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Many precautions are usually needed to avoid biological or physical degradation, including filtration, acidification, and sterilization. In this study, the drawbacks associated with liquid-based seawater CRMs were tackled by developing a salt-based seawater proxy for nutrients that could be reconstituted in water solution just before use. Phosphate, silicate, and nitrate were chosen as target analytes. Sea salt mimicking the composition of seawater was spiked with an aqueous solution of the analytes and homogenized using a high-energy planetary ball mill (<jats:italic>u<\/jats:italic><jats:sub>hom<\/jats:sub>\u2009&lt;\u20091.2%). The salt powder CRM SALT-1 (<jats:ext-link xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" ext-link-type=\"uri\" xlink:href=\"https:\/\/doi.org\/10.4224\/crm.2022.salt-1\">https:\/\/doi.org\/10.4224\/crm.2022.salt-1<\/jats:ext-link>) demonstrated good short- and long-term stability for nutrients. When the SALT-1 was reconstituted in water at the 4.0% <jats:italic>w<\/jats:italic>\/<jats:italic>w<\/jats:italic> level, the resulting solution had similar properties with respect to typical seawater in terms of major constituents (\u00b1\u200920%), trace metals, density (1.023\u00a0g\/mL), pH (8.8\u20139.0), and optical properties relevant to the photometric characterization. Phosphate and silicate were quantified by photometry (molybdenum blue method, batch mode), whereas nitrate was quantified by isotope dilution GC\u2212MS (<jats:italic>u<\/jats:italic><jats:sub>char<\/jats:sub>\u2009&lt;\u20091.2%). In the SALT-1 reconstituted seawater solution at the 4.0% <jats:italic>w<\/jats:italic>\/<jats:italic>w<\/jats:italic> salt level, the nutrient amount concentration was <jats:italic>w<\/jats:italic>(phosphate, PO<jats:sub>4<\/jats:sub><jats:sup>3\u2212<\/jats:sup>)\u2009=\u20091.615\u2009\u00b1\u20090.030\u00a0\u03bcmol\/L, <jats:italic>w<\/jats:italic>(silicate as SiO<jats:sub>2<\/jats:sub>)\u2009=\u20098.89\u2009\u00b1\u20090.31\u00a0\u03bcmol\/L, and <jats:italic>w<\/jats:italic>(nitrate, NO<jats:sub>3<\/jats:sub><jats:sup>\u2212<\/jats:sup>)\u2009=\u200918.98\u2009\u00b1\u20090.45\u00a0\u03bcmol\/L at the 95% confidence (<jats:italic>k<\/jats:italic>\u2009=\u20092). Overall, the SALT-1 CRM exhibits similar nutrient profile and general analytical characteristics as the MOOS-3 CRM. However, the SALT-1 has much reduced preparation, storage, and distribution cost, likely much better long-term stability, and it could enable the production of lower cost and more accessible seawater reference materials.<\/jats:p>\n                <jats:p><jats:bold>Graphical abstract<\/jats:bold><\/jats:p>","DOI":"10.1007\/s00216-022-04098-0","type":"journal-article","created":{"date-parts":[[2022,5,11]],"date-time":"2022-05-11T23:03:45Z","timestamp":1652310225000},"page":"4745-4756","update-policy":"http:\/\/dx.doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["From sea salt to seawater: a novel approach for the production of water CRMs\ufeff"],"prefix":"10.1007","volume":"414","author":[{"given":"Enea","family":"Pagliano","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kenny","family":"Nadeau","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ovidiu","family":"Mihai","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Indumathi","family":"Pihillagawa Gedara","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Zolt\u00e1n","family":"Mester","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2022,5,12]]},"reference":[{"issue":"11","key":"4098_CR1","doi-asserted-by":"publisher","first-page":"2941","DOI":"10.1007\/s00216-015-8500-1","volume":"407","author":"SA Wise","year":"2015","unstructured":"Wise SA, Emons H. 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