摘要
准确测定锂硼合金中杂质元素含量对于锂硼合金产品性能和质量控制具有重要意义。锂硼合金中锂含量较高,且其化学性质活泼、易燃,在空气中放置至充分氧化后,以水-硝酸溶解样品,采用基体匹配的方法绘制工作曲线,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)测定其中的镁、钙、铁、铝、铬5种杂质元素。考察了谱线选择、介质酸度、共存元素干扰、精密度以及加标回收试验,确定了最佳实验条件。结果表明,各待测元素在测定范围内其质量浓度与发射强度呈线性,校准曲线的相关系数均大于0.9999,方法测定下限为0.0047%~0.047%。按照实验方法测定锂硼合金中的5种杂质元素,相对标准偏差(RSD,n=11)在1.1%~3.1%之间,加标回收率在96.9%~105.9%之间。
The accurate determination of impurity content in lithium-boron alloy has great significance for the performance and quality control of lithium-boron alloy products.Lithium-boron alloys have high lithium content and are chemically active and flammable.After the sample is fully oxidized in the air,the sample is dissolved in water-nitric acid,and the working curve is drawn using the matrix matching method to eliminate the effect of the matrix effect.Then,the five impurity elements of magnesium,calcium,iron,aluminum,and chromium were detected using inductively coupled plasma-atomic emission spectrometry(ICP-AES).The spectral line selection,media acidity,coexisting element interference,precision,and spike recovery experiments were investigated,the best experiment conditions are confirmed.The mass concentration of each element within the measurement range is linear with the emission intensity,the correlation coefficients of the calibration curves are all greater than 0.9999,and the low limit of the method is 0.0047%~0.047%.Based on the experimental method,five impurity elements in lithium-boron alloys were determined,the spiked recoveries were in the range of 96.9%~105.9%with the relative standard deviation(RSD,n=11)was 1.1%~3.1%.
作者
李甜
陈雄飞
桑永珠
孙海峰
刘英
童坚
LI Tian;CHEN Xiong-fei;SANG Yong-zhu;SUN Hai-feng;LIU Ying;TONG Jian(Guobiao(Beijing)Testing&Certification Co.,Ltd.,Beijing 100088,China)
出处
《化学试剂》
CAS
北大核心
2020年第8期959-963,共5页
Chemical Reagents
关键词
锂硼合金
电感耦合等离子体原子发射光谱法
镁
钙
铁
铝
铬
lithium boron alloys
inductively coupled plasma atomic emission spectrometry
magnesium
calcium
iron
aluminum
chromium
