电感耦合等离子体原子发射光谱法测定二硼化钛增强铸铝复合材料中钛硼硅镁锌铁

采用氢氧化钠溶解样品,硝酸酸化,电感耦合等离子体原子发射光谱法(ICP-AES)测定二硼化钛增强铸铝复合材料中钛、硼、硅、镁、锌、铁。分别采用逐级稀释法、标准溶液系列使用基体匹配和无基体匹配这两种方法,考查铝的基体效应。结果表明,样品质量浓度在50～500 μg/mL范围内,铝基体对测定基本无影响。仪器选定的实验条件下,以无基体匹配的标准溶液系列绘制校准曲线,待测元素的线性方程相关系数均大于0.999 6。方法中各元素的检出限在0.000 9%～0.010%之间。将方法应用于TiB₂/AlSi复合材料实际样品中钛、硼、硅、镁、锌、铁的测定,结果的相对标准偏差(RSD,n=11)均小于3%,回收率在94%～113%之间;按照实验方法测定两个铸铝标准样品中硅、镁、锌和铁,测定值与认定值一致。

Determination of titanium,boron, silicon,magnesium, zinc and iron in cast aluminum composite material reinforced with titanium diboride by inductively coupled plasma atomic emission spectrometry

The sample was dissolved with sodium hydroxide. After acidification by nitric acid, the content of titanium, boron, silicon, magnesium, zinc and iron in cast aluminum composite material reinforced with titanium diboride was determined by inductively coupled plasma atomic emission spectrometry (ICP-AES). The matrix effect of aluminum was investigated by two methods, i.e., step-by-step dilution and standard solution series with and without matrix matching. The results showed that the aluminum matrix had no influence on the determination when the mass concentration of sample was in range of 50-500 μg/mL. Under the selected instrumental and experimental conditions, the linear correlation coefficients of testing elements were higher than 0.999 6 when the calibration curve was plotted by standard solution series without matrix matching. The detection limits of elements were between 0.000 9 % and 0.010 %. The proposed method was applied to the determination of titanium, boron, silicon, magnesium, zinc and iron in actual TiB₂/AlSi composite materials. The relative standard deviations (RSD, n=11) of determination results were all less than 3%. The recoveries were between 94% and 113%. The content of silicon, magnesium, zinc and iron in two standard samples of cast aluminum was determined according to the experimental method, and the found results were consistent with the certified values.