Health risk assessment and metal contamination in fish, water and soil sediments in the East Kolkata Wetlands, India, Ramsar site

Abstract

East Kolkata Wetlands (EKW) is an important site for fish culture in sewage-fed areas, which are major receivers of pollutants and wastages from Kolkata. EKW is internationally important as the Ramsar site was declared on Aug 2002 with an area of 125 km2. EKW is a natural water body where wastewater-fed natural aquaculture has been practiced for more than 70 years. It is ecologically vulnerable due to the discharge of toxic waste through sewage canals from cities. Assessing the EKW to understand the inflow and load of the toxic metal (s) in fish, water, and sediments samples is essential. The field (samples collection from 13 sites) and lab (determination of toxic level of metals) based research were carried out to assess metal toxicity and health risk assessment in EKW. The levels of eighteen metals (18), namely Chromium, Vanadium, Cobalt, Manganese, Copper, Nickel, Zinc, Silver, Molybdenum, Arsenic, Selenium, Tin, Gallium, Germanium, Strontium, Cadmium, Mercury, and Lead, were determined using Inductively coupled plasma mass spectrometry (ICP-MS) in five fish tissues viz. muscle, liver, kidney, gill and brain, along with the water samples and soil sediments in 13 sampling sites. The bioaccumulation and concentration of metals in fish tissues, soil sediments, and water samples were well within the safe level concerning the recommendation of different national and international agencies except for a few metals in a few sampling sites like Cd, As, and Pb. The geoaccumulation index (Igeo) was also determined in the soil sediments, indicating moderate arsenic, selenium, and mercury contamination in a few sites. The contamination index in water was also determined in 13 sampling sites. The estimated daily intake (EDI), reference dose (RfD), target hazard quotient (THQ), slope factor and cancer risk of Cr, Mn, Co, Ni, Cu, Zn, As, Se, Cd, Pb and Hg from fish muscle were determined. Based on the results of the present investigation, it is concluded that fish consumption in the East Kolkata Wetland (EKW) is safe. The effects of bioaccumulation of metals in muscle tissue were well within the safe level for consumption as recommended by WHO/FAO.

Human Health Risk Assessment of Trace Metals in Water, Sediments and Edible Fish Species Collected from Idu-Uruan Beach, Akwa Ibom State, Nigeria

“…The highest amount of Zn was found in the muscles of Poropuntius laoensis (2,101.00 mg/ kg). The levels of Zn recorded in the gills of the examined fish in this study were higher than those reported in some selected literature (Table 3) except for the report of [34] in Labeo rohita collected at Kolkata wetland, India. Based on the values obtained, Zn concentrations found in gills of all fishes are below the proposed limit by the FAO/WHO [31] for human consumption of toxic compounds.…”

“…The higher Manganese concentrations may be as a result of addition from agricultural runoff, sewage which causes anemia and kidney damage. The values obtained for Mn in this study were higher than those reported by [34] with 1.92 mg/L and [36] in both dry (3.73 mg/L) and wet (4.27 mg/L) season collected from Ogbere River, Ibadan.…”

“…Various anthropogenic activities in this study area might not result in by-product with Zn being leached into the water body. Kumar [34] reported the value of Zn of (4.65 mg/L) compared to the value obtained in this study.…”

Copper and nanocopper toxicity using integrated biomarker response in Pangasianodon hypophthalmus

“…Contamination of aquatic systems has led to major environmental and health issues for both humans and aquatic animals. 1,2 Anthropogenic activities have increased the concentration of metals in natural water, impacting aquatic animals and subsequently human health. 3,4 Inorganic pollutants, such as metals, possess specific properties like dispersal, bioaccumulation, and biomagnification within aquatic food chains.…”

“…Metals are significant pollutants in aquatic ecosystems that affect aquatic organisms, including fish. Contamination of aquatic systems has led to major environmental and health issues for both humans and aquatic animals 1,2 . Anthropogenic activities have increased the concentration of metals in natural water, impacting aquatic animals and subsequently human health 3,4 .…”