EPA Method 528 Internal Standard Back Catalog number: 93188 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 79243 2,4’-Dinitrodiphenylamine Price on request 11882.9-100G Di-n-butyl-carbonate,neat,neat,100g, Price on request S-4256-1-10LW Sulfur Calibr. Mix. Dibenzothiophene in White oil (20 cSt)Unit: 10mL screw-capped bottle Matrix White oil White Oil Concentration Isooctane Toluene 3 cSt Price on request