NINGBO CHEN WEI SUPPLY CHAIN MANAGEMENT CO.,LTD , https://www.nbchenweifurniture.comAfter the sample is leached and filtered by alkaline leaching, fluoride precipitates rare earth and thorium in the acid solution to separate it from niobium, titanium, iron, manganese, aluminum, phosphorus and other elements. After precipitation, nitric acid and perchloric acid are converted into solutions. At pH 5.5, in the presence of a masking agent, bromocresol green and xylenol orange are used as mixed indicators, and rare earth is titrated with DTPA complex.
Determination of total rare earths-fluorination separation, DTPA volumetric method