Effects of Acid and Pre-Reductant in the Analysis of Arsenic by Hydride Generation-Atomic Absorption Spectrometry

HG-AAS법에 의한 비소 분석에서 산 및 Pre-Reductant가 분석에 미치는 영향

  • Lim, Heon-Sung (Chemical Analysis Laboratory, Korea Research Institute of Chemical Technology) ;
  • Lee, Sueg-Geun (Chemical Analysis Laboratory, Korea Research Institute of Chemical Technology)
  • Received : 1999.10.25
  • Published : 2000.04.25

Abstract

Effects of acids and pre-reductants in the analysis of arsenic have been studied by hydride generation-atomic absorption spectrometry. The analytical results were strongly dependent on the acid concentrations. All the pre-reductants was very effective to observe the arsenic signal at strong acid concentrations (3 M-5 M). However, at the low acid condition (${\leq}0.1M$), L-cysteine only showed a reasonable effect on the absorption signal. When the sample was treated with the nitric acid, absorption signal was unstable and was also decreased. Although interference effects were observed from metal ions such as $Cr^{6+}$ and $Br^{5+}$ at low acid condition, the generation of hydride could be increased by the strong acid condition.

수소화물 발생법-원자흡수 분광계를 이용한 비소의 분석에서 금속이온의 은폐제로 사용되는 L-cysteine, thiourea, KI/ascorbic acid 등의 예비 환원제와 염산, 질산, 황산 및 이들의 1:1 혼산의 종류 및 농도가 비소의 분석에 미치는 영향을 비교 연구하였다. 대부분의 예비 환원제의 경우 3-5M 이상의 고농도 산 용액에서 비소에 대한 높은 흡괌도를 나타냈으나, 0.1M 이하의 낮은 산 용액에서는 L-cysteine을 제외하고는 극히 저조한 흡광도를 나타내었다. 질산 산성용액에서는 흡광도 신호의 불안정성이 심하였다. 방해물질로서 $Cr^{6+}$, $Br^{5+}$ 이온의 방해영향이 크게 관찰되었지만, 이때 예비 환원제는 수소화물 생성을 크게 증가시켰다.

Keywords

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