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View Actual EPA Method 6800 (PDF File)
EPA Method 6800:ELEMENTAL AND SPECIATED ISOTOPE DILUTION MASS SPECTROMETRY
Summary:Samples may require a variety of sample preparation procedures, depending on sample matrices and the isotope ratio measurement methods. One primary purpose of sample preparation is to solubilize the analyte of interest and equilibrate the spike isotopes with sample isotopes. Solids, slurries, and suspended material must be subjected to digestion after spiking using appropriate sample preparation methods.
Scope:This method consists of two approaches: (1) isotope dilution mass spectrometry (IDMS) for the determination of total metals, elements and (2) speciated isotope dilution mass spectrometry (SIDMS) for the determination of elemental and molecular species. This method is applicable to the determination of total metals, metal species and molecular species at ?g/g and sub ?g/L levels in water samples, solid samples or in extracts or digests. In general, elements and molecules that have more than one available stable isotope can be analyzed by IDMS. SIDMS may require more isotopes of an element or molecule, depending on the number of interconvertible species.
Report Number:SW-846 Ch 3.3