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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