Comparison of Calibration Technique in Analysis of PFAS by Two ASTM MethodsCrafting Consensus Methods for Environmental Sampling and Measurement
Oral Presentation
Prepared by W. Lipps
Shimadzu Scientific Instruments, 7102 Riverwood Dr, Columbia, MD, 21046, United States
Contact Information: [email protected]; 14435396216
ABSTRACT
Recently ASTM Committee D19 on Water has completed an Inter-Laboratory Study for 44 PFAS in Water Method D8421. Additionally, Committee D34 on Waste Management has completed an extensive single laboratory validation for 44 PFAS in solid and biosolids by ASTM D8535. Each of these methods were written and validated using the external standard calibration technique, however, since the methods include labeled compounds as surrogates, we were able to use the surrogate data to recalculate targeted analyte results using the isotope dilution calibration technique. Additionally, for target analytes without a labeled analog, we used the same labeled compounds recommended in EPA Draft Method 1633 to apply a surrogate correction. This presentation compares actual native analyte results in highly contaminated matrices and compares target analyte recoveries in the matrices that native PFAS was low enough to spike.
