碳酸钠-四硼酸钠碱熔-电感耦合等离子体发射光谱法测定铬铁矿石中11种元素

Determination of 11 Elements in Chromite Ores by Inductively Coupled Plasma-Atomic Emission Spectrometry with Sodium Carbonate-Tetraborate Alkali Melting

建立了用碳酸钠-四硼酸钠熔融分解样品,电感耦合等离子体发射光谱法同时测定铬铁矿石中铁、铝、钙、镁、硅、锰、磷、钛、钒、钴、镍等11种元素的方法。对熔剂用量、元素分析谱线、仪器条件参数选择和基体效应等进行讨论,考察了铬量对测定结果的影响。结果表明,铬对各元素的测定结果影响明显,采取在标准溶液中加入一定量铬、熔剂和盐酸,保持基体与试样一致,消除了基体效应。方法检出限为0.12～3.83μg/g,精密度(RSD,n=12)为0.65%～3.86%。经国家标准物质(GBW 07201、GBW 07202)进行验证,测定值和标准值一致,加标回收率为91.4%～107.2%。

A method has been developed to determine of Fe, Al, Ca, Mg, Si, Mn, P, Ti, V, Co and Ni in chromite ore by Inductively Coupled Plasma-Atomic Emission Spectrometry （ICP-AES） with sodium carbonate and tetraborate melting. The amount of fluxes, detecting lines, instrument working parameters and matrix effects are discussed in this paper. Moreover, the effect of different amounts of Cr on the detection results was investigated, which indicates that Cr influences the detection results significantly. The quantitative amount of Cr, fluxes and HCl were added to standard solutions to eliminate matrix effects. According to the concentration range of the elements in chromite ore, different concentrations of standard solution systems were prepared. The detection limits of the method were 0. 12 - 3. 83 μg/g, the RSDs were 0.65% - 3. 86% （n = 12）. National Standard Reference Materials （GBW 07201, GBW 07202 ） were analyzed and the results were in good agreement with the certified values and the recoveries were 91.4% - 107.2%.