Internal Standard Solution, 1.2ml, nonane Back Catalog number: EPA-23IS Manufacturer: Wellington Laboratories Availability: 1 week Price on request - + Recommended C12721000 3,3´-Dimethoxybenzidine, certified, 0.1g Price on request 93600 EPA Method 502.2/624Mix Price on request 9497.13-100-ME Propyphenazone, 100µg/mL, Solvent-methanol, Unit 1mL, # of units-1, Cas.no. 479-92-5 Price on request