Laboratory method using Hydrar® diffusive badges or pumped sorbent tubes, acid dissolution and analysis by cold vapour atomic absorption spectrometry or cold vapour atomic fluorescence spectrometry

Note 1: This method updates and replaces MDHS 16.1 The principal changes which have been made are (i) to expand the scope of the method to include the determination of mercury vapour and divalent mercury compounds, rather than mercury vapour only; (ii) to refer to the use of Hydrar as sorbent, since this has now replaced hopcalite; (iii) to describe a diffusive sampling method for mercury vapour, as an alternative to pumped sampling; (iv) to describe the use of flow injection, discrete injection and continuous flow cold vapour systems, rather
than the batch cold vapour technique previously described, which has now been largely superseded; and (v) to describe the use of atomic fluorescence
spectrometry for analysis of sample solutions, as an alternative to atomic absorption spectrometry.

Note 2: The revised MDHS has been developed in
parallel with ISO 17733.2