Method 508.1: Determination of Chlorinated Pesticides and Herbicides Analysis by Liquid-Solid Extraction and Electron Capture GC
EPA Method 508.1 includes many of the same components as Method 505, but it also contains several other compounds, including chlorinated pesticides, herbicides, and organohalides. In order to increase sample throughput, an optimized method is shown here using a dual column configuration with the Rtx-CLPesticides/Rtx-CLPesticides2 column pair. These columns, used under the conditions shown, offer a unique selectivity that allows the target analytes to be resolved in approximately half the analysis time of the original method. Further, both columns easily passed the comprehensive system performance criteria adapted from 508.1 (see table below). The unique selectivity of the Rtx-CLPesticides/Rtx-CLPesticides2 column pair offers an ideal balance of speed and resolution for chlorinated pesticide, herbicide, and organohalide analysis.
Rtx-CLPesticides and Rtx-CLPesticides2 columns easily pass Method 508.1 performance criteria.
|Inertness (breakdown <20%)||endrin||50||0.9%||1.4%|
|Inertness (breakdown <20%)||4,4'-DDT||100||1.0%||1.1%|
|Chromatographic performance (0.8<PGF<1.15)||DCPA||50||1.03||1.06|
|Column performance (resolution>0.50)||delta-BHC/
|Vendor||Column Pair||Analysis Time (min)||Coelutions||Restek Advantage|
|23.5 / 24||2 / 2||
|21 / 23||0 / 3|
|18 / 17||2 / 4|
|Comparison based on published competitor data. All columns tested were 0.32 mm ID.|
24-minute analysis of Method 508.1 chlorinated pesticides, herbicides, and organohalides using Rtx-CLPesticides columns and a micro-ECD. View larger
* For information regarding the nomenclature used for cis-chlordane and trans-chlordane, visit www.restek.com/chlordane-notice
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