电感耦合等离子体原子发射光谱法测定矿石中的钨钼

来源期刊：冶金分析2010年第10期

论文作者：张宁

文章页码：25 - 28

关键词：电感耦合等离子体原子发射光谱法； 矿石； 钨； 钼

Key words：inductively coupled plasma atomic emission spectrometry； ore； tungsten； molybdenum

摘    要：采用碱熔酸化方法处理样品,电感耦合等离子体原子发射光谱(ICP-AES)法同时测定矿石中钨钼。研究了熔融试样时引入的基体元素钠对被测元素的干扰情况,结果表明基体效应明显存在,且随着Na量的增加,基体效应显著增强,仪器稳定性严重降低,影响测定结果的准确度。通过选择最佳的激发条件和适宜的分析线,采用稀释方法可以消除熔样引入和试样存在基体元素钠、铁、钙、铝的干扰。钨、钼的检出限分别为0.010μg/mL和0.004μg/mL,检测范围分别为0.03%~6%和0.01%~6%。对矿石标准物质进行测定,测得值与认定值一致,RSD在0.78%~2.7%之间。

Abstract: The ore sample was treated by alkali fusion and acidification,and tungsten and molybdenum were then simultaneously determined by inductively coupled plasma atomic emission spectrometry (ICP-AES).The interference of matrix sodium introduced during sample fusion to testing elements was investigated.The results showed that the matrix effect was obvious,and it was aggravate with the increase of sodium concentration.The instrumental stability was then seriously reduced,influencing the accuracy of determination results.By selecting optimal excitation conditions and proper analytical lines,the interference of matrix elements (sodium,iron,calcium and aluminum) contained in sample or introduced in sample fusion process could be eliminated by dilution.The detection limits for tungsten and molybdenum were 0.010 μg/mL and 0.004 μg/mL,respectively.The limit of detection for tungsten and molybdenum were 0.03%-6% and 0.01%-6%,respectively.The proposed method was applied to the determination of ore standard sample,and the results were consistent with the certified values.The relative standard deviations (RSD) were 0.78%-2.7%.