Name: METHOD 1613 INTERNAL STANDARD SPIKING SOLUTION Isotope :(13C12, 99%) Catalog Number :EDF-5999 Quantity :0.5 ML Formula :no formula is available. Categories :Dioxin & Furan Mixtures (DFM), US EPA Method Mixtures (E) 1,2,3,4-TetraCDD(13C12,99%).20