Rapid determination of microamount of lead in titanium dioxide by atomic absorption spectrophotometry using a graphite atomizer

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Other Title
  • グラファイトアトマイザーを用いた原子吸光分析による二酸化チタン中の微量鉛の迅速定量法
  • グラファイト アトマイザー オ モチイタ ゲンシ キュウコウ ブンセキ ニヨル

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Description

Several analytical conditions have been examinated to determine rapidly a trace amount of lead in titanium dioxide with little pretreatment. A quantitative profile of lead absorption was obtained by introducing directly the mixture of sample and carbon powder into a graphite atomizer (Fig. 4).<BR>The procedure was as follows : 50 to 100 mg of sample was weighed. Carbon powder, 5 to 9 times as much amount as the sample, accurately weighed, added to the sample and mixed well in an agate mortar for 10 minutes. One to five mg of the mixture was introduced into a graphite atomizer, the amount being controlled by the lead content of the sample. The lead content of the sample was calculated from the calibration curve which was introduced 20 μl of the standard lead solution containing lead from 0.025μg/ml to 0.3μg/ml into a graphite atomizer.<BR>Interference from coexisting metals such as K, Ca, Al, Mn, Mg, Fe and Zn was studied in 500 times as much amount as 0.2 ppm of lead, there were little problems except K. But K was also found little problem by arring out with a background corrector. The time required for an analysis was about 15 minutes and the coefficients of variation was 3.1% for 5 ppm of lead and 2.4% for 30 ppm of lead in titanium dioxide.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 24 (5), 299-303, 1975

    The Japan Society for Analytical Chemistry

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