Full
Outline
To establish an anodic stripping voltammetry method based on disposable screen-printed electrodes for the rapid quantitative detection of inorganic arsenic in grain, and systematically validate the proposed method.
Screen-printed electrodes were employed combining with rapid extraction and mild pretreatment methods. The optimal detection conditions were determined by optimizing the electrode geometry, carbon-based ink materials and the concentration of sodium tetrachloroaurate in the working buffer. The method was validated in terms of linear range, limit of detection, limit of quantitation, precision and accuracy. And it was compared with the liquid chromatography-inductively coupled plasma mass spectrometry method in GB 5009.11—2024 National food safety standard-Determination of total arsenic and inorganic arsenic in foods. Finally, the repeatability of the method was verified, and a method for on-site rapid screening was established.
Under the optimized conditions, the method exhibited a good linear relationship within the concentration range of 0.046–0.440 mg/kg, with a determination coefficient (r2) of 0.9991. The limit of detection was 0.018 mg/kg, and the limit of quantitation was 0.062 mg/kg. The spiked recoveries ranged from 85% to 92%, with relative standard deviations of 5.8%–12.4%. No significant difference was observed between the results of this method and those obtained by the GB 5009.11—2024. The paired t-test P for measurements from multiple instruments were all greater than 0.05.
This method is simple to operate, rapid and low-cost, making it suitable for on-site rapid quantitative detection in grain depots and processing enterprises, with good prospects for promotion and application.
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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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