EPA Method 502.2 Surrogate Standard Back Catalog number: 91704 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended TCDT-85 2,4,6,8-Tetrachlorodibenzothiophene, 1.2ml x 50ug/ml, toluene Price on request 96560 Imipramine Price on request 59104 Sulphate (SO42-) Price on request