用3,6-双[(2-胂羧基苯)偶氮]-4,5-二羟基-2,7-萘二磺酰苯胺改性硅胶富集、分离痕量元素的研究

Enrichment and Separation of Trace Amount of Metal Ions by Silica Gel Modified With 3,6-Bis(2-arsonophenylazo)-4,5-dihydroxy-2,7-naphthalene Disulfonic Anilide

本文介绍了3,6-双[(2-胂羧基苯)偶氮]-4,5-二羟基-2,7-萘二磺酰苯胺(偶氮胂-DAL)改性硅胶的制备方法,研究了它的性质及其富集,分离Ti(Ⅳ),Zr(Ⅳ)、Hf(Ⅳ)的工作。研究结果表明,偶氮胂-DAL改性硅胶在6mol/L HClpH4.0的溶液中是稳定的;其对Zr(Ⅳ)的最大吸附量为20.9μmol/g;在1mol/L HCl介质中,经偶氮胂-DAL-SG柱预富集处理后,可将Zr(Ⅳ)、Hf(Ⅳ)与Ti(Ⅳ)、贵金属、常见过渡元素,稀土元素等金属离子直接分离,用普通分光光度法测定人工水样中Zr(Ⅳ)的下限可达10^(-9)g/g。

The preparation, properties of silica gel modified with 3,6-bis(2-arsonophenylazo)-4,5-dihydroxy-2,7-naphthalene disulfonic anilide (ADSG) and its application in the enrichment and separation of trace amount of metal ions are reported. ADSG is stable in a solution at the acidity between 6mol/L HC1 and pH4.0, and its maximum absorption capacity for Zr(Ⅳ) is 20.9 μmol/g. After enrichment through ADSG column, Zr(Ⅳ),Hf(Ⅳ) can be directly separated from Ti(Ⅳ), noble metals and transition metals etc.. Zr(Ⅳ) at 10^(-9)g/g level in artificial water sample after preconcentration can be measured accurately by spectrophotometry.