USEPA method 608 is GC-ECD method to determine Aroclor and organochlorine pesticides. This method requires the use of second column for confirming the detected compounds due to the low selectivity of the ECD detector comparing with GC-MS/MS. Also pattern recognition is required for accurate identification of Aroclors. Triple quadrupole GC-MS/MS based method offers a solution for the GC-ECD method's drawbacks by providing high selective analysis. In addition, the type and concentration of Aroclor can be simultaneously determined.