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植物中的微量元素一般都能反映地下的地质情况。本实验的目的是:分析植物的微量元素,研究这些微量元素的信息,找出异常元素与成矿的联系。 1.实验 1) 样品制备 从北京和南方铀矿区采集茶籽油树、松树和杉树样品。每种树的取样地区均包括矿区和背景值区。样品重量平均为100g。采集的样品用清水洗净、晾干。把样品放入烘箱,温度105℃,约烘20小时。再放在电热板上炭化,不断搅动,至无烟,约1小时。把炭化的样品再在450℃下灼烧2小时。取植物灰20～30mg,装入φ6mm、高20mm的小铝筒内,并用铝箔包好。 2) 制标准 分别用分析纯的U_3O_8、ThO_2配制成盐酸体系的标准溶液,定量滴在同一滤纸片上与样品
Trace elements in plants generally reflect the underground geological conditions. The purpose of this experiment is to analyze the trace elements in plants, study the information of these trace elements and find out the relationship between the anomalous elements and mineralization. 1. Experiments 1) Sample Preparation Samples of tea seed oil, pine and fir trees were collected from Beijing and southern uranium mines. The sampling area for each tree includes the mining area and the background area. The sample weight averaged 100g. The collected samples were washed with water and dried. The sample into the oven, the temperature of 105 ℃, about bake 20 hours. Then on the hot plate carbonization, stirring constantly, to smoke-free, about 1 hour. The carbonized sample was again burned at 450 ° C for 2 hours. Take plant ash 20 ~ 30mg, into φ6mm, 20mm high aluminum tube, and wrapped with aluminum foil. 2) system standards were analytically pure U_3O_8, ThO2 formulated into a standard solution of hydrochloric acid system, quantitatively dropped on the same filter paper and the sample