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All standards are prepared from high-purity starting materials, sub-boiling distilled acids and 18-megaohm de-ionized water. We use only class A volumetric glassware calibrated by NIST guidelines. Starting materials are weighed to 0.1-mg on analytical balances calibrated by NIST traceable Class F weights. The acids and de-ionized water are regularly tested by ICP-MS to ensure purity.
Each standard is packaged in an HDPE Passport IP2 bottle pre-leached and secured with a heat-shrink seal.
Every standard is certified gravimetrically and instrumentally against NIST SRM 3100 Series spectrometric solutions. A Certificate of Analysis reporting ICP-MS analysis for trace impurities and a Material Safety Data Sheet are shipped with every standard. CPI guarantees the accuracy of single-elements to ± 0.3% for 18 months from date of shipping.
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