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. 2022 Jul 29;848:157707. doi: 10.1016/j.scitotenv.2022.157707

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Fig. 7 — Concentration of SARS-CoV-2 experimentally determined (C_CoV) at AR-2 in Arenales River and the normalized concentration using three different alternatives: (a) alternative 1 (CN1_CoV), using the concentration of human polyomavirus (HPyV), according to Eq. (1), (b) alternative 2 (CN2_CoV), using the concentration of RNase P, according to Eq. (2), and (c) alternative 3 (CN3_CoV), using the concentration of HPyV and RNase P, according to Eq. (3).