电感耦合等离子体原子发射光谱法测定铝硅活塞合金中镧铈镨钕钇

采用硝酸和氢氟酸溶解样品,高氯酸冒烟赶氟避免生成氟化稀土沉淀,选择La 333.749nm、Ce 456.236nm、Pr 417.939nm、Nd 406.109nm及Y 371.030nm作为分析线,扣除背景点消除基体干扰,运用干扰系数法克服谱线间干扰,通过基体匹配法配制标准溶液系列消除基体效应的影响,使用电感耦合等离子体原子发射光谱法(ICP-AES)测定铝硅活塞合金中镧、铈、镨、钕和钇。结果表明:镧、铈的测定范围在0.01%~2.00%,镨、钕、钇的测定范围在0.005%~2.00%,校准曲线线性相关系数不小于0.9998。方法中各元素检出限为0.0003%~0.0018%。实验方法用于测定稀土铝合金合成试样中镧、铈、镨、钕和钇,结果的相对标准偏差(RSD,n=6)在0.50%~2.4%之间,加标回收率在94%~105%之间。实验方法用于含有稀土的铝合金标准样品中镧、铈、镨、钕和钇的测定,结果与电感耦合等离子体质谱法(ICP-MS)测定值相吻合,测定的稀土总量RE与认定值也相吻合。

Determination of lanthanum,cerium, praseodymium,neodymium and yttrium in aluminum-silicon piston alloy by inductively coupled plasma atomic emission spectrometry

The sample was dissolved with nitric acid and hydrofluoric acid. The fluorine was removed by perchloric acid fuming to avoid the generation of rare earth fluoride precipitates. La 333.749nm, Ce 456.236nm, Pr 417.939nm, Nd 406.109nm and Y 371.030nm were selected as the analytical lines. The background points were deducted to eliminate the matrix interference. The spectral interference was overcome using interference coefficient method. The standard solution series were prepared by matrix matching method to eliminate the influence of matrix effect. The contents of lanthanum, cerium, praseodymium, neodymium and yttrium in Al-Si piston alloy were determined by inductively coupled plasma atomic emission spectrometry (ICP-AES). The results showed that the determination range for lanthanum and cerium was 0.01%-2.00%, and the determination range for praseodymium, neodymium and yttrium was 0.005%-2.00%. The linear correlation coefficients of calibration curves were not less than 0.9998. The detection limits of elements were between 0.0003% and 0.0018%. The contents of lanthanum, cerium, praseodymium, neodymium and yttrium in synthetic sample of rare earth aluminum alloy were determined according to the experimental method. The relative standard deviations (RSD, n=6) were between 0.50% and 2.4%. The recoveries were between 94% and 105%. The proposed method was applied for the determination of lanthanum, cerium, praseodymium, neodymium and yttrium in aluminum alloy standard samples containing rare earths. The found results were consistent with those obtained by inductively coupled plasma mass spectrometry (ICP-MS). The measured total content of rare earths was also in good agreement with the certified value.