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X射线荧光光谱法测定稀土中单一稀土元素具有独特的优点,国内外已有不少报道。本文用滤纸片法,采用康普顿散射线内标法测定稀土矿中单一稀土元素,可以补偿仪器漂移的影响,消除基体效应引起的误差,具有制样简单,灵敏度高,溶样量少等优点。由于稀土元素在滤纸片上扩散速度不同,离子在滤纸片上分布不均,使分析结果产生较大误差。一般采用提高溶液浓度,减少点滴于滤纸片上的溶液体积消除离子扩散速度不均的影响。这些方法对低含量的样品取样量较多,给样品处理带来麻烦。我们用滤纸片把滴在滤纸片上的待测溶液限制在一定范围内,防止其扩散,提高制样精度,溶液浓度过低时,可多滴几次增加滤纸片上的溶液体积,不受不同离子扩散不均的影响。用本法测定了低含量稀土矿中10个稀土元素, 取得较好结果。 1 试验部分 1.1 仪器与试验条件日本岛津VF-320型X射线荧光光谱仪,端窗铑靶 X光管;管压-管流:40kV-60mA;LiF(200)晶体;闪烁计数管;真空光路;测量时间100s。
X-ray fluorescence spectrometry determination of rare earth elements in a single rare earth has unique advantages, many reports at home and abroad. In this paper, with the method of filter paper, Compton scattering internal standard method for the determination of a single rare earth element in rare earth ore, can compensate for the impact of instrument drift, eliminate the error caused by the matrix effect, with a simple sample preparation, high sensitivity, advantage. Due to the different diffusion rate of rare earth elements on the filter paper, the uneven distribution of ions on the filter paper, the analysis results have a greater error. Generally used to increase the concentration of the solution to reduce the volume of solution drip on the filter paper to eliminate the impact of uneven ion diffusion rate. These methods sample more samples at low levels, causing sample handling problems. We use the filter paper drops on the filter paper on the test solution is limited to a certain range, to prevent its proliferation, improve sample preparation accuracy, the solution concentration is too low, you can drop a few times to increase the volume of the filter paper solution, free from different ions The impact of uneven proliferation. By this method, the determination of 10 rare earth elements in the low content of rare earth ore, get better results. 1 Experimental 1.1 Instrument and test conditions Japan Shimadzu VF-320 X-ray fluorescence spectrometer, end window rhodium target X-ray tube; tube pressure - tube flow: 40kV-60mA; LiF (200) crystal; scintillation counter tube; ; Measurement time 100s.