火焰原子吸收光谱法测定稀土镁硅铁合金中镁  

FAAS Determination of Magnesium in RE-Mg-Si-Fe Alloy

作　　者：孙梅[1] 吴强华[2] 

机构地区：[1]中国科学技术大学合肥微尺度物质科学国家实验室(筹),合肥230026 [2]中国科学技术大学高分子科学与工程系,合肥230026

出　　处：《理化检验（化学分册）》2011年第1期84-85,89,共3页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

基　　金：中国科学技术大学青年科学基金(KA2340000003)

摘　　要：稀土镁硅铁合金试样经氢氟酸和硝酸溶解后,用火焰原子吸收光谱法测定试样溶液中镁的含量。测定时,加入释放剂镧（Ⅲ）溶液,以消除共存物的干扰。镁的质量浓度在0.2-12.0 mg·L^-1范围以内与其吸光度呈线性关系,方法的检出限（3s）为0.057 mg·L^-1。方法用于两个稀土镁硅铁合金样品分析,加标回收率分别为99.4%,97.6%,相对标准偏差（n=11）分别为0.89%,0.43%。Sample of RE-Mg-Si-Fe alloy was dissolved with con.HF and con.HNO3,and Mg^2＋ in the solution was determined by FAAS.La（Ⅲ） solution as releasing agent was added to eliminate the interferences of coexisting ions.Linear relationship between values of absorbance and mass concentration of Mg^2＋ was kept in the range of 0.2-12.0 mg·L^-1,and detection limit（3s） of the method found was 0.057 mg L-1.The proposed method was applied to the analysis of two samples,giving values of recovery found by standard addition method of 99.4% and 97.6%,and RSD′s（n=11） of 0.89% and 0.43% respectively.

关 键 词：火焰原子吸收光谱法 镁 稀土镁硅铁合金 

分 类 号：O657.3[理学—分析化学]