Kovalev I A, Bogacheva L V, Tsysin G I, Formanovsky A A, Zolotov Y A
Analytical Chemistry Division, Department of Chemistry, Lomonosov Moscow State University, Moscow 119899 GSP-3, Russian Federation.
Talanta. 2000 May 31;52(1):39-50. doi: 10.1016/s0039-9140(00)00314-3.
A number of aliphatic mono- and triamines have been investigated as potential reagents for solid phase extraction of Rh, Pd and Pt. Platinum group metals are recovered from hydrochloric acid solutions as ionic associates of their chloride complexes with protonated amines. The recovery of metals depends both on hydrophobic properties of amine and sorbent and on sorption behaviour of amine itself. For on-line solid phase extraction of platinum group metals 4-(n-octyl)diethylenetriamine and hyper cross-linked polystyrene sorbent SSPS have been applied. Quantitative recovery of rhodium and platinum in the form of their hexachloride complexes was achieved under non-equilibrium conditions of on-line dilution. Metals recovered are quantitatively eluted with 1 M hydrochloric acid solution in ethanol. A new FIA-FAAS method for the determination of Rh, Pd and Pt in solutions based on the decomposition of ores and alloys has been proposed. The RSD values are 0.03-0.08 at 50-ppb concentration level. The detection limits are 3-8 ppb for 1 min of preconcentration. The accuracy of the procedure was verified by the analysis of standard reference materials of sulfide ores and alloys.
人们研究了多种脂肪族单胺和三胺，将其作为固相萃取铑、钯和铂的潜在试剂。铂族金属从盐酸溶液中以其氯络合物与质子化胺的离子缔合物形式被回收。金属的回收率既取决于胺和吸附剂的疏水性质，也取决于胺本身的吸附行为。对于铂族金属的在线固相萃取，已应用了4-(正辛基)二乙烯三胺和超交联聚苯乙烯吸附剂SSPS。在在线稀释的非平衡条件下，实现了铑和铂以其六氯络合物形式的定量回收。回收的金属用1 M盐酸乙醇溶液定量洗脱。提出了一种基于矿石和合金分解的用于测定溶液中铑、钯和铂的新型流动注射-火焰原子吸收光谱法。在50 ppb浓度水平下，相对标准偏差值为0.03 - 0.08。预富集1分钟时，检测限为3 - 8 ppb。通过分析硫化矿石和合金的标准参考物质验证了该方法的准确性。
