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Journal of the Korean Chemical Society (JKCS)

ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 42, Number 3
JKCSEZ 42(3)
June 20, 1998 

 
Title
Determination of Eu(III) by Fluorescence Spectrometry

형광분광법에 의한 Eu(III)의 정량
Author
Sang Hak Lee, Jong Hwan Han, sang Seob Choi

이상학,한종환,최상섭
Keywords
Abstract
리간드 증감 유발 형광을 이용한 형광 광도법으로 수용액 중의 Eu(Ⅲ) 이온을 Eu(Ⅲ)-terephthalic acid(TPA) 착이온의 방출 세기를 측정함으로써 정량하는 방법에 대하여 연구하였다. 들뜸 파장, pH, TPA의 농도 및 방출 파장의 방출 세기에 대한 영향을 조사하였다. Triton X-100에 용해시킨 Trioctylphosphine oxide(TOPO) 용액을 Eu(Ⅲ)-TPA 용액에 첨가하였을 때는 방출 세기가 현저히 증가함을 관찰하였다. Eu(Ⅲ) 이온검정 곡선의 직선 감응 범위와 검출 한계는 TOPO를 첨가하지 않았을 경우에는 들뜸 파장, pH 및 TOPO의 농도가 각각 284nm, 4.4 및 1.0×10-4M였을 때, 각각 1.0×10-6M ∼ 4.0×10-4M 및 1.0×10-6M였다. TOPO를 첨가하였을 경우에는 들뜸 파장, pH, TPA의 농도 및 방출 파장이 각각 256nm, 5.6, 3.5×10-4M 및 615nm였을 때, 각각 1.0×10-7M∼1.0×10-7M였다. Eu(Ⅲ) 이온을 본 방법으로 정량할 때의 방해 이온 효과에 대해서도 조사하였다.

Methods to determine EU(Ⅲ) ion in aqueous solution by fluorescence spectrometry based upon the ligand sensitized fluorescence of Eu(Ⅲ)-terephthalic acid (TPA) complex ion have been studied. The effects of excitation wavelength, pH, concentration of TPA and emission wavelength on the fluorescence intensity were investigated. The fluorescence intensity of the Eu(Ⅲ) complex ion was further increased with addition of trioctylphosphine oxide (TOPO). In this case Triton X-100 was used to dissolve TOPO in aqueous solution. The calibration curve for Eu(Ⅲ) was linear over the range from 1.0×10-6 M to 4.0×10-4 M and the detection limit was 1.0×10-6 M under the experimental conditions of 256 nm, 5.6, 3.5×10-4 M and 615 nm for excitation wavelength, pH, concentration of TPA and emission wavelength, respectively. When TOPO was added to the Eu(Ⅲ)-TPA system, the concentration range of linear response and the detection limit were 1.0×10-9 M to 1.0×10-4 M, 1.0×10-7 M, respectively under the experimental conditions of 284 nm, 4.4 and 1.0×10-4 M for excitation wavelength, pH and concentration of TOPO, respectively. Effects of interferences from various cations for the determination of Eu(Ⅲ) ion were also investigated.

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285 - 291
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