电感耦合等离子体原子发射光谱法测定NiCu合金中铝钛铁硅
王丹,孙莹
(中国科学院金属研究所,辽宁沈阳 110016)
摘 要:采用盐酸、硝酸及氢氟酸溶解样品,采用基体匹配法配制标准溶液消除基体效应的影响,选择Al 396.152nm、Ti337.280 nm、Fe 238.204nm、Si251.611 nm为分析线,使用电感耦合等离子体原子发射光谱法(ICP-AES)测定NiCu合金中的铝硅铁钛。Al、Ti的质量分数在0.005%-1.0%范围内,Fe、Si的质量分数在0.10%-8.0%范围内,各元素质量分数与对应的发射强度呈线性,校准曲线线性相关系数不小于0.9996;方法中各元素检出限为0.0002%-0.0010%;测定结果的相对标准偏差为0.49%-3.0%;加标回收率为90.0%-105%。方法简单、快速,结果令人满意。Determination ofaluminum, titanium, iron and silicon in NiCu alloy by inductively coupledplasma atomic emission spectrometry
WANG Dan, SUN Ying
(Institute of Metal Reasearch ChineseAcademy of Sciences, Shenyang, Liaoning 110016, China)
Abstract: Thesample was dissolved with hydrochloric acid, nitric acid and hydrofluoricacid.The standard solution series were prepared by matrix matching method toeliminate the influence of matrix effect. Al 396.152 nm, Ti 337.280 nm, Fe 238.204nm, Si 251.611 nm were selected as analytical lines for the determination ofaluminum, titanium, iron, and silicon in NiCu alloy by inductively coupledplasma atomic emission spectrometry (ICP-AES). When the mass fraction of Al andTi were in the range of 0.005%-1.0%, Fe and Si were in the range of 0.10%-8.0%,the mass concentration of each element showed good linearity to the correspondingemission intensity. The linear correlation coefficients of calibration curveswere higher than 0.9996. The detection limits of elements in thismethod were between 0.0002% and 0.0010%. The relative standard deviations of determinationresults were between 0.49% and 3.0%. and the recoveries were between 90.0% and105%. This method was simple and rapid, and the results were satisfactory.表1 仪器工作参数
Table 1 Working parameters of instrument
参数 Parameter | 设定值 Setting value |
RF功率/W | 1400 |
泵速/(mL/min) | 1.5 |
辅助气流量/(L/min) | 0.2 |
雾化气流量/(L/min) | 1.0 |
等离子体气流量/(L/min) | 16 |
观测方式 | 径向 |
表2样品在三种不同基体绘制的标准曲线下的测定结果
Table 2 Thedetermination results of samples under three kinds of standard curves indifferent matrix
元素 Element | Ni60Cu30 w/% | Ni60 w/% | 空白试剂 w/% |
Al | 0.083 | 0.085 | 0.085 |
Ti | 0.067 | 0.069 | 0.068 |
Fe | 1.91 | 1.92 | 1.82 |
Si | 3.81 | 3.93 | 3.66 |
表3校准曲线的线性范围、相关系数和线性回归方程以及方法的检出限
Table 3 Linear range, correlation coefficient, linear regression equation,detection limit of the method
元素 Element | 分析线 Analysis line/nm | 线性范围 Linear range w/% | 线性回归方程 Linear regression equation | 相关系数 Correlation coefficient | 检出限 Detection limit w/% |
Al | 396.152 | 0.005-1.0 | y=14382 x+249.92 | 0.9999 | 0.0008 |
Ti | 337.280 | 0.005-1.0 | y=75537x+360.52 | 0.9996 | 0.0002 |
Fe | 238.204 | 0.10-8.0 | y=33307 x+1116.1 | 0.9998 | 0.0003 |
Si | 251.611 | 0.10-8.0 | y=8437.1 x+97.61 | 0.9997 | 0.0010 |
表4 精密度实验结果(n=6)
Table 4 Experiment results of precision (n=6)
样品编号 Sample No. | 元素 Element | 测定值 Found w/% | 平均值 Average w/% | 相对标准偏差RSD/% |
1 | Al | 0.18,0.17,0.17,0.17,0.18,0.17 | 0.17 | 3.0 |
Ti | 0.028,0.027,0.027,0.028,0.028,0.026 | 0.027 | 3.0 | |
Fe | 1.98,1.93,1.94,1.97,1.97,1.98 | 1.96 | 1.1 | |
Si | 4.21,4.10,4.11,4.17,4.17,4.20 | 4.16 | 1.1 | |
2 | Al | 0.083,0.085,0.081,0.080,0.083,0.086 | 0.083 | 2.8 |
Ti | 0.067,0.068,0.066,0.065,0.064,0.066 | 0.066 | 2.1 | |
Fe | 1.91,1.92,1.93,1.95,1.92,1.93 | 1.93 | 0.71 | |
Si | 3.81,3.84,3.83,3.82,3.85,3.80 | 3.83 | 0.49 |
Table 5 Experiment results of recovery (%)
元素 Element | 平均值 Average | 加标量 Added | 测定总量 Total found | 回收率 Recovery |
Al | 0.083 | 0.05 | 0.130 | 94.0 |
0.10 | 0.178 | 95.0 | ||
0.20 | 0.286 | 102 | ||
Ti | 0.066 | 0.05 | 0.111 | 90.0 |
0.10 | 0.163 | 97.0 | ||
0.20 | 0.263 | 98.5 | ||
Fe | 1.93 | 1.0 | 2.86 | 93.0 |
2.0 | 3.88 | 97.5 | ||
3.0 | 5.03 | 103 | ||
Si | 3.83 | 1.0 | 4.88 | 105 |
2.0 | 5.65 | 91.0 | ||
3.0 | 6.75 | 97.3 |