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Table 2 Bioaccumulation factors of heavy metals Achatina achatina, Achatina marginata and Achatina fulica

From: Proximate composition and bioaccumulation of heavy metals in edible Achatina spp in some rural agro-settlements, south-east Nigeria

Metal (ppm) Achatina achatina Achatina marginate Achatina fulica Standard*
Pb
 Mean ± SD 0.0007 ± 0.003 0.003 ± 0.005 0.0002 ± 0.005 0.01
 Median (IQR) 0 (0) 0 (0.003) 0 (0)  
Cd
 Mean ± SD 0.001 ± 0.002 0.0003 ± 0.0006 0.002 ± 0.001 0.03
 Median (IQR) 0.001 (0.002) 0.00 (0) 0.002 (0.002)  
Hg
 Mean ± SD 0.002 ± 0.007 0.026 ± 0.014 0.032 ± 0.016  
 Median (IQR) 0.022 (0.010) 0.024 (0.020) 0.034 (0.010)  
Zn
 Mean ± SD 0.006 ± 0.006 0.002 ± 0.003 0.008 ± 0.006 3.00
 Median (IQR) 0.003 (0.010) 0 (0.001) 0.010 (0.010)  
Ni
 Mean ± SD 0.014 ± 0.013 0.016 ± 0.020 0.009 ± 0.008  
 Median (IQR) 0.01 (0.019) 0.01 (0.025) 0.01 (0.015)  
Mg
 Mean ± SD 0.075 ± 0.061 0.112 ± 0.058 0.097 ± 0.062 20.0
 Median (IQR) 0.10 (0.09) 0.13 (0.07) 0.12 (0.11)  
Mn
 Mean ± SD 0.0001 ± 0.0004 0.0004 ± 0.0006 0.0001 ± 0.0004 0.20
 Median (IQR) 0 (0) 0 (0.001) 0 (0)  
Cu
 Mean ± SD 0.01 ± 0.009 0.013 ± 0.009 0.015 ± 0.012 2.00
 Median (IQR) 0.01 (0.01) 0.01 (0.01) 0.01 (0.02)  
  1. *WHO recommended standard