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The iron ore samples are decomposed with the hydrochloric acid and hydrofluoric acid. After the perchloric acid smokes and silicon is eliminated, it is then extracted by butyl acetate solution of 1-phenyl-3-methyl-4- benzophthalide-5(PMBP). The interference elements of thorium are eliminated by the reextraction with hydrochloric acid, arsenazo III is as color developing agent and forms purple-red chelate with thorium ion as well as the thorium content in iron ore is determined with spectrophotometer. In the paper, the selection of acidity for extraction and reextraction, effects of such factors as acidity of chromogenic reaction, amount of color developing agent and color developing time on determination are discussed as well as experimental parameters are optimized. At the maximum absorption wavelength of 660 nm, the linearity range of thorium is determined to be 0~1.0 μg/mL, correlation coefficient is not less than 0.999 and detection limit is 0.000 44 μg/mL. This method is easy and simple to operate, molar absorption coefficient of the complex formed by arsenazo III and thorium is up to 0.8×105 L/(mol·cm), which is with higher sensitivity. The adding standard recovery of thorium in the analysis results of samples is 96.8%~105.8%, so the method is with good precision and accuracy.
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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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