EPA Method 632 Spike Standard Back Catalog number: 93970 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 70027 Benzidine Price on request 11902.19-K-ME Protriptyline hydrochloride ,1000 µg base/mL,MeOH,1mL, Price on request PCB-IS-A100 Mass-Labelled PCB Solution, 1.2ml x 100ng/ml, nonane Price on request