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. 2021 Mar 8;28(27):36102–36111. doi: 10.1007/s11356-021-13185-1

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Fig. 4 — Mean numbers of microplastic particles kg⁻¹ sediment along five sites of Mvudi River during (a) cool–dry, (b) hot–dry and (c) hot–wet seasons. Note differences in y–axes scaling. Mb, microbeads. The arrows represent the position of sewage treatment works