EPA Method 524 & 624 - Internal Standard Back Catalog number: 19494 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended D454655-1MG 3,4-Dihydroxyphenylglycolaldehyde (Dopegal), 1mg Price on request 679339 Valsartan, 10mg Price on request 14800-0075-50ME5 7H-Perfluoroheptanoic acid, 50µg/ml in MeOH, 5ml Price on request