A modulator is used between the two columns to take a cut from the first column and reinject in a narrow sample band onto the second column. A molecule which has one or more polar covalent bonds may have a dipole moment as a result of the accumulated bond dipoles.
Molecular Structure And Polarity Chemistry For Majors
The normal set-up is a 1 st dimension non-polar column followed by a 2 nd dimension more polar column as shown in Figure 3 for the analysis of diesel.
. In the case of water we know that the O-H covalent bond is polar due to the different electronegativities of hydrogen and oxygen.
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