Application Note: Increasing the Efficiency of EPA Method 549.2 using the SmartPrep Automated Cartridge Extractor
16 November 2012

Within EPA Method 549.2, the suggested rate to load a sample onto a solid phase cartridge is given as 3 to 6 mL/min. However, as advances in the chemistry of the sorbents continue to be made, it may become necessary to re-evaluate this speed. This application note from Horizon Technology outlines a process that can be used to extract diquat and paraquat from water samples using a faster loading rate than that given by the EPA in method 549.2. The resulting data from the analysis performed proves that, even though the sample load rate was increased by more than a factor of 8, the recoveries were still well within the method criteria.