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将自制微型ICP激发源与氢化物发生器组成实验平台,对溶液中的砷、汞进行了定性分析探索,解决了自制的微型ICP激发源无法测试液体样品的问题。采用硼氢化钠-盐酸体系在氢化物发生器中运用气动型断续流动发生法制取含砷、汞的氢化物气体样品。利用高纯氩作为载气将收集到的样品气体送入微型ICP激发源放电室,在RF功率为12 W,气压为70 Pa的工作条件下起燃后检测到光谱信号,利用Sepcline软件辨识出2条砷(211.30,234.98nm)元素谱线、2条汞(296.73,313.15 nm)元素谱线。实验分析得出了砷、汞检测所用盐酸和硼氢化钠的最佳配比。采用自制微型ICP激发源检测到砷、汞谱线,该激发源可用于液体砷汞样品的定性检测。
The homemade ICP excitation source and hydride generator are used as the experimental platform to qualitatively analyze arsenic and mercury in the solution, which solves the problem that the homemade ICP excitation source can not test the liquid sample. Hydride gas samples containing arsenic and mercury were prepared by a gas-phase intermittent flow method using a sodium borohydride-hydrochloric acid system in a hydride generator. Using high-purity argon as a carrier gas, the collected sample gas was sent to a micro-ICP excitation source discharge chamber to detect the spectral signal after being ignited under the operating conditions of an RF power of 12 W and a pressure of 70 Pa, and the signal was identified by using Sepcline software Two arsenic (211.30, 234.98 nm) elemental lines and two mercury (296.73, 313.15 nm) elemental lines. The best ratio of hydrochloric acid and sodium borohydride used in the determination of arsenic and mercury was obtained through experimental analysis. Arsenic and mercury spectrometry lines were detected with a home-made micro-ICP excitation source, which can be used for the qualitative detection of liquid arsenic and mercury samples.