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Table 1 Concentrations of Cu and Zn in the benthic sediment and two dominant gastropod species of River Osun and their accumulation factors

From: Assessment of two persistent bioaccumulative toxicants in the UNESCO protected river of Osun-Osogbo, Nigeria

Period Sediment (n = 10) M. tuberculata (n = 10) L. varicus (n = 10)
  Mean ± s.e. (μg/g) of Cu Contamination factor Mean ± s.e. (μg/g) of Cu Accumulation factor Mean ± s.e. (μg/g) of Cu Accumulation factor
June 2015 1.16 ± 0.25 0.02 2.07 ± 0.37 1.79 3.11 ± 0.45 2.68
September 2015 2.41 ± 0.76 0.05 2.11 ± 0.68 0.88 1.87 ± 0.55 0.78
December 2015 1.36 ± 0.31 0.03 2.98 ± 0.34 2.19 2.67 ± 0.38 1.96
March 2016 1.21 ± 0.77 0.02 2.13 ± 0.40 1.76 2.32 ± 0.31 1.92
  Mean ± s.e. (μg/g) of Zn Contamination factor Mean ± s.e. (μg/g) of Zn Accumulation factor Mean ± s.e. (μg/g) of Zn Accumulation factor
June 2015 6.05 ± 0.96 0.09 8.11 ± 1.35 1.34 9.09 ± 1.37 1.50
September 2015 8.96 ± 1.37 0.13 5.51 ± 0.89 0.61 9.4 ± 1.41 1.05
December 2015 6.96 ± 1.03 0.10 6.84 ± 0.83 0.98 12.51 ± 0.44 1.79
March 2016 3.17 ± 1.11 0.05 4.57 ± 0.81 1.44 10.56 ± 1.34 3.33