Study on the Methods for the Determination of Ultra-trace Elements by Inductively Coupled Plasma Atomic Emission Spectrometry Using On-line Preseparation and Enrichment Techniques.

电感耦合等离子体（ICP）原子发射光谱法（AES）已取得实质性进展，使其成为分析研究和应用实验室的主要光谱工具之一。然而，存在一些局限性，特别是对于微量样品中的超痕量浓度水平的分析。本文介绍了ICP-AES与在线预处理方法相结合的各种方法，以扩大ICP-AES的使用范围并减少其局限性，具体如下：（1）采用微孔膜-膜相分离器，采用吸流（SF）或流动注射（FI）/液-液萃取法测定镉及其DDTC螯合物，采用T型相分离器测定铜及其大环二氧四胺螯合物，铍的乙酰丙酮螯合物在微孔膜管分离器上测定铍。(2)亚氨基二乙酸螯合树脂微柱SF/离子交换富集测定镉、铜和铅(3)采用微孔膜管式气液分离器，流动注射/氢化物发生法测定锗。(4)离子交换色谱分离/氢化物发生法用于硒（IV）和硒（VI）的形态分析和测定。(5)用于ICP-AES的石墨炉多功能进样系统。

Substantial progress has been achieved in inductively coupled plasma (ICP) atomic emission spectrometry (AES) placing it among the principle spectroscopy tools in analytical research and applications laboratoris. However, some limitations exist especially for the analysis of ultratrace concentration levels in minute samples. Various approaches are described to extend the use and reduce the limitations of ICP-AES combined with on-line fashion of pretreatment procedures as follows: (1) Suction-flow (SF) or flow-injection (FI)/liquid-liquid extraction for determination of cadmium with its DDTC chelate utilizing a microporous membrane-film phase separator, determination of copper with its macrocyclic dioxotetramine chelate using a T-piece phase separator, and deter-mination of beryllium with its acetylacetonato chelate with a microporous membrane-tube sparator. (2) SF/ion-exchange enrichment for determination of cadmium, copper, and lead by means of a mini-column of iminodiacetate chelating resin. (3) FI/hydride generation (HG) for determination of germanium using a microporous membrane-tube gas-liquid separator. (4) Ion-exchange chromato-graphic separation/HG for speciation and determination of selenium(IV) and selenium(VI). (5) Versatile sample introduction system with graphite tube furnace for ICP-AES.