<論文>海洋堆積物および間隙水中の砒素の定量

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Trace amounts of arsenic in sea water, sediment and its pore water were determined by using hydride generation and atomic absorption spectrophotometer. This procedure, basically, includes the generation of arsine (AsH_3) reduced by sodium borohydride solution, the condensation at the inner surface of quartz coil in the liquid nitrogen bath, and the atomization in the quartz cuvette heated at 1000℃ by the muffle furnace. The absorbance increased with the reaction time and the amount of water vapor in the vessel. Consequently, the reaction time was decided 6 min which was the shortest time for converting the total arsenic into arsine. The flow rates of the carrier gas of nitrogen is tightly related to the absorption signal. The favorable condition of flow rates of N-1 and N-2 were obtained to be 500ml/min and 800ml/min, respectively. The calibration curve slightly bended. We determined the concentration arsenic in actual samples from marine environment, the reproducibility was less than 5 % in the range of 0-10 ng level.
北海道東海大学の論文
1996-03-21