Full
Outline
To establish an analytical method for the simultaneous determination of 25 kinds of elements in Apium graveolens powder using microwave digestion-inductively coupled plasma mass spectrometry(ICP-MS), and evaluate the practical application capability of the method through quality control assessment (test samples) conducted by the national food safety risk monitoring.
The samples were subjected to microwave digestion treatment and measured using the ICP-MS method in collision reaction cell mode, with matrix interference corrected by online internal standard. The linear range, limit of detection, precision and accuracy of the method were investigated. Utilizing the quality control assessment results of Pb, Cd, Hg and Ni from each participating laboratory, the proficiency was evaluated using the Z-score method.
The 25 kinds of elements exhibited good linear relationships within their respective concentration ranges, with r no less than 0.999. The limits of detection ranged from 0.0001 mg/kg to 0.4000 mg/kg, while the limits of quantitation spanned from 0.00029 mg/kg to 1.40000 mg/kg. For the Apium graveolens leaf reference material, the relative standard deviation (RSD) of 6 parallel measurements ranged from 0.4% to 9.9%, and all measured values fell within the uncertainty range. The assessment |Z| values for our laboratory were as follows: Pb: 2, Cd: 0.11, Hg: 0.86 and Ni: 0. All received satisfactory evaluations. Compared to other participating laboratories, our laboratory’s lead Z value was at the borderline, while the |Z| absolute values of cadmium, mercury and nickel were all less than 1, indicating excellent performance.
This method has high sensitivity, good accuracy and good reproducibility, and can meet the requirements of simultaneous determination of multiple elements in Apium graveolens and other substrates. The method has known limitations for the determination of aluminum, and it needs hydrofluoric acid assisted digestion to determine total aluminum. This method provides reliable technical support for food safety monitoring.
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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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