电感耦合等离子体质谱(ICP-MS)法测定磷矿石中的8种痕量金属元素

建立了四酸(硝酸-氢氟酸-高氯酸-硫酸)敞口分解-电感耦合等离子质谱法同时测定磷矿样品中钨、钼、铊、镉、铋、铀、钍、铬等8种微量元素的方法,结果和经典碱熔法比对,准确度满意.经过对易挥发元素、难溶元素影响的研究,选取了合适的分析同位素及采用干扰校正方程以消除质谱干扰,利用103 Rh和186 Re为内标元素,有效校正了...

Determination of 8 Trace Metal Elements in Phosphate Ores by ICP-MS

A method for the simultaneous determination of tungsten,molybdenum,thallium,cadmium,bismuth,uranium,thorium,and chromium in phosphate ore samples by inductively coupled plasma mass spectrometry after open wet digestion system of mixed four acid(nitric acid-hydrofluoric acid-perchloric acid-sulfuric acid)was established.Satisfactory and accuracy results were obtained compared with the classic alkaline solution method.The effect of volatile and insoluble elements in phosphate ores was discussed.Appropriate analytical isotopes were selected and interference correction equations were used to eliminate mass interference.Using ¹⁰³Rh and ¹⁸⁶Re as internal standard elements,the dynamic drift of the analysis signal was effectively corrected.The detection limit is 0.010—0.36μg/g,the precision is less than 6%,and the recovery is between 93.4%-108%.Without increasing the analysis cost,sample solution can also be used for the determination of other major and trace elements by ICP-OES and ICP-MS at the same time.The method is simple,fast,practical,and suitable for the detection of 8 elements in phosphate ores.