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. 2016 Oct 26;24(2):1553–1564. doi: 10.1007/s11356-016-7932-2

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© The Author(s) 2016

Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 2 — Dissolution kinetics for ZnO nanomaterials and bulk analogues at a low pH and b neutral pH. a Mass fractions of the dissolved/original material (M _d/M _o) fitted using Eq. 1 (see text). b Mass fractions of the remaining/original material (M _r/M _o) fitted using Eq. 2 (Eq. 2a for bulk-ZnO as described in text). Error bars represent standard deviations of three individual replicates