The National Physical Laboratory (NPL) is seeking engagement from suppliers who can provide inductively coupled plasma mass spectrometer with collision reaction cell technology for analysis of trace elements primarily in environmental samples. The instrument should have capability for resolving isobaric interferences via collision/reaction cell with four-channel cell gas control for a range of collision and reaction cell gases and two mass filter quadrupoles, both of which allow for ± 1 amu ion selection control pre- and post-cell. There should be capability for single particle ICP-MS for nanoparticle characterization and high matrix introduction for up to 25% total dissolved solids.