噻吩三氟甲酰丙酮/邻菲罗啉混合物修饰电极预富集-石墨炉原子吸收测定铕  

Determination of Europium (Ⅲ) by Graphite Furnace Atomic Absorption Spectrometry with Preconcentration by 2-Thenoyl Trifluoroacetone Phenanthrolene Modified Electrode

作　　者：何红波[1] 张文杰[2] 马光正[3] 沈含熙[3] 

机构地区：[1]沈阳工业学院基础课部,沈阳110016 [2]中国科学院金属研究所,沈阳110016 [3]南开大学化学系,天津300071

出　　处：《分析化学》2001年第10期1125-1128,共4页Chinese Journal of Analytical Chemistry

摘　　要：在ｐＨ＝５．２的（ＣＨ２）６Ｎ４－ＨＣｌ底液中，以噻吩三氟甲酰丙酮／邻菲罗啉（ＨＴＴＡ／ｐｈｅｎ）混合物修饰电极电解预富集２００ｓ后用石墨炉原子吸收法进行铕（Ｅｕ）的测定。工作曲线范围０．２９ ×１０－８～５．９ ×１０－８ｍｏｌ／Ｌ（Ｅｕ），相对标准偏差（ＲＳＤ）为５．２６％。Ｅｕ检出限（ＣＬ）可达到５．９×１０－１０ｍｏｌ／Ｌ，是ＨＴＴＡ修饰电极预富集的６３．５％，比采用热解涂层石墨管（ＰＧＴ）直接测量的文献报道值低两个数量级，是钽涂层石墨管（ＴａＰＧＴ）测量方式的１／２０。将两种试剂以适当浓度混合，在预富集过程中形成三元混配络合物，使测量灵敏度和选择性都有一定提高，常见高子不干扰测定，并可显著改善其它稀土元素存在对测定的干扰。A turgsten filament electrode decorated with a mixture of 2-Thenoyl trifluoroacetone (HTTA) and phenanthrolene (phen) were used for preconcentration of europium in (CH2 )6 N4 -HCl buffer, then the electrode was put into a pyrolysis coated graphite cup ( PGC) for direct atomization and measurement. The linearity range was found fmm0.29×10-8 to 5.9× 10-8 mol/L. The relative standard deviation(RSD) was 5.26% and the detection limit (CL) was 5.9× 10-10 mol/L, which was 63.5% to that of HTTA modified electrode and 100-fold lower than reported value determined by pyrolysis coated graphite tube ( PGT). This method is more sensitive and selective because ternary mixed ligand complex was formed when using two kinds of reagents with suitable ratio. Some common metal ions including aluminum and iron were tolerated, and the interference of rare earth metals was reduced notably.

关 键 词：混合配体 预富集 石墨炉原子吸收法 铕 测定 修饰电极 分析 噻吩三氟甲酰丙酮 邻菲罗啉 

分 类 号：O657.3[理学—分析化学]