EPA Method 525.2 - 526 Internal Standard Back Catalog number: 91297 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 73686 2-Hydroxy-3-methylbutyric acid Price on request 3677.14-10MG 1-Hydroxy-9,10-anthraquinone, neat, Solvent-neat, Unit 10mg, # of units-1, Cas.no. 129-43-1 Price on request 682215 Metribuzin-desamino-diketo, 5mg Price on request