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石墨炉原子吸收测定锡的方法具有灵敏度高取样量少的优点,目前已被广泛地应用,但锡易与石墨管表面反应及锡的硫化物和氧化物的易挥发性质,使测定方法存在着原子化效率低,基体干扰严重和测量再现性差等问题。许多作者研究将石墨管表面涂层改性处理,期望提高锡原子化效率及再现性,用基体改进剂硝酸铵,抗坏血酸和磷酸二氢铵消除或降低基体干扰。近几年发展的L＇vov平台技术的应用,对某些元素在提高灵敏度和改善基体干扰方面已获得良好效果。
Graphite Furnace Atomic Absorption Spectrometry has the advantage of high sensitivity and low sampling volume and has been widely used at present. However, the reaction between tin and graphite tube surface and the volatility of sulfide and oxide of tin make the determination method exist Low atomization efficiency, serious matrix interference and poor reproducibility of measurement. Many authors have studied the modification of graphite tube surface coating in the hope of improving the tin atomization efficiency and reproducibility. Matrix modifiers such as ammonium nitrate, ascorbic acid and ammonium dihydrogen phosphate are used to eliminate or reduce matrix interference. The application of the L’vov platform technology, developed in recent years, has yielded good results for certain elements in terms of increased sensitivity and improved matrix interference.