Topics in GC & HPLC

Of Restek’s seven variations of PEG phases the top sellers are the Stabilwax & Rtx-Wax columns. While the Stabilwax phase has the advantage of low bleed and stability; the ability of the Rtx-Wax to operate at below 40°C is especially advantageous for the analysis of low molecular weight volatiles. This is true for concentration techniques involving HS or P&T analytes which must be cold trapped onto the head of the column from the gas phase. Many PEG phases (including Stabilwax) undergo a solid-liquid phase transition T(g) below 40°C that results in loss of capacity and poor retention time reproducibility. Unfortunately the example shown here is my personal mis-use of the Stabilwax Phase–so unless you want to add to my blog choose the right PEG for your specific analysis and don’t hesitate to ask us for help.