Method 8151A: Chlorinated Herbicides Analysis by GC Using Methylation or Pentafluorobenzylation Derivatization
Today, many modern herbicides are designed to selectively kill specific types of vegetation. Even though these herbicides are not environmentally persistent and degrade in less than one year, EPA Method 8151A was developed for chlorinated herbicide analysis in wastewater and soil matrices. The most commonly used compounds targeted in this method are the chlorophenoxy herbicides. Of these herbicides, (2,4-dicholorophenoxy)acetic acid, also known as 2,4-D, is the most widely used and widely monitored herbicide worldwide.
According to Method 8151A, samples containing the target herbicides are analyzed using a parallel dual-column confirmation setup and an ECD, the recommended method of detection. Because of this, many laboratories acquire chlorinated herbicides on the same instrument setup used for chlorinated pesticide and PCB analyses. The Rtx-CLPesticides and Rtx-CLPesticides2 column pair also performs exceptionally well for chlorinated herbicide analysis; in fact, all 17 target compounds in EPA Method 8151A can be determined in just 13 minutes using these columns. One pair of compounds (bentazon and picloram methyl esters) coelutes on the Rtx-CLPesticides column, but these compounds are fully resolved on the Rtx-CLPesticides2 column. And, due to the difference in selectivity of the columns, several elution order changes occur filling the confirmational requirement of the method.
|Vendor||Column Pair||Analysis Time (min)||Coelutions||Restek Advantage|
|13 / 13||1 / 0||
|13 / 13||0 / 0|
|16 / 15||1 / 1|
|Comparison based on published competitor data. All columns tested were 0.32 mm ID.|
Excellent resolution of chlorinated herbicides on the Rtx-CLPesticides/
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