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Inorganic mercury and methyl mercury contents by species\u2010specific isotope dilution inductively coupled plasma mass spectrometry with on\u2010line high\u2010performance liquid chromatography or with classical off\u2010line chromatography were established. Different extraction protocols: sequential extraction ((1) H<jats:sub>2<\/jats:sub>SO<jats:sub>4<\/jats:sub>\/KBr\/CuSO<jats:sub>4<\/jats:sub>; (2) dichloromethane; (3) Na<jats:sub>2<\/jats:sub>S<jats:sub>2<\/jats:sub>O<jats:sub>3<\/jats:sub>) or one\u2010step extraction (diluted HCl) in solid\u2010liquid systems were verified. Sequential extraction allowed quantification and separation of inorganic mercury and methyl mercury on HPLC column in one chromatographic run and were found to be (316 \u00b1 10) \u03bcg\/kg (<jats:italic>U<\/jats:italic> = 3.2%, <jats:italic>k<\/jats:italic> = 2) and (0.53 \u00b1 0.02) \u03bcg\/kg (<jats:italic>U<\/jats:italic> = 3.8%, <jats:italic>k<\/jats:italic> = 2), respectively. Extraction by diluted HCl and application of classical off\u2010line chromatography led to the separation of methyl mercury from predominant inorganic mercury form and was found to be (0.54 \u00b1 0.03) \u03bcg\/kg (<jats:italic>U<\/jats:italic> = 5.4%, <jats:italic>k<\/jats:italic> = 2). To the best\u2010obtained literature knowledge, there was no available soil material aimed for speciation analysis of inorganic mercury and methyl mercury so far. Both developed analytical methodologies were found to be equally sensitive and could be successfully applied for mercury species determination in samples with the complex matrix.<\/jats:p>","DOI":"10.1002\/jssc.202200347","type":"journal-article","created":{"date-parts":[[2022,7,12]],"date-time":"2022-07-12T03:10:20Z","timestamp":1657595420000},"page":"3624-3634","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Assignation of inorganic mercury and methylmercury mass fractions in a soil matrix certified reference material by two analytical methodologies based on species\u2010specific isotope dilution mass spectrometry and chromatographic separation"],"prefix":"10.1002","volume":"45","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9824-3219","authenticated-orcid":false,"given":"Agnieszka Anna","family":"Krata","sequence":"first","affiliation":[{"name":"Faculty of Chemistry University of Warsaw  1 Pasteura St. 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