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Accurate determination of germanium (Ge) content in smelting dust is of great guiding significance for scientific recycling of smelting dust. Smelting dust contains a large amount of metastannic acid, which can encapsulate the sample, making it difficult to achieve complete decomposition using hydrochloric acid (HCl) and nitric acid (HNO3). A variety of sample dissolution methods were investigated, and complete sample decomposition was achieved by using sodium peroxide (Na2O2)-hydrochloric acid-nitric acid for sample digestion. Meanwhile, the temperature was controlled to avoid the volatilization loss of germanium. The analytical line of Ge at 259.253 nm was selected, and contents of sample solution were determined by inductively coupled plasma atomic emission spectrometry (ICP-AES). Overall, a method for determination of germanium in smelting dust was established. Under the optimized experimental conditions, mass concentration of germanium in the range of 0.50~15.00 µg/mL showed a good linear relationship with the emission intensity, with a linear correlation coefficient (r) of 0.99973, and a detection limit of 0.0013% (mass fraction). The matrix effect was investigated, and results showed that the coexisting elements in smelting dust had no significant influence on the determination of germanium. When the proposed method was applied to the determination of germanium in smelting dust samples, the relative standard deviation (RSD, n=11) ranged from 1.15% to 2.82%, and the recovery rate was in the range of 97.7% to 100.8%.
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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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