Biaduń Ewa, Sadowska Monika, Ospina-Alvarez Natalia, Krasnodębska-Ostręga Beata
Faculty of Chemistry, University of Warsaw, Pasteura 1, 02-093, Warsaw, Poland.
Mikrochim Acta. 2016;183:177-183. doi: 10.1007/s00604-015-1624-3. Epub 2015 Aug 29.
Alumina (AlO) with an average particle size of 63 μm was modified with the anionic surfactant sodium dodecyl sulfate (SDS) and then applied to (i) solid phase extraction and separation of both thallium(I) and thallium(III), and (ii) preconcentration of Tl(III) from waste water samples. Only Tl(III), in the form of its complex with diethylenetriaminepentaacetate (DTPA), was retained on the sorbent, from where it can be eluted with 40 % nitric acid. Thallium species were then quantified by ICP MS. The method was characterized by a LOD of 25 pg of Tl(I) and 160 pg of Tl(III) in 10 mL samples. A large excesses of Tl(I) over Tl(III) was tolerated, and relatively high levels of other metal ions, such as a 500-fold excess of Pb(II) and Cd(II), and a 2000-fold excess of Zn(II), respectively, do not interfere. The sorbent was easily prepared and possesses a high loading capacity, and these properties make it an attractive material for rapid and efficient extraction and speciation of Tl. Graphical abstract:Schematic of the SPE procedure for separation (with preconcentration) of Tl(III) from Tl(I) was developed and applied to direct speciation analysis of thallium in wastewater. Self-made columns packed with alumina coated with SDS were used. The method is resistant to interferences from Pb, Cd, Zn and tolerates a large excess of Tl(I) over Tl(III).
平均粒径为63μm的氧化铝（AlO）用阴离子表面活性剂十二烷基硫酸钠（SDS）进行改性，然后应用于：（i）铊（I）和铊（III）的固相萃取与分离，以及（ii）从废水样品中预富集铊（III）。只有以其二乙烯三胺五乙酸（DTPA）配合物形式存在的铊（III）保留在吸附剂上，可用40%硝酸将其从吸附剂上洗脱下来。然后通过电感耦合等离子体质谱法对铊的形态进行定量分析。该方法的特征在于，在10 mL样品中，铊（I）的检测限为25 pg，铊（III）的检测限为160 pg。可以耐受大量过量的铊（I）相对于铊（III）的情况，并且相对较高含量的其他金属离子，例如分别500倍过量的铅（II）和镉（II）以及2000倍过量的锌（II），均不会产生干扰。该吸附剂易于制备且具有高负载量，这些特性使其成为用于快速高效地萃取和分析铊形态的有吸引力的材料。图形摘要：开发了用于从铊（I）中分离（并预富集）铊（III）的固相萃取程序示意图，并将其应用于废水中铊的直接形态分析。使用了填充有涂覆SDS的氧化铝的自制柱。该方法抗铅、镉、锌的干扰，并且能耐受大量过量的铊（I）相对于铊（III）的情况。
