The following trace metals on filter media are designed to meet the QC requirements for Method 7300. Three concentrations (low, medium, and high) and a reagent blank are available. The filters are mixed cellulose ester type with 0.8 µm pore size and 37 mm diameter. Each set contains 10 filters and 5 blank filters. Each filter is spiked with elements, ranging in concentration from 1 to 100 µg per filter. The concentrations on each filter are certified to ± 1%. A Certificate of Analysis is provided with each set stating the exact concentrations in µg per filter. The elements and their target concentrations are as follows:

Each set of filters includes 10 spiked filters and 5 blanks