TY - JOUR
T1 - Seasonal assessment of trace element contamination in intertidal sediments of the meso-macrotidal Hooghly (Ganges) River Estuary with a note on mercury speciation
AU - Mondal, Priyanka
AU - de Alcântara Mendes, Rosivaldo
AU - Jonathan, M. P.
AU - Biswas, Jayanta Kumar
AU - Murugan, Kadarkarai
AU - Sarkar, Santosh Kumar
N1 - Publisher Copyright:
© 2017 Elsevier Ltd
PY - 2018/2
Y1 - 2018/2
N2 - The spatial and seasonal distribution of trace elements (TEs) (n = 16) in surficial sediment were examined along the Hooghly River Estuary (~ 175 km), India. A synchronous elevation of majority of TEs concentration (mg kg− 1) was encountered during monsoon with the following descending order: Al (67070); Fe (31300); Cd (5.73); Cr (71.17); Cu (29.09); Mn (658.74); Ni (35.89). An overall low and homogeneous concentration of total Hg (THg = 17.85 ± 4.98 ng g− 1) was recorded in which methyl mercury (MeHg) shared minor fraction (8–31%) of the THg. Sediment pollution indices, viz. geo-accumulation index (Igeo) and enrichment factor (EF) for Cd (Igeo = 1.92–3.67; EF = 13.83–31.17) and Ba (Igeo = 0.79–5.03; EF = 5.79–108.94) suggested high contamination from anthropogenic sources. From factor analysis it was inferred that TEs primarily originated from lithogenic sources. This study would provide the latest benchmark of TE pollution along with the first record of MeHg in this fluvial system which recommends reliable monitoring to safeguard geochemical health of this stressed environment.
AB - The spatial and seasonal distribution of trace elements (TEs) (n = 16) in surficial sediment were examined along the Hooghly River Estuary (~ 175 km), India. A synchronous elevation of majority of TEs concentration (mg kg− 1) was encountered during monsoon with the following descending order: Al (67070); Fe (31300); Cd (5.73); Cr (71.17); Cu (29.09); Mn (658.74); Ni (35.89). An overall low and homogeneous concentration of total Hg (THg = 17.85 ± 4.98 ng g− 1) was recorded in which methyl mercury (MeHg) shared minor fraction (8–31%) of the THg. Sediment pollution indices, viz. geo-accumulation index (Igeo) and enrichment factor (EF) for Cd (Igeo = 1.92–3.67; EF = 13.83–31.17) and Ba (Igeo = 0.79–5.03; EF = 5.79–108.94) suggested high contamination from anthropogenic sources. From factor analysis it was inferred that TEs primarily originated from lithogenic sources. This study would provide the latest benchmark of TE pollution along with the first record of MeHg in this fluvial system which recommends reliable monitoring to safeguard geochemical health of this stressed environment.
KW - Hooghly River Estuary
KW - Methyl mercury
KW - Sediment pollution
KW - Trace elements
UR - http://www.scopus.com/inward/record.url?scp=85035357280&partnerID=8YFLogxK
U2 - 10.1016/j.marpolbul.2017.11.041
DO - 10.1016/j.marpolbul.2017.11.041
M3 - Artículo
C2 - 29475643
SN - 0025-326X
VL - 127
SP - 117
EP - 130
JO - Marine Pollution Bulletin
JF - Marine Pollution Bulletin
ER -