Gls -1.8m x 4mm ID siliceous earth gas chromatography 175 to 246um with diethylene glycol adipate ester for gas chromatography and phosphoric acid at the ratio of 25%
Gls -1.8m x 4mm ID siliceous earth gas chromatography 175 to 246um with diethylene glycol adipate ester for gas chromatography and phosphoric acid at the ratio of 25%