CSIR- National Institute of Oceanography, Regional Centre, Kochi, India.
Research Student, Bharathidasan University, Tiruchirappalli, India.
Environ Sci Pollut Res Int. 2023 Sep;30(45):101565-101584. doi: 10.1007/s11356-023-29112-5. Epub 2023 Aug 31.
Along the coastline, urbanisation and industrialization pose significant challenges to marine habitats and biodiversity. Most wastewater that reaches the marine environment contains toxic metals, which, as they are non-biodegradable, accumulate in the biota and enter the marine food chain. This study presents the concentration of nine heavy metals (Fe, Zn, Cu, Co, Cr, Mn, Ni, Pb, and Cd) in zooplankton (copepods) during the Spring Intermonsoon/Pre-Monsoon (April 2019) in the western Bay of Bengal (BoB). Higher Fe concentrations were found in copepods both nearshore (42,352 µg/g) and offshore (9835 µg/g). However, the relative amounts of heavy metals in copepods from 16 locations (eight nearshore and eight offshore) varied in the order of Fe > Zn > Cu > Co > Cr > Mn > Ni > Pb > Cd. The copepods in the nearshore locations had higher concentrations of heavy metals than those offshore. Compared to earlier data on heavy metals, particularly those that are physiologically non-essential and toxic, the current study demonstrates higher amounts of these metals in copepods in the inshore BoB [Ni (avg. 58.7 ± 5.5 µg/g), Pb (avg. 25.6 ± 4.7 µg/g), and Cd (avg. 16.4 ± 0.9 µg/g)]. Considering the strong East India Coastal Currents in the western BoB, trace metal-concentrated copepods could be transported too far along the Indian coastline from the current study area.
沿海水域的城市化和工业化给海洋生境和生物多样性带来了重大挑战。进入海洋环境的大多数废水都含有有毒金属，由于这些金属不可生物降解，它们会在生物群中积累，并进入海洋食物链。本研究在孟加拉湾西部（BoB）春季风/前季风期间（2019 年 4 月）展示了浮游动物（桡足类）中 9 种重金属（Fe、Zn、Cu、Co、Cr、Mn、Ni、Pb 和 Cd）的浓度。近海（42352μg/g）和近海（9835μg/g）桡足类中发现了较高的 Fe 浓度。然而，16 个地点（8 个近海和 8 个近海）桡足类中重金属的相对含量顺序为 Fe>Zn>Cu>Co>Cr>Mn>Ni>Pb>Cd。近海地区的桡足类重金属浓度高于近海地区。与先前关于重金属的数据相比，特别是那些生理上非必需和有毒的重金属，本研究表明 BoB 近岸地区桡足类中这些金属的含量更高[Ni（平均 58.7±5.5μg/g），Pb（平均 25.6±4.7μg/g）和 Cd（平均 16.4±0.9μg/g）]。考虑到孟加拉湾西部东印度沿岸流较强，富含痕量金属的桡足类可能会从当前研究区域沿印度海岸线被输送到很远的地方。
