International Journal of Marine Science, 2017, Vol.7, No.16, 141-160
154
Continued Table 18
Representative organs
Season
Metal concentration (μg/mL)
Cr
Mn
Zn
Ni
Cu
Pb
Cd
Fe
Gill
Premonsoon
7.831
4.983 43.026 5.521 19.431 1.123 0.554 208.968
Monsoon
10.719
8.431 36.125 3.469 10.615 0.363 ND
147.021
Postmonsoon
9.632
6.216 40.216 2.401 17.175 0.410 0.041 122.312
Brain
Premonsoon
7.685
6.132 18.512 1.562 7.619 1.012 0.730 112.016
Monsoon
5.072
4.349 11.137 2.019 6.853 0.215 0.139 106.139
Postmonsoon
8.160
12.293 15.021 1.039 6.981 0.837 0.147 130.325
Bone
Premonsoon
3.052
6.319 29.162 4.176 5.961 0.128 ND
55.252
Monsoon
2.619
3.347 27.410 2.517 3.863 0.612 0.136 49.013
Postmonsoon
2.953
4.216 33.625 3.062 11.132 0.571 0.421 31.315
Stomach
Premonsoon
4.974
4.343 12.121 2.012 4.563 0.496 0.395 60.152
Monsoon
1.119
3.319 7.510 1.121 6.341 0.363 0.068 50.746
Postmonsoon
2.241
5.492 11.029 1.342 5.712 0.562 0.097 55.421
Intestine
Premonsoon
2.135
5.612 9.325 0.381 5.019 0.525 0.041 9.216
Monsoon
1.981
1.057 6.519 0.289 3.081 0.224 0.127 48.423
Postmonsoon
2.030
3.304 8.612 0.519 4.801 0.382 0.052 51.461
Kidney
Premonsoon
1.954
3.061 7.521 0.961 4.018 0.506 0.250 11.016
Monsoon
1.021
1.527 11.134 0.614 3.424 0.258 0.090 10.026
Postmonsoon
2.016
2.137 9.025 0.825 3.612 0.577 0.201 22.794
Heart
Premonsoon
1.769
1.650 8.619 0.671 2.712 0.398 0.312 7.326
Monsoon
1.317
1.459 6.685 0.997 1.514 ND
ND
12.976
Postmonsoon
1.618
1.861 7.826 0.832 2.135 0.612 0.218 60.416
Air-bladder
Premonsoon
1.973
1.251 5.422 1.016 2.892 0.404 0.027 21.021
Monsoon
1.026
2.613 8.025 0.140 3.749 0.316 0.016 14.347
Postmonsoon
1.531
1.776 6.543 0.863 3.451 ND
0.057 6.532
The concentrations of Cu, Zn, Fe, Pb, Cr, and Ni in river and estuarine water vary from 0.025-0.136, 0.002-0.154,
0.695 to 19.54, 0.205 to 0.598, 0.0045 to 0.013, 0.064 to 0.245 and 0.0085 to 0.01065 mg
-l
respectively (Ahamed
et al.,
2003; Datta et al., 2008) and some study on the seasonal contamination level of heavy metals in water and
in sediments along the Karnafully estuary and its adjacent coastal area (Sarker, 1998; Sanjoy, 2007; Tamanna and
Hossain, 2010; Hossain, 2010) (Table 19; Table 20).
Table 19 Concentration of Lead (Pb) during rainy and winter season by at different sites
Season
Discharge opening of
Regent Textile
Discharge opening of
TK group
FIDC
Noakhal
Mean
WHO
standard
Rainy Season
BDL
BDL
BDL
BDL
BDL
0.01 mg/L
Winter season
BDL
BDL
BDL
BDL
BDL
Note: BDL = Below Detection Limit; Detection Limit of Instruments: For Pb 0.013 mg/L; Source: Dey et al. (2015)
Table 20 Comparing overall mean concentration of metals in the Karnafully river with WHO standards
Metal
Mean concentration in rainy
season (mg/L)
Mean concentration in winter
season (mg/L)
WHO standard (mg/L)
Comments
Cadmium (Cd)
0.008
0.0097
0.003
Above standard
Lead (Pb)
BDL
BDL
0.01
BDL
Nickel (Ni)
0.0278
0.0276
0.07
Below standard
Chromium (Cr)
0.0072
0.0073
0.05
Below standard
Note: BDL= Below Detection Limit ; Source: Dey et al. (2015)
Water is presently contaminated by heavy metals from dyeing industries and oil spills from ship braking industries
and ongoing vessels (Sarker, 1991; 1992; 2004; Sarker and Sarker, 1986; 1988).
