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. 2016 Oct 22;16(10):1760. doi: 10.3390/s16101760

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© 2016 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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EEM-NMF fluorescence matrices of HA1 and HA4 samples: without Zn (column A) and with exemplary Zn concentrations: 5, 20 and 50 mg·dm⁻³ (columns B, C and D). For each HA: Upper plot: Component 1, lower: Component 2.