125
52.09 ± 2.67 ppm dry wt. (at Kakdwip) in leaf of A. alba. In 2014, for the same species the values ranged from 24.75 ± 2.15 ppm dry wt. (at Bagmara) during premonsoon to 94.18  ±  6.13  ppm dry wt. (at Kakdwip) during monsoon in root,
17.25 ± 1.60 ppm dry wt. (at Bagmara) during premonsoon to 84.47 ± 4.61 ppm dry
wt. (at Kakdwip) during monsoon in stem and 7.14 ± 0.50 ppm dry wt. (at Bagmara)
during premonsoon to 46.87 ± 3.60 ppm dry wt. (at Chemaguri) in leaf. For Cu, the
values in root, stem and leaf ranged from 13.89 ± 1.03 ppm dry wt. (at Bagmara)
during premonsoon to 35.12 ± 2.32 ppm dry wt. (at Kakdwip) during monsoon in
root, 10.56 ± 0.98 ppm dry wt. (at Bagmara) during premonsoon to 28.12 ± 2.01 ppm
Kakdwip
Harinbari
Chemaguri
Sagar south
Lothian island
Jambu island
Frasergunj
Gosaba
Chotomollakhali
Bali island
Sajnekhali
Bagmara
2013 Premonsoon
2013 Postmonsoon
2013 Monsoon
2014 Premonsoon
2014 Postmonsoon
2014 Monsoon
Concentration of Cu (ppm dry wt.)
45
35
25
15
5
0
10
20
30
40
Fig. 5.14 Spatio-temporal variations of biologically available Cu for the years 2013 and 2014 in
the selected stations
Kakdwip
Harinbari
Chemaguri
Sagar south
Lothian island
Jambu island
Frasergunj
Gosaba
Chotomollakhali
Bali island
Sajnekhali
Bagmara
2013 Premonsoon
2013 Postmonsoon
2013 Monsoon
2014 Premonsoon
2014 Postmonsoon
2014 Monsoon
Concentration of Pb (ppm dry wt.)
14
12
10
8
6
4
2
0
–2
Fig. 5.15 Spatio-temporal variations of biologically available Pb for the years 2013 and 2014 in
the selected stations
5 Mangroves: A Sink of Heavy Metals