摘要
在pH 3.0的克拉克-鲁布斯缓冲溶液中,铂(Ⅳ)以PtBr_6^(2-)·2CTMAB^+的形式从含有0.59mol·L^(-1)硝酸钠、5.0×10^(-3)mol·L^(-1)溴化钾及3.0×10^(-3)mol·L^(-1)十六烷基三甲基溴化铵(CTMAB)的试液中定量浮选分离。此方法中浮选分离时试液的总体积定为10mL,其中含0.1mol·L^(-1)溴化钾溶液0.5mL,0.01mol·L^(-1)CTMAB溶液3mL及硝酸钠0.5g。试验结果表明:100μg铂(Ⅳ)有效地与多达1.0mg的铬(Ⅲ)、锰(Ⅱ)、铝(Ⅲ)、镍(Ⅱ)、镓(Ⅲ)、铁(Ⅱ)及锌(Ⅱ)分离,铂(Ⅳ)的浮选率达100%。此方法应用于已知含铂0.102%(质量分数)的Ni-Pt/ Al_2O_3催化剂的分析,测得铂量的平均值为0.099%,测定值的相对标准偏差(n=7)为2.2%。
In a clark-Lubs buffer medium of pH 3.0, platinum（Ⅳ） was quantitatively separated by floatation as PtB6^2- · 2CTMAB＋ from testing solution containing 0. 59 mol · L^-1 of NaNO3, 5. 0）〈 10-3mol · L^-1 of KBr and 3. 0）〈 10-3 mol · L^-1 of CTMAB. As a total volume of 10 mL was taken in the floatation process, 0. 5 mL of 0. 1 mol· L^-1 KBr solution, 3 mL of 0. 01 mol · L^-1 CTMAB solution and 0. 5 g of NaNO3 were added. As shown by experimental results 100 μg of Pt（Ⅳ） were effectively separated from as much as 1 000μg of Cr（ Ⅲ）, Mn（ Ⅱ）, Al（ Ⅲ ）, Ni（ Ⅱ）, Ga（ Ⅲ ）, Fe（ Ⅱ ） and Zn（ Ⅱ ）, achieving to a floatation rate of about 100%. The proposed method was applied to the analysis of sample of Ni-Pt/Al2O3 catalyst with known Pt content （w） 0. 102%. Result of average content of platinum found by this method was （w） 0. 099% and value of RSD＇s （n=7） calculated from the analytical data was 2. 2 %.
出处
《理化检验（化学分册）》
CAS
CSCD
北大核心
2008年第9期851-853,共3页
Physical Testing and Chemical Analysis(Part B:Chemical Analysis)
基金
河南省教育厅自然科学研究计划项目(2006150023)
