Gls -2m x 3mm ID siliceous earth gas chromatography 150 to 180um with diethylene glycol adipate ester for gas chromatography and phosphoric acid at the ratio of 5% and 1% respectively.
Gls -2m x 3mm ID siliceous earth gas chromatography 150 to 180um with diethylene glycol adipate ester for gas chromatography and phosphoric acid at the ratio of 5% and 1% respectively.