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To understand the various metal elements content and distribution in crayfish sold in Deyang, and to initial determine the harm of hazardous metallic elements to residents in Deyang.
A total of 102 samples were collected in Deyang using a stratified random sampling approach, the samples was digested by microwave digestion,17 mineral elements and 7 harmful metal elements were detected using inductively coupled plasma optical emission spectroscopy (ICP-OES) and inductively coupled plasma mass spectrometry(ICP-MS).
Mineral elements in all parts of the crayfish were detected and the content varies, in terms of total minerals, crayfish brain> crayfish intestine> crayfish gills> crayfish meat> crayfish hepatopancreas. For harmful metals, there was no exceedance in crayfish meat, As, Cu, Cd in crayfish hepatopancreas exceeded the standard rate of 97.0%, 2.97%, 27.7%, Hg, Pb, Cr did not exceed the standard, As, Cu, Pb, Cr and Al were all exceeded the standard in the non-edible parts by 2.17% to 100%. The enrichment pattern of all metal elements in crayfish in Deyang and Hubei was consistent, but the contents varied. In different sampling sessions, none of the harmful metal elements in crayfish meat exceeded the standard; As, Cu, Cd in crayfish hepatopancreas exceeded the standard rate of 2.8%-97%, and the rest of the elements did not exceed the standard. In different growth stages, except for As, there was no significant difference in the accumulation of hazardous metal elements between green and red crayfish.
Crayfish have a high mineral content and abundant nutrients, and local residents in Deyang City have a lower risk of heavy metal hazards in their daily intake of crayfish.
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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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