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. 2021 Jun 24;28(43):60968–60980. doi: 10.1007/s11356-021-14696-7

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© The Author(s) 2021

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Fig. 2 — Nitrification profiles of cultures in presence of CF at different concentrations: a NH₄⁺-N and b NOx-N (NO₂⁻ +NO₃⁻). Data points show average concentration ± maximum and minimum values