EPA Method 528 Internal Standard Back Catalog number: 93188 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 1685.10-K-IO 2-n-Hexylthiophene, 1000µg/mL, Solvent-isooctane, Unit 1mL, # of units-1, Cas.no. 18794-77-9 Price on request 9508.7-100-AN DNOC-d3, 100µg/mL, Solvent-acetonitrile, Unit 1mL, # of units-1, Cas.no. 1219804-69-9 Price on request 73445 Oxybenzone Price on request