Trace metal bioaccumulation in oysters (Crassostrea gigas) from Liaodong Bay (Bohai Sea, China)

Yonghua Liu,Yong Wang,Jiayu Xu,Song Yang

doi:10.1007/s11356-020-11968-6

Yonghua Liu, Yong Wang + Show 2 more

Open Access

https://doi.org/10.1007/s11356-020-11968-6

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Abstract

Cd, Cr, Cu, Pb, and Zn concentrations were measured in oysters (C. gigas), plankton, and seawater during spring, summer, and autumn in Liaodong Bay (Bohai Sea, China) to elucidate the effects of season, region, and oyster size on metal bioaccumulation in oysters. Metal concentrations were quantified via atomic absorption spectrophotometry. Our study determined that metal concentrations in oysters, plankton, and seawater were the highest in summer, whereas the lowest levels occurred in autumn. Regarding oyster sizes, the highest Pb levels occurred in C3-sized oysters (> 5-cm length), whereas the highest Cd, Cr, Cu, and Zn levels occurred in C2 (3–5-cm length) oysters. In contrast, the lowest Cu and Pb levels occurred in C1 (< 3-cm length) oysters, whereas the lowest mean Cd, Cr, and Zn concentrations were observed in C3 oysters. Significant differences in trace metal concentrations in the three sample types were observed in all sampling sites.

Highlights

With the development of human activities, various anthropogenic pollutants have been continuously discharged into the marine environment
The concentrations of other trace metals were within the GB 2762-2017 standards, our results demonstrate that Cd pollution in oysters from Liaodong Bay poses a substantial human health risk and should be monitored closely
The results of this study indicate that the bioaccumulation of trace metals in oysters from Liaodong Bay was season, spatial, and size-dependent

Summary

Introduction

With the development of human activities, various anthropogenic pollutants have been continuously discharged into the marine environment. Trace metals are considered the most important kind of marine pollutants (Rabaoui et al 2020, and 2014; Aydin and Tokalioglu 2015; Zhou et al 2014; Le et al 2016). Due to their persistence, non-degradability, bioaccumulation, and toxicity, trace metals can pollute seawater and sediments but can be accumulated in marine organisms through the food chain and become a human health. Monitoring trace metal pollution in Liaodong Bay is crucial (Zhang et al 2016; Eroglu et al 2015)

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