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. 2016 Mar 31;10:14. doi: 10.1186/s13065-016-0160-5

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© Woźniczka et al. 2016

Open AccessThis 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. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 9 — Distribution diagram of complex species versus pH for a solution of: a Co[(imid)₂]_n and histidine in molar ratio 1:5. C _Co = 0.01 mol L⁻¹. L–histidine (HisH_-1), L′–imidazole (Himid); b Co(NO₃)₂ and histidine in molar ratio 1:5. C _Co = 0.04 mol L⁻¹. L–histidine (His⁻)