Seasonal assessment of trace element contamination in intertidal sediments of the meso-macrotidal Hooghly (Ganges) River Estuary with a note on mercury speciation.
作者： Priyanka Mondal , Rosivaldo de Alcântara Mendes , M.P. Jonathan , Jayanta Kumar Biswas , Kadarkarai Murugan
DOI: 10.1016/J.MARPOLBUL.2017.11.041
关键词: Mercury (element) 、 Environmental chemistry 、 Pollution 、 Environmental science 、 Contamination 、 Monsoon 、 Estuary 、 Stressed environment 、 Trace element 、 Enrichment factor
摘要: Abstract 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 majority TEs concentration (mg kg− 1) was encountered during monsoon with 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 homogeneous total Hg (THg = 17.85 ± 4.98 ng g− 1) recorded which methyl mercury (MeHg) shared minor fraction (8–31%) THg. Sediment pollution indices, viz. geo-accumulation index (Igeo) enrichment factor (EF) for (Igeo = 1.92–3.67; EF = 13.83–31.17) Ba (Igeo = 0.79–5.03; EF = 5.79–108.94) suggested high contamination from anthropogenic sources. From analysis it inferred that primarily originated lithogenic This study would provide latest benchmark TE first record MeHg this fluvial system recommends reliable monitoring to safeguard geochemical health stressed environment.
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