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在1N盐酸介质中,使氟先与定量的锆、钍生成稳定的络合物,再使余下的锆钍与二甲酚橙(OX)显色生成红色络合物。该络合物可稳定15小时,最大吸收波长位于555nm,桑德尔灵敏度可达0.0004微克氟/厘米~2,0—30微克氟/50毫升范围符合比尔定律。在选定条件下,>300微克铝产生负干扰,当加入甘露醇可消除1毫克铝的干扰。其它元素共存允许量(微克)为:硅、铁(各500),钨(300),钙、镁(各100),锰(20),稀土元素、铀、镍、钴(各10),镓(5),钪(3),铍(2);硫酸根(2000),磷酸根(100)。6微克钛产生正干扰,可经碱熔沉淀分离消除;酒石酸有严重干扰。方法适用于黑、白云母单矿
In 1N hydrochloric acid medium, the fluorine first forms a stable complex with the quantitative zirconium and the thorium, and then the remaining zirconium thorium and the xylenol orange (OX) are colored to form a red complex. The complex is stable for 15 hours with a maximum absorption wavelength at 555 nm and Sander’s sensitivity of 0.0004 μg F / cm to 2,0-30 μg F / 50 ml complies with Beer’s law. Under the chosen conditions,> 300 micrograms of aluminum produced negative interference and 1 microgram of aluminum was eliminated when mannitol was added. The coexistence allowances of other elements are as follows: silicon, iron (each 500), tungsten (300), calcium and magnesium (each 100), manganese (20), rare earth elements, uranium, (5), scandium (3), beryllium (2); sulfate (2000), phosphate (100). 6 micrograms of titanium produced positive interference, can be separated by alkali melt precipitation; tartrate has a serious interference. Method for black and white mica single mine