Sample derivatization for this technique is the primary lab application of the silicon reagents (15[1])MSTFA and BSTFA. EPA lab procedures often use purge-and-trap to extract analytes (15[1])for this technique from an area called the “headspace.” In a compound technique frequently employed (-5[1])in forensic analysis, (15[1])a mass analyzer (15[1])replaces this technique’s (15[1])usual thermal conductivity (-5[1])or flame (15[2])(*) ionization (10[1]-5[1])detector. (10[5]-5[1])After sample (-5[2])injection, (10[1])the oven temperature in this technique is gradually ramped (-5[1])or "programmed" to space out retention times. (10[2])Helium, (-5[1])argon, (10[1])and nitrogen (10[1])are frequent mobile (10[1]-5[1])phases (10[1])or “carriers” (10[2])in this (10[2])specific (-5[3])technique, which elutes (10[2])compounds (10[2])by their boiling point. (10[2]-5[2])For 10 points, name this (-5[1])form of chromatography used to separate (10[1]-5[1])volatile compounds (10[1])in a mixture. (10[1])■END■ (10[8]0[5])