炭酸リチウム-ホウ酸系融解-黒鉛炉原子吸光法による標準ケイ酸塩岩石中の銅の定量

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タイトル別名
  • Determination of copper in standard silicate rocks by graphite furnace AAS after lithium carbonate-boric acid fusion.
  • 炭酸リチウム‐ホウ酸系融解‐黒鉛炉原子吸光法による標準ケイ酸塩岩石中の銅の定量
  • タンサン リチウム ホウサンケイ ユウカイ コクエンロ ゲンシ キュウコウホウ

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抄録

A method was described for the determination of traces of copper in standard silicate rocks by fusion with a lithium carbonate-boric acid mixture followed. by graphite furnace AAS. About 200mg of powdered sample was fused with a mixture of 250mg each of lithium carbonate and boric acid. The cake was dissolved in 1M hydrochloric acid and diluted to exactly 50ml with the same acid. A 2.5ml aliquot was taken and diluted with 1M hydrochloric acid to 10ml. Ten μl of the solution was injected into the furnace. A Shimadzu AA-646 atomic absorption/flame spectrophotometer equipped with a Shimadzu GFA-4 graphite furnace atomizer and a deuterium-arc background corrector was used for the absorbance measurements. Wavelength, band width and current of the copper hollow cathod lamp were 324.7nm, 0.38nm and 7mA, respectively. The optimum program consisted of drying for 30s at 150°C (ramp mode), ashing for 20s at 250°C (step mode), atomization for 4s at 2300°C (step mode) and cleaning for 3s at 2800°C (step mode). Calibration solutions contained the same concentrations of hydrochloric acid and flux as used for the sample preparation. The results obtained for thirteen USGS and two GSJ standard rock samples are in excellent agreement with the recommended values. The relative standard deviations (n=35) were less than 10% (av. 4.1%) except those (1528%) for two ultramafic rocks.

収録刊行物

  • 分析化学

    分析化学 35 (9), T86-T89, 1986

    公益社団法人 日本分析化学会

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