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自1974年Nixon报道钽丝电热蒸发作为ICP-AES进样技术以来,这一技术已引起了人们的极大兴趣,受到越来越广泛的重视。电热蒸发(ETV)-ICP-AES是一种将蒸发和激发分步进行的联用技术。石墨是目前普遍使用的蒸发器材料。然而,在高温下某些元素和石墨材料可以发生碳化反应,形成热稳定的碳化物,使分析物蒸发不完全或根本不蒸发,从而影响分析结果的灵敏度和准确性。为了解决这一问题,我们曾提出了以聚四氟乙烯(PTFE)悬浮体为氟化剂,氟化辅助ETV-ICP-AES直接测定粉煤标样中钒和钛的新方法,其检出限
Since 1974, Nixon reported tantalum wire electrothermal evaporation as ICP-AES injection technology, this technology has drawn great interest, more and more attention. Electro-thermal evaporation (ETV) -ICP-AES is a combination of evaporation and excitation step by step. Graphite is the most commonly used evaporator material. However, some elemental and graphite materials can undergo carbonization reactions at elevated temperatures to form thermally stable carbides, which cause the analyte to evaporate incompletely or not at all, thereby affecting the sensitivity and accuracy of analytical results. In order to solve this problem, we have proposed a new method for the direct determination of vanadium and titanium in pulverized coal samples using PTFE suspension as fluorinating agent and fluoridation assisted ETV-ICP-AES. limit