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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 3 recorded at identical conditions for media L1–4 and water. The three signals at 5.2 ppm for the dimer, at 0.9 ppm for the aluminium hexahydrate and at −2.4 ppm for the [Al(H₂O)₅SO₄]⁺, are scaled relative to the most intense resonance at 0.9 ppm.