TM19-01 Characterization of bias and variability in dissolved trace elements determined by inductively coupled plasma–mass spectrometry (ICP-MS) attributable to a deviation in the acid concentration of calibration standards

This technical memorandum alerts data users to potential shifts in measured concentration and variability due to the correction of a deviation in the standard operating procedure (SOP) used in the determination of trace elements in filtered acidified water (FA) by inductively coupled–plasma mass spectrometry (ICPMS). The SOP deviation occurred from an unknown start date of no earlier than October 2005 (possibly as late as 2008) and ending August 8, 2015. The deviation was a change in the concentration of acid used

in calibration standards, which could affect concentrations measured in environmental samples.