Displacement solid-phase extraction on mercapto-functionalized magnetite microspheres for inductively coupled plasma mass spectrometric determination of trace noble metals.
Displacement solid-phase extraction on mercapto-functionalized magnetite microspheres for inductively coupled plasma mass spectrometric determination of trace noble metals.
复制标题
DOI：
10.1016/j.aca.2011.02.055
复制
发表时间：
2011-04
影响因子：
6.2
通讯作者：
Yan Li;Yan-Feng Huang;Yan Jiang;Bo-lin Tian;Fei Han;Xiu‐Ping Yan
中科院分区：
文献类型：
--
作者：
Yan Li;Yan-Feng Huang;Yan Jiang;Bo-lin Tian;Fei Han;Xiu‐Ping Yan
通过将巯基功能化磁铁矿微球磁性固定到打结反应器 (KR) 的内壁上，并结合电感耦合等离子体质谱法，开发了一种流动注射在线置换固相萃取 (DSPE)，用于选择性富集和测定复杂基质中的痕量贵金属（Ru、Rh、Pd、Pt、Ir 和 Au）。与直接雾化样品水溶液相比，2.7 mL 水溶液的在线 DSPE 对六种贵金属的增强因子为 32–46，Ru 的检测限 (3 s) 为 2.1 ng L−1，Rh 为 1.9 ng L−1，Pd 为 2.5 ng L−1，Ir 为 1.8 ng L−1，Pt 为 1.9 ng L−1 Au 为 1.7 ng L−1。所开发方法的样品通量约为 20 个样品 h−1，对 30 ng L−1 水平的贵金属进行 11 次重复测定的相对标准偏差范围为 1.2% 至 2.1%。即使连续 140 个 DSPE 循环后，Ru、Rh、Pd、Pt、Ir 和 Au 的回收率仍保持在 90%。该方法成功应用于复杂基质中痕量Ru、Rh、Pd、Pt、Ir和Au的选择性测定。
A flow injection online displacement solid-phase extraction (DSPE) via magnetic immobilization of mercapto-functionalized magnetite microspheres onto the inner walls of a knotted reactor (KR) coupled with inductively coupled plasma mass spectrometry was developed for selective preconcentration and determination of trace noble metals (Ru, Rh, Pd, Pt, Ir and Au) in complex matrices. Online DSPE of 2.7 mL aqueous solution gave the enhancement factors of 32–46 for the six noble metals in comparison with direct nebulization of aqueous sample solution, and the detection limits (3 s) of 2.1 ng L−1for Ru, 1.9 ng L−1for Rh, 2.5 ng L−1for Pd, 1.8 ng L−1for Ir, 1.9 ng L−1for Pt and 1.7 ng L−1for Au. The sample throughput of the developed method was about 20 samples h−1, and the relative standard deviation for eleven replicate determinations of the noble metals at the 30 ng L−1level ranged from 1.2% to 2.1%. The recoveries of Ru, Rh, Pd, Pt, Ir and Au still maintained 90% even after successive 140 cycles of DSPE. The developed method was successfully applied to selective determination of trace Ru, Rh, Pd, Pt, Ir and Au in complex matrices.