EPA Method 528 Internal Standard Back Catalog number: 93188 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 673468 Acephate, 10.0 µg/ml, Ethyl acetate, 10ml Price on request LA11457544CY Chloroparaffin C13 55.03% Cl, 10μg/mL in CY, 1ml Price on request 11156.7-10MG Perfluoroheptane sulfonic acid, potassium salt,neat,neat,10mg, Price on request