Quality Control Standards are used to check the standard curve, the procedure for inter-element correction and other spectral interferences. These standards are carried through the entire analytical operation of the method. If the determined concentration is not within ±5% of 1 µg/mL, the laboratory performance is unacceptable. The source of the problem should be identified and corrected before continuing the analysis.

Standards may be diluted in the same matrix as specified; however, caution must be exercised in the choice of the source for your diluents. Diluting the matrix may cause some standards to precipitate. Also, an impure or unknown diluent turns your standard into an unknown. We recommend using only SPEX CertiPrep Matrix Blanks when diluting your standards.

Chemicals sold by Cole-Parmer are not intended for and should not be (i) used for medical, surgical or other patient oriented applications, or (ii) combined with any food product or ingested in any form.

This multi-element standard set contains 2 solutions.

• Solution 1 (QC standard 21) is a 125 mL bottle which contains 100 µg/mL (100 ppm) Antimony, Arsenic, Beryllium, Cadmium, Calcium, Chromium, Cobalt, Copper, Iron, Lead, Lithium, Magnesium, Manganese, Molybdenum, Nickel, Selenium, Strontium, Thallium, Titanium, Vanadium, Zinc in 5% HNO3/tr. Tartaric Acid/tr. HF. This is available individually as part number 04568-00.

• Solution 2 (QC standard 7A) is a 125 mL bottle which contains 1,000 µg/mL (1,000 ppm) Potassium; 500 µg/mL (500 ppm) Silicon; 100 µg/mL (100 ppm) Aluminum, Barium, Boron, Sodium; and 50 µg/mL (50 ppm) Silver in 5% HNO3/tr. HF. 5% HNO3/tr. This is available individually as part number 04567-98.

Hazardous material shipping fees may apply.