火焰原子吸收法测定高铁闪锌矿中铟含量的测量条件选择与优化

Selection and Optimization of Measuring Conditions for Determination of Indium in High-iron Sphalerite by Flame Atomic Absorption Spectrometry

针对高铁闪锌矿组成复杂、矿石中低含量铟的测定干扰因素多的情况,对火焰原子吸收光谱法测定高铁闪锌矿中铟含量的仪器工作条件、酸性介质及其浓度等影响因素进行了试验研究。结果表明:在波长为303.94nm,采用空气-乙炔火焰,燃烧器狭缝长度为100mm、宽度为0.4mm,试液进样量6mL/min的情况下,仪器最佳工作条件为:灯电流5mA;燃烧器高度7cm,乙炔流量1.8~2.0L/min,空气流量6.0L/min,待测样品最佳酸性介质为体积分数为10%的硝酸介质。

The composition of high-speed iron sphalerite is complex,and there are many interference factors in the determination of low-content indium.The paper made a study of the experimental conditions of the instrument working conditions,acid medium and its concentration,etc.for the determination of indium content in high iron content sphalerite by flame atomic absorption spectrometry.The research results show that at a wavelength of 303.94 nm,an air-acetylene flame,a burner slit length of 100 mm,a width of 0.4 mm,and a test solution injection volume of 6mL/min,the optimal working conditions of the instrument are:lamp current 5 mA;burner height 7 cm;acetylene flow rate 1.8~2.0 L/min;air flow rate 6.0L/min;the best acidic medium for the sample to be tested is nitric acid medium with concentration(V/V)%=10%.