TPH Internal Standard Back Catalog number: 92636 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 2453.7-K-IP 2,6-Dinitroanisole, 1000µg/mL, Solvent-isopropanol, Unit 1mL, # of units-1, Cas.no. 3535-67-9 Price on request 680160 2-Methyl-1-propanol, 1ml Price on request 675984 Diquat and Paraquat Mix 1, 1000 µg/ml, Water, 1m Price on request