高周波炉を用いる加熱導入法による銀及び銅の高周波プラズマトーチ発光分析法

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タイトル別名
  • UHF-plasma torch emission spectrometry for silver and copper by vaporization introduction of solid samples with a high-frequency induction furnace
  • コウシュウハロ オ モチイル カネツ ドウニュウホウ ニヨル ギン オヨビ ド

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On the introduction of sample aerosol into the UHF-plasma torch, heating in a high-frequency induction furnace was utilized for silver and copper salts doped in a graphite powder (Nippon Carbon Co. SP-2). High purity nitrogen gas was supplied into the furnace at a rate of 100 ml/min, and produced aerosol was premixed with 3.0l/min argon gas, then introduced into the torch. The sample was heated in a graphite crucible. The measurements were made at 328.1 nm for silver and 324.8 nm for copper.<BR>Constant peak areas were obtained at >1100°C for silver nitrate, >1300°C for silver chloride, bromide, iodide, and sulfate, respectively. For copper salts, similar results were obtained at >1900°C for nitrate, and >1800°C for cupric chloride. Peak area for silver nitrate was the highest among various kinds of silver salts examined. On the contrary, in copper salts, the peak area of chloride was higher than that of nitrate. Those signals of silver chloride in the range of (0.7100)ng and of cupric chloride in the range of (102000)ng copper were calibrated. The linear relations were obtained above 5 ng silver and 100 ng copper, with a slope of 45° on the log-log plots. Below 5 ng silver and 100 ng copper, another linear relation with a slope less than 45° was obtained, which was considered to be responsible for the trace oxygen remaining in the system. The detection limits of silver chloride and cupric chloride were 0.5 ng as silver and 10 ng as copper, respectively. The coefficients of variation for several measurements were in the range of (1530)% for (0.10.2)μg of silver and (1.02.0)μg of copper.<BR>The efficiencies of introducing silver or copper salts were examined and the introduced species in the torch were discussed with reference to the peak areas.

収録刊行物

  • 分析化学

    分析化学 26 (3), 145-149, 1977

    公益社団法人 日本分析化学会

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