Sample derivatization for this technique is the primary lab application of the silicon reagents MSTFA and BSTFA. EPA lab procedures often use purge-and-trap to extract analytes for this technique from an area called the “headspace.” In a compound technique frequently employed in forensic analysis, a mass analyzer (15[1])replaces this technique’s usual thermal conductivity or flame (*) ionization detector. After sample injection, the oven temperature in this technique is gradually ramped or "programmed" to space out retention times. Helium, argon, and nitrogen are frequent mobile phases or “carriers” in this specific technique, which elutes compounds by their boiling point. For 10 points, name this form of chromatography used to separate volatile compounds in a mixture. ■END■