Each Single Element Calibration Standard for AA and ICP-OES is supplied with a comprehensive Certificate of Analysis that documents the quality and reliability.
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Concentration of Elements includes:
Potassium (K) Pure Plus Standard, 1,000 µg/mL, 2% HNO3, 125 mL
Potassium (K) Pure Standard, 1,000 µg/mL, 2% HNO3, 500 mL