Full
Outline
To establish and optimize an analytical method based on inductively coupled plasma-mass spectrometry (ICP-MS) for the determination of Mg, Ca, Fe, Cu, Zn, Se and Pb content in infant formula goat milk powder.
The 3 kinds of sample pretreatment methods—graphite digestion, ultrasonic acid extraction and microwave digestion were systematically compared, with key parameters optimized respectively:The digestion system ratio and time for graphite digestion; the extraction acid concentration for ultrasonic acid extraction; and the digestion program and reagent dosage for microwave digestion. Methodological validation was performed through spiked recovery experiments, repeatability tests and certified reference material analysis to comprehensively evaluate the accuracy, precision and applicability of each method.
No significant differences were observed in the determination results among the 3 kinds of optimized methods (P>0.05). The limits of detection for the elements ranged from 0.0007 to 0.0941 mg/kg, spiked recoveries were between 88.2% and 110.8%, and the relative standard deviations (RSD) were all below 5.64%. The measured values of elements in the certified reference material were all within the certified ranges.
Under the premise of ensuring analytical quality, graphite digestion and ultrasonic acid extraction reduce the operation time by 55% and 70%, respectively, compared to microwave digestion. They also demonstrate advantages such as lower reagent consumption, reduced pollution risk and lower detection costs. These methods are more suitable for high-throughput rapid detection of multiple elements in infant formula goat milk powder, showing good application and promotion value.
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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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