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Objective To explore the contents of 7 kinds of elements in agricultural products in a certain area in North China plain, including lead (Pb), cadmium (Cd), mercury (Hg), arsenic (As), tin (Sn), nickel (Ni) and chromium (Cr), and evaluate the safety risks of dietary ingestion. Methods The samples were pretreated by microwave digestion, and the contents of 7 kinds of heavy metals in 611 agricultural products collected in the certain area from 2022 to 2024 were determined by inductively coupled plasma mass spectrometry (ICP-MS). Index (Pi), Nemero comprehensive pollutant index (PN) and target hazard quotient/total target hazard quota (THQ/TTHQ) were used to evaluate the pollution levels of heavy metals in agricultural products. Results All elements except Hg were detected in the agricultural products. Among them, the content of Pb and Cr in individual samples exceeded the limit values specified in GB 2762—2022 National food safety standard-Limits of contaminants in foods (Pb≤0.2 mg/kg, Cr≤0.5 mg/kg). The overall content levels of the 7 kinds of elements were relatively low, and their order in the agricultural products was Ni (0.192 mg/kg)>Cr (0.040 mg/kg)>Pb (0.017 mg/kg)>Sn (0.011 mg/kg)>As (0.009 mg/kg)>Cd (0.005 mg/kg), the heavy metal content of agricultural products in different types and regions was quite different, and the THQ/TTHQ of all agricultural products was less than 1, and the Pi and PN were less than 1. Conclusion The quality and safety of agricultural products in the study area are in good condition, and the level of heavy metal pollution is relatively low. However, there may be potential heavy metal exposure risks in some individual villages and towns in the southeastern part, and the dietary exposure risks for children are greater than those for adults.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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