Trace metal Month Viscera Shell
V August 6,82 ± 4.12 4.75 ± 1.24
  September 6.32 ± 2.12 3.54 ± 2.21
  October 5.87 ± 2.89 2.53 ± 0.78
Mn August 223.21 ± 9.03 102.43 ± 5.09
  September 117.54 ± 10.82 63.76 ± 10.33
  October 328.66 ± 30.23 200.19 ± 12.86
Fe August 1762.11 ± 43.01 527.33 ± 84.12
  September 2629.71 ± 31.93 1093.52 ± 10.88
  October 1964.76 ± 15.29 834.91 ± 16.23
Co August 5.86 ± 1.80 3.72 ± 2.02
  September 4.87 ± 1.08 2.16 ± 1.06
  October 6.81 ± 2.82 3.22 ± 1.92
Ni August 63.09 ± 9.16 34.09 ± 7.82
  September 67.45 ± 8.12 33.01 ± 4.92
  October 52.07 ± 7.89 44.83 ± 7.97
Cu August 225.21 ± 6.89 160.92 ± 12.98
  September 252.59 ± 8.12 142.09 ± 6.55
  October 399.15 ± 9.44 187.29 ± 6.02
Zn August 10.78 ± 3.01 4.99 ± 1.07
  September 9.43 ± 2.82 4.33 ± 1.26
  October 8.33 ± 2.01 3.52 ± 1.12
As August 2.15 ± 1.88 1.27 ± 0.86
  September 2.36 ± 1.09 1.26 ± 0.75
  October 1.76 ± 0.34 1.52 ± 0.91
Se August 17.63 ± 3.76 5.33 ± 1.51
  September 18.23 ± 2.10 9.33 ± 3.13
  October 17.85 ± 3.93 7.64 ± 2.81
Mo August 3.60 ± 0.21 2.03 ± 1.07
  September 2.58 ± 1.01 1.97 ± 0.84
  October 3.12 ± 0.82 2.51 ± 0.87
Ag August 2.98 ± 0.87 1.93 ± 0.66
  September 3.74 ± 0.49 1.34 ± 0.53
  October 4.52 ± 1.73 2.33 ± 0.72
Cd August 3.49 ± 0.75 2.15 ± 0.99
  September 7.41 ± 1.33 3.01 ± 0.54
  October 5.26 ± 1.54 3.73 ± 1.67
Pb August 12.09 ± 2.92 8.39 ± 1.25
  September 10.21 ± 3.98 3.09 ± 0.75
  October 13.02 ± 4.01 2.11 ± 1.03
Table 4: Mean trace metal concentration in the body tissues of Melanoides tuberculata (ppm) downstream of the effluent outfall in Alaro stream