铁矿石中痕量砷测定研究与应用

Research and Application of Determination of Trace Arsenic in Iron Ores

铁矿石中砷的测定方法众多。氢化物发生-原子荧光光谱分析方法把蒸汽进样技术与无色散原子荧光光谱测定的特点完美地结合起来,具有仪器结构简单、灵敏度高、气相干扰少和分析速度快等特点。通过试验可知,采用王水溶解试样,测量结果在允许差范围内,溶解试样比较完全,结果比较准确。矿石中痕量砷的测量过程中基体干扰比较大,加入硫脲-抗坏血酸混合溶液进行掩蔽,基体干扰能够有效地消除。该方法测定值与ICP测定值相比较,结果令人满意,该方法准确度较高。

There are many methods of arsenic determination in iron ore. Hydride generation atomic fluorescence spectrometry a- nalysis method makes colorless powder atomic fluorescence spectrometry for the determination of characteristics of perfect combine. It has the advantage of simple structure, high sensitivity, gas phase, less noise and speed characteristic analysis. The experiment shows： the samples are dissolved by aqua regia. The results and the actual value are in the allowable deviation range, the sample is dissolved completely, and the result are accurate. In the process of the measurement of trace arsenic in ore, the matrix interference is relatively large, the mixed solution of thiourea and ascorbic acid is added, and matrix interference can be effectively eliminated. The results of this method are compared with the results of ICP, they are satisfactory and the method is accurate.