EPA Method 548.1 Internal Standard Back Catalog number: 30078 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 680174 Phenylparaben, 25mg Price on request 70718 Isoprocarb Price on request 12123.K-IP 2,4,5-Trichloroanisol,1000 µg/mL,isopropanol,1mL, Price on request