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two columns
The tetra-n-butylammonium cations were stacked to give two columns within each channel with cross-sectional size of about 2.30 nm × 0.93 nm.
      
A combination of two columns in series, using two new stationary phases, for the separation of individual lower hydrocarbons in a mixture has been described.
      
He, CO, CO2 and CH4 were separated on the two columns in series while water is eluted from the first column by a suitable commutation of the two columns through a diaphragm valve.
      
The analysis mixtures, including gasoline and air samples, are transferred onto two columns with phases of different polarity.
      
Two columns in parallel are used for the separation of C1-C10 hydrocarbons: a SCOT column coated with Apiezon L and a packed column containing 2 m Durapak (phenylisocyanate/Porasil C) and 3 m 25% squalane on Gas Chrom P.
      
Gas chromatographic retention indices of pyrolysis products of styrene-acrylonitrile and styrene-methylacrylate copolymers were measured on two columns prepared with different stationary phases.
      
These include trace analysis by preconcentration and by direct analysis and the utilization of multidimensional gas chromatography with two columns, two detectors, a 12-port valve, and a catalytic conversion reactor.
      
This involves a single chromatography fitted with two columns, a porous-layer open-tubular column coated with KCl deactivated alumina and a packed Porapak-Q column.
      
Our aim was to evaluate the specificity, sensitivity and reproducibility of plasma and urinary catecholamine assay by these two columns.
      
The system uses two columns (CN and C18) arranged in series, via a valve which allows the effluent to be switched from the primary column to the secondary column or directly to the detector.
      
It is possible to differentiate between the two columns with the pair ethylbenzoate and toluene.
      
The sample was chromatographed on two columns, SB-biphenyl-30 (70% methyl-30% biphenylpolysiloxane) and SB-cyanopropyl-50 (50% methyl-50% cyanopropylsiloxane).
      
Experimental retention factors, acquired in coupled column systems with two columns connected in different order, were thus compared with values calculated from runs on each single column.
      
The components of this essential oil were identified by the retention times obtained on two columns differing in polarity and by GC-MS.
      
Semi-preparative separation of Kava lactones was also obtained using two columns connected in series.
      
The resolution obtained on the two columns was complementary.
      
Two columns with opposite polarity, SPB-1 and HP-FFAP, were used and the relative retention time was the qualitative parameter in the knowledge base.
      
Two columns of different length were used, and the influence of the volume percentage of isopropyl alcohol in the mobile phase was studied.
      
Quantitative Prediction of Normal Boiling Points for Organic Compounds Using Gas Chromatographic Retention Times on Two Columns
      
GC, with two columns connected to two electron capture detectors (ECD), was used.
      
 

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