Piperonyl Butoxide Issue
Posted: Tue Nov 08, 2011 9:50 pm
I currently and working to develop a method for pesticide quantitiation of in-house formulations as a QC check. I am using an Agilent HP-5 30m x 0.32mm x0.25 um. The method I am writing analyzes for Tetramethrin, Permethrin, Sumitherin and Piperonyl Butoxide. I get accurate, reproducable results when analyzing both raw materials and individual batches for Tetramethrin, Permethrin and Sumithrin, but I am getting between 92% and 95% recovery for Piperonyl Butoxide, only in raw material and batch samples. I have made several method check standards from two different standard suppliers, and when I run the check standards, they are +/- 1% of the theoretical. There is no obvious interference that I can see. If it was my column or GC, the check standards would show the same low recovery, correct?
Has anyone had experience with this?
Has anyone had experience with this?