• Title, Summary, Keyword: Cetyltrimethylammonium bromide (CTMAB)

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Spectrophotometric Determination of Scandium(III) with Eriochrome Cyanine R in the Presence of Cetyltrimethylammonium bromide (Cetyltrimethylammonium bromide에서 Eriochrome Cyanine R에 의한 스칸듐(III)의 분광광도법 정량)

  • Cha, Ki-Won;Park, Chan-Il;Kim, Jong-Whon
    • Analytical Science and Technology
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    • v.9 no.2
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    • pp.139-144
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    • 1996
  • The spectrophotometric determination method of scandium with eriochrome cyanine R(ECR) and the composition ratio of the complex were investigated in the presence of surfactants. The absorbance increase and red shift of maximum adsorption wavelength of Sc(III)-ECR complex were observed in cetyltrimethylammonium bromide (CTMAB), but those changes were not observed in the sodium dodecyl sulfate(SDS) and Triton X-100. A volume of 5ml of $1{\times}10^{-3}M$ ECR and 10ml of $2{\times}10^{-4}M$ CTMAB are necessary for the determination of $1{\times}10^{-7}{\sim}3.0{\times}10^{-6}M$ Sc(III) at pH 6.5. The apparent molar absorption coefficient of the Sc(III)-ECR-CTMAB, temary complex at 610nm is $5.6{\times}10^5mol^{-1}cm^{-1}L$ and its detection limit is $1.0{\times}10^{-7}M$. The binary complex composition of Sc(III)-ECR is 1:2 and the ternary complex composition of Sc(III)-ECR-CTMAB is 1:3:1.

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Spectrophotometric Determination of Rare Earths by Ternary Complex Formation with MTB and Surfactant (글로방전 발광분광법에 의한 란탄족 원소의 정밀 분석. MTB와 계면활성제의 삼성분 착물 형성에 의한 희토류 원소의 분광광도법 정량에 관한 연구)

  • Cha Ki-Won;Yun Jeong-Sook;Kim Kyung-Hwan;Ha Young-Gu;Kim Ha-Suek
    • Journal of the Korean Chemical Society
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    • v.37 no.5
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    • pp.496-502
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    • 1993
  • Spectrophotometric determination of rare earth elements with MTB and the composition ratio were investigated in the presence of surfactants of cetylpyridinium chloride (CPC), Triton X-100, dodecyltrimethylammonium bromide (DTMAB) and cetyltrimethylammonium bromide (CTMAB) at pH 6.5. The colour development between MTB and rare earths in the presence of cationic surfactants was very stable and more sensitive than that in the absence of surfactants. The largest absorbance increase was provided by CPC, which was therefore chosen for determination of rare earth elements. REE-MTB-CPC complex has absorption maxima at 650 nm and obeys the Beer's law in the range of 0∼100 ng/ml. Molar absorptivity is $6.6{\sim}9.4{\times}10^4\;mol^{-1}l\;cm^{-1}$.

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