Bioaccumulation characteristics and risk assessment of PAHs in the breeding cycle of Macrobrachium rosenbergii

Abstract:

Polycyclic aromatic hydrocarbons (PAHs) are carcinogenic organic pollutants composed of two or more benzene rings and are widely present in various environmental media. In order to understand the health risk of PAHs in Macrobrachium rosenbergii (M.rosenbergii) in the culture ponds in Jianguo Road,Caojing Town,Jinshan District,Shanghai,16 PAHs collected from M.rosenbergii in Jinshan District from July to September 2018 were determined.Concentrations were analyzed for cumulative characteristics over time and their potential food risks were calculated.The results showed that except for ANY,ANA,DBA,IPY and BPF,the other 11 PAHs were detected in different degrees.The concentration of ∑PAHs in M.rosenbergii in different periods ranged 47.6-106 ng/g dw.The dominant components of PAHs were 3- or 4-ring structure,of which 4-ring compounds accounted for the highest proportion,and the dominant monomers were ANT,BaA and CHR.Traceability analysis showed that the PAHs in the pond are mainly derived from the combustion sources.Using the US Environmental Protection Agency's (USEPA) recommended health risk model to evaluate the health risks caused by the consumption of Macrobrachium rosenbergii,the ILCR value of PAHs in M. rosenbergii culture farms in Jinshan District was at an acceptable level and would not have impact on the human health.