Rtx-440&Rtx-PCBColumns: Two
NewLowBleedColumnswith
UniqueSelectivity (figures 3a&3b).
This column pair allows the accurate determination of organochlorine pesticides or
polychlorinated biphenyls (PCBs). TheRtx-PCB column iswell suited for congener-specific
analysiswhere greater PCB information is necessary versus themore commonly
performedArochlor test. The analysis of the 20 chlorinatedpesticides is shown in less than
12minutes but separation is the least optimal of the choices presented in this paper. This
column pair can produce 80% resolution for EPAMethod 8080with a longer runtime (20
minutes). The selectivity between these columns is unique; thereare two column pair
changes: heptachlor/d-BHC (peaks 5/6) & 4,4’-DDT/endrin aldehyde (peaks 17/18). These
two columns also have excellent bleed characteristicsminimizingdetector contamination,
prolonging intervals between cleanings and thus increasing throughput over time.
