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In this paper, the rotating disc electrode atomic emission spectrometry (RDE-AES) was used to determine the content of 21 mental and pollution elements such as silver, aluminum, and barium and other pollutants in transformer insulating oil. The influences of the immersion depth of disk electrode and the homogenization method of oil sample on the test results were investigated, and the test method was verified with the standard oil and insulating oil samples. The results show that when the immersion depth of disk electrode is 1/3 of its diameter, the relative error of the detection results is small after 3 min of ultrasound and vigorous shaking. The detection limits of each elements is 0-1.07 μg/g, the relative standard deviations (RSD, n=6) are 0.7%-2.9%, and except for element V, the recoveries of the other 20 elements are 96.64%-110.01%. The element P content in insulating oil was used to evaluate the class A and class B uncertainties, and the uncertainty of each component was synthesized and expanded to obtain an uncertainty of (8.34±1.06)μg/g, (k=2). The uncertainty mainly comes from the standard oil, measurement repeatability, and daily standardization processes.
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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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