Megabore capillary columns are the most common columns used in environmental analysis. Some of the common capillary columns used for SVOC analysis include: From J&W Scientific: DB-608, DB-1701, DB-5, DB-1, DB-Dioxin, DB- TPH, and dual column DB-17/1701P From Hewlett Packard: HP-5, HP-1, HP-35, HP-1701, HP-608, and HP- 1301 From Restek: RtX®-50, RtX®-35, dual column RtX®-1701/MXT®-1701, and RtX®-2330 (for dioxin), RtX®-5/MXT®-5 dual column Some of the common capillary columns used for VOC analysis include: From J&W Scientific: DB-624, DB-VRX, DB-5022, and dual column DB-624/VRX From Hewlett Packard: HP-VOC and HP-624 From Restek: RtX-502.2, RtX®-624, and dual column RtX®-624/ MXT®-624 An example of a stainless steel column is RtX®-5, which is an unbreakable fused silica- lined stainless steel column. The column withstands higher temperatures and is used for analyzing for alcohols, ketones, and VOCs by purge-and-trap.