is Principal Scientist and Team Lead er of the Inorganic Analysis team within the Science and Innovation Division at LGC. Her key expertise lies in trace element speciation analysis, metallomics research, combi ned use of elemental and molecular mass spectrometry, size-based element fractionation and the characterisation of “speciated” reference materials. Heidi is the UK representative at the Inorganic Analysis Working Group of the international Consultative Committee for Metrology in Chemistry (CCQM). She is the leading author of over 70 scientific peer reviewed scientific papers.