Multi-Element QC-21 Check Standard Solution is used as a certified reference material or quality control check standard for inductively coupled plasma optical emission spectroscopy (ICP-OES). It is also used in inductively coupled plasma mass spectrometry (ICP-MS), and flame or furnace atomic absorption spectroscopy.

This Thermo Scientific Chemicals brand product was originally part of the Alfa Aesar product portfolio. Some documentation and label information may refer to the legacy brand. The original Alfa Aesar product / item code or SKU reference has not changed as a part of the brand transition to Thermo Scientific Chemicals.