasil-L-Val and Chirasil-D-Val) are coupled in series via a T connector, and the relative retention of enantiomers chromatographed on the system is changed by varying the individual carrier gas flow rates in the coupled col...

Capillary Column Selectivity and Inertness for Sulfur Gas Analysis in Light Hydrocarbon Streams by Gas Chromatography

Phosphorus assay in column chromatography.

Malerials-30 per cent hydrogen peroxide (Baker and Adamson, phosphorus-free) and the ammonium molybdate, (NHJ6lMo7024.4Hz0, wereused. The Fiske and SubbaRow (I) reagent was prepared by adding 0.5 gm. of purified (1) 1-amino-2naphthol-4-sulfonic acid (Eastman Organic Chemicals) with mechanical stirring to 200 ml. of freshly prepared 15 per cent sodium bisulfite (anhydrous), followed by 1.0 gm. o...

Gas Chromatography I. Retention, Efficiency and Resolution Purpose

Purpose In this experiment you will examine the effect of temperature on retention in isothermal gas chromatography, and use this information to determine the heat of solution of the solute in the stationary phase and to determine the temperature for optimum retention. You will also examine the effect of flow rate on efficiency and construct a van Deemter plot, and determine the flow rate for o...