One 2 mL flame-sealed ampule yields in excess of 1.5 L after dilution. The diluted standard is certified for 32 analytes spiked at 10-200 ng/L . The sample is designed for LC/MS/MS methods for analyzing potable water, specifically EPA Methods 533, 537 and 537.1. PFOS, PFHxS, NEtFOSAA and NMeFOSAA are made using standards which include both branched and linear isomers. The assigned value presented on the Certificate of Analysis for these compounds is the total isomer concentration. This product is a replacement for PFAS Drinking Water and PFAS Ground Water and Surface Water: 960 (PT), 735 (CRM), 735QR (QR), 929 (PT), 731 (CRM) and 731QR (QR).