Journal of the Korean Chemical Society (대한화학회지)

Korean Chemical Society (대한화학회)
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Spectrofluorimetric Determination of Pb ion in Aqueous Media Using an Optical Sensor

광센서를 이용한 수용액 중 납이온의 형광분광법적 정량

  • Lee, Sang Hak (Department of Chemistry, Kyungpook National University) ;
  • Seo, Hyo Suk (Department of Sensor Engineering, Kyungpook National University)
  • Published : 2002.10.20
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Abstract

A method to determine lead ion in aqueous media using an optical sensor loaded on a fluorescent optode membrane incoporating a metal ion-selective ionophore, a proton-selective chromoionophore and lipophilic anionic sites has been studied. The effects of pH and thickness of membrane on the fluorescence intensity were investigated. The effects of foreign ions such as $Na^+$, $K^+$, $Mn^{2+}$ and $Zn^{2+}$ on the determination of lead ion were also studied. The linear range in the calibration curve for the determination of lead ion was found to be 5.0${\times}10^-7$ to 5.0${\times}$$10^-3$M and the correlation coefficient in this range was -0.99107 under the optimal experimental conditions. The relative standard deviation of the blank signals was 3.0% and the detection limit of lead ion was 5.0${\times}$$10^-9$M.

납이온과 선택적으로 상호작용하는 이온 운반물질(lead ionophore II)과 수소이온과 선택적으로 상호작용하면서 형광을 내는 변색성 이온 운반물질(ETH5294) 및 소수성의 음이온 자리를 포함하는 이온 선택성 광센서를 제조하여 형광분광법으로 수용액 중의 납이온을 정량하는 방법을 연구하였다. 시료용액의 pH,막두께 등이 형광세기에 미치는 영향을 조사하였다. $Na^+$, $K^+$, $Mn^{2+}$ 및 $Zn^{2+}$이온 등의 방해이온이 납이온의 정량에 미치는 영향을 조사하였다.본 연구에서 제작한 납이온 선택성 막을 이용하여 얻은 납이온 검정곡선의 직선범위는 5.0${\times}10^-7$M5.0${\times}10^-3$M이였고 이 범위에서의 상관계수는 -0099107이었다. 바탕용액의 상대표준편차는 3.0%였고 납이온의 검출한계는 5.0${\times}10^-9$M이었다.

Keywords

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