Purpose To analyze the content of arsenic (As) and other heavy metals in fish and shrimp from Yangzonghai.
Methods In September 2022, 15 species of fish and shrimp samples were collected from Yangzonghai. In accordance with national food safety standards, the inorganic As, cadmium (Cd), lead (Pb), and total mercury (Hg) contents in these samples were measured. The mean index method was used to evaluate the overall heavy metal pollution, and the provisional tolerable weekly intake (PTWI) was used to evaluate the safety of consumption.
Results The inorganic As content in fish and shrimp samples ranged from not detected (ND) to 0.190 mg/kg, Cd content ranged from ND to 0.023 mg/kg, Pb content ranged from ND to 0.071 mg/kg, and total Hg content ranged from ND to 0.120 mg/kg. The inorganic As and Cd contents in shrimp were higher than in fish, with significant differences observed; and the total Hg content in fish was significantly higher than in shrimp. Among different fishes, the highest inorganic As content was found in Oreochromis nilotica, and Rhodeus ocellatus showed relatively high bioaccumulation of inorganic As, Cd, and Pb. The pollution index of shrimp was 0.107, indicating mild pollution; while the pollution index of fish was less than 0.5, indicating no pollution or light pollution. Based on the heavy metal content in the fish and shrimp, the weekly per capita intake of heavy metals was calculated to range from 0.020% to 3.500% of the PTWI standard value.
Conclusion The levels of the four heavy metals in the fish and shrimp samples from Yangzonghai are below the national food safety standards and the limits for toxic and harmful substances in non-polluted food. The overall pollution degree is classified as no pollution or lightly to mildly pollution. It is preliminarily concluded that the consumption risk of fish and shrimp from Yangzonghai is low.
DownLoad: