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Table 3 Geochemical background and threshold values (µg/kg) of stream sediments from the lower Lom Basin alongside local soil and Sub-Saharan ferralsols

From: Regional geochemical baseline concentration of potentially toxic trace metals in the mineralized Lom Basin, East Cameroon: a tool for contamination assessment

  Sc V Cr Mn (mg/kg) Fe (mg/kg) Co Ni Cu Zn As Se Cd Hg Pb
This study, background 128.3 85.9 39.1 319.0 22,627.4 0.5 15.7 211.1 314.3 22.1 15.3 2.5 2.3 47.5
This study, mean 105.4 201.4 156.1 406.1 25,899.3 12.3 58.4 174.8 248.7 24.1 19.7 2.4 2.9 56.5
Threshold values 132.4 96.0 41.4 330.7 36,692.6 0.7 15.8 211.2 354.3 61.2 34.4 7.4 39.0 142.6
Local soil (ppm) 1 4 0.05 1 5
Ferralsols (mg/kg) 30 53 578 34,957 21 21 41 36
Percentage (%) sediment samples exceeding ferrasols 0 0 18.18 18.18 0 0 0 0
  1. Geochemical background: median; Geochemical background threshold: median + 2 (median absolute deviation); metal concentrations in local soil are adapted from Manga et al. [49] while data for ferralsols are after Towett et al. [75]