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. 2022 Jul 3;11(13):1770. doi: 10.3390/plants11131770

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© 2022 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 (https://creativecommons.org/licenses/by/4.0/).

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Effect of wastewater from cigarette butts (CB) cleaning process on photosynthetic pigments of six microalgal strains. (A) Chlorophyll a (Chla), (B) chlorophyll b (Chlb), (C) total chlorophyll (Chl_total) and (D) carotenoids (Car) were determined in each microalgal strain (F1, F2, F3, F4, R1 and LG1) at the beginning of the experiment (T0) and 7 days after treatment. Microalgal treatment included exposure to growth medium without CB wastewater (Control) or containing different CB wastewater dilutions (1, 2, 5, 10 and 25%). Different letters represent significant differences (p < 0.05) between treatments within the same strain. Data are expressed as means of 4 different replicates ± standard error (SE).