Abstract: Objective To understand the pollution status of lead(Pb) and cadmium(Cd) in aquatic products of shellfish in Hainan Province,and to clarify the dietary exposure risk of Pb and Cd in shellfishin local. Methods A total of 356 shellfish products samples from 12 cities and counties in Hainan Province were collected from 2015 to 2023. The content of Pb and Cd were determined and the single factor pollution index(P_i) and nemerow integrated pollution index(P_summary) were used to evaluate the metallic element pollution level. Dietary risk assessment was carry out by point assessment and compared with the health guidance value or benchmark dose to assess the potential health risks of Pb and Cd in shellfish. Results The median concentration of Pb and Cd in shellfish were 0.138 and 0.372 mg/kg,respectively. The exceeding rate of Pb and Cd in shellfish were 2.53%(9/356) and 22.5%(80/356). The exceeding rate of Cd in shellfish was as follows：king scallop(40.0%)>scallop(39.0%)>oyster(33.8%)>tegillarcagranosa/Clam(13.3%)>white clam mactra(10.0%).There was a certain degree of mild cadmium contamination(P_i=0.55) in 356 shellfish samples,and the comprehensive pollution index of two metallic element in shellfish reached warning level(P_{shellfish summary}=0.76) in 2023. The assessment result showed that the average monthly dietary exposure range of Pb and Cd in shellfish consumed by each person were 0.26-0.80 and 1.16-3.57 μg/kg·BW,respectively,far below the healthy guidance value or benchmark dose. Conclusion There has been a certain degree of Pb and Cd pollution in shellfish in Hainan Province,but the probability of health risk Pb and Cd via dietary intake are at the acceptable level.

Key words: Shellfish, Lead, Cadmium, Risk monitoring, Risk assessment