119
During premonsoon of 2014, dissolved Zn values ranged from 361.15 ± 5.87 ppb
(at Bagmara) to 576.89 ± 4.56 ppb (at Kakdwip); during monsoon it ranged from
479.11 ± 4.99 ppb (at Bagmara) to 654.34 ± 3.98 ppb (at Kakdwip) whereas, during
postmonsoon it ranged from 428.01 ± 4.93 ppb (at Bagmara) to 631.29 ± 3.76 ppb
(at Kakdwip). During premonsoon in the same year, dissolved Cu values ranged
from 109.04 ± 4.18 ppb (at Bagmara) to 159.93 ± 4.19 ppb (at Kakdwip); during
monsoon it ranged from 125.42 ± 4.01 ppb (at Bagmara) to 176.31 ± 4.56 ppb (at
Kakdwip) whereas, it ranged from 114.2 ± 3.98 ppb (at Bagmara) to 164.57 ± 3.98 ppb
(at Kakdwip) during postmosoon. Dissolved Pb values were found to range from
Fig. 5.4 Scientific name: Excoecaria agallocha; Local name: Genwa
Fig. 5.5 Map showing the sampling stations in and around the Indian Sundarbans
5 Mangroves: A Sink of Heavy Metals