each analyte at 50 ppb in 5 mL water
VOCARB 3000 K (24940-U)
40 mL/min at 25 °C for 11 min
2 min
205 °C
210 ºC for 1 min
150 mL/min
260 °C for 10 min
110 °C
SPB-624, 20 m x 0.18 mm I.D., 1.0 μm (28662-U)
40 °C (1 min), 11 °C/min to 125 °C, 35 °C/min to 230 °C (2 min)
150 °C
220 °C
m/z = 35-400
helium, 1.5 mL/min
100:1 split
0.75 mm I.D. SPME
US EPA Method 8260 describes the analysis of volatile organic compounds in solid wastes and ground waters. This application illustrates the analysis of many compounds commonly analyzed by this method using purge and trap coupled to GC-MS. A short, narrow I.D. SPB-624 column was used to shorten the analysis time to under 11 minutes. A high desorb flow through the trap was necessary to prevent band broadening of the gaseous VOCs. This was accomplished by increasing the split ratio, thus increasing the total flow through the trap during desorb.
SPB is a registered trademark of Merck KGaA, Darmstadt, Germany