Sentence examples for polar column from inspiring English sources

Unfortunately, morphine is more polar and thus difficult to chromatograph with such a less polar column (Cole & Caddy 1995).

e Percentages are given on the apolar column except for components with identical RIa (percentages are given on the polar column), tr = trace (< 0.05%).

Two compounds, which have the same retention time on a non-polar column, might have a different retention time on the second polar column in a two-dimensional GC.

A low molecular weight polar compound might only be detectable by high retention on a polar column and might be undetectable because of lower retention on a non-polar column.

In general, for good separation of polar VOCs, a polar column is required, whereas nonpolar VOCs require a nonpolar column.

Thus, general advice for the analysis of rich mixtures of foliar VOCs is to start with a 5% phenyl-substituted (polar) column.

In principle, this separation mode can be characterized as normal-phase chromatography on polar columns in aqueous-organic mobile phases rich in organic solvents (usually acetonitrile).

Many polar columns show some contributions of reversed phase (hydrophobic) separation mechanism, depending on the composition of the mobile phase, which can be tuned to suit specific separation problems.

Compounds common to all or most AG seed samples were compared to the Wiley 7th Edition/NIST 05 mass spectral database, and identifications were confirmed by coinjection with authentic standards on both nonpolar and polar columns and by identity of unknown and standard mass spectra.

The analytes were better spread in one of the polar IL columns, IL 61, and two of the highly polar columns, IL 76 and 82.

We should note that 4-HO-BDE-90 has the same retention time as 5′-HO-BDE-99 on nonpolar GC columns (such as Rxi-5 and DB-5); however, on polar columns (such as SP-2331) twose two compounds can easily be distinguished.