Accumulation and contamination of lead in different trophic levels of food chain in sewage-fed East Kolkata Wetland, West Bengal, India
| Main Authors: | Debajyoti Kundu, Subinoy Mondal, Deblina Dutta, Smaranya Haque, Apurba R. Ghosh |
|---|---|
| Format: | Article Journal |
| Terbitan: |
, 2016
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| Online Access: |
https://zenodo.org/record/4668048 |
Daftar Isi:
- Abstract: Lead (Pb) is one of the common hazardous heavy metals posing severe toxicity problems in aquaculture productivity and human health by bioaccumulation and biomagnification due to its uncontrolled discharge into ecosystem in the age of modern industrialization and agricultural growth. The study was carried out to monitor the contamination status of heavy metal Pb in different trophic levels of the food chain in the ecosystem of sewage-fed East Kolkata Wetland (EKWL), the plankton as primary producer which is consumed by highest level consumer fish, Oreochromis niloticus, is the most abundant species in EKWL. The concentration of Pb in water and accumulation in different trophic components of food chain was analyzed by Atomic Absorption Spectrophotometer (AAS). Study shows that the Pb concentration in water of EKWL was 0.573 mg/l and in plankton and small insects the concentration of Pb was 0.0021 μg/mg and 0.0023μg/mg respectively. Accumulation of Pb in different organ of studied fish (Oreochromis niloticus) was highest in intestine (0.0182 μg/mg) and lowest in fin (0.0004 μg/mg) with an order as intestine > liver > skin > muscle > scale > bone > fin. Besides this, bioconcentration factor among different species in the trophic level was also studied wherein plankton (0.037) and adult fishes (O. niloticus) (0.325) showed lowest and highest values, respectively. The concentration of Pb in water was alarming but in fish musels were below as per WHO permissible level. However, this monitoring study should be frequent practice for the conservation of EKWL and proper biosafety in aquaculture practices in order to control the Pb contamination as well as to save environmental and human health from the serious hazardous problems of Pb contamination.