A new electron capture detector (ECD) for the Agilent 6890 Series gas chromatograph (GC) was used to ana- lyze polychlorinated biphenyl congeners and organochlorine pesticides. The linearity of the 6890 Micro-ECD in the calibration range of 2 to 400 ppb was evaluated. The micro-ECD easily meets the linearity requirements of U.S. EPA contract laboratory programs for pesti- cides. Its limit of detection for these compounds goes down to less than 50 ppt. The micro-ECD also exhibits good reproducibility.
The document describes a new electron capture detector (ECD) developed for the Agilent 6890 Series gas chromatograph. This Micro-ECD features a smaller flow cell optimized for capillary columns, addressing limitations of traditional ECDs regarding linearity and sensitivity with small-bore columns.
The detector is linear for PCB congeners from 2 to 200 ppb and for organochlorine pesticides from 2 to 400 ppb.
The limit of detection for these compounds goes down to less than 50 ppt.
The CLP method requires the percent RSD of the response factors to be less than 20 percent.