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This document specifies a method for determination of mercury in aqua regia digests of soil improvers and growing media, prepared according to prEN 13650:2025, using (cold) vapour generation apparatus coupled to an atomic absorption spectrophotometer or thermal decomposition, amalgamation and atomic absorption spectrophotometry. With the latter technique, direct analysis is also suitable for solid samples.
NOTE 1 It is also possible to use other suitable methods for the determination of mercury described in Annex A if users prove that the method gives the same results as the methods described in this document.
NOTE 2 In unique circumstances where mercury is bound in silicates or other matrices (e.g. phosphates) that do not thermally decompose, it is essential to validate direct analysis of the solid using the aqua regia digestion according to prEN 13650:2025, followed by analysis with this method (see Clause 5.2).
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