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. 2018 Apr 2;23(4):808. doi: 10.3390/molecules23040808

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© 2018 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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²⁷Al NMR of Al₂(SO₄)₃ with a concentration of 50.0 g/L at pH 4 recorded at the same conditions for the different media L1–4 and water. The three signals at 5.2 ppm for the dimer, at 0.9 ppm for the aluminium hexahydrate cation and at −2.4 ppm for the [Al(H₂O)₅SO₄]⁺, are scaled relative to the most intense resonance at 0.9 ppm.