• Title/Summary/Keyword: Chemical Determination

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Determination of Ni, Cr, Mo in Low Alloy Steel Reference Materials by Isotope Dilution Inductively Coupled Plasma Mass Spectrometry (동위원소희석 유도결합플라스마질량분석법에 의한 저 합금강 표준시료중의 Ni, Cr, Mo의 분석)

  • Suh, Jungkee;Woo, Jinchoon;Min, Hyungsik;Yim, Myeongcheul
    • Analytical Science and Technology
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    • v.16 no.1
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    • pp.82-89
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    • 2003

  • Isotope dilution mass spectrometry (IDMS) was applied to the determination of Ni, Cr, Mo in low alloy steel reference materials. The Mo isotope ratio measurement was performed by dynamic reaction cell inductively coupled plasma mass spectrometry (DRC-ICP/MS) using ammonia as a reaction cell gas. In the case of Ni and Cr measurement, all data were obtained at medium resolution mode (m/${\Delta}m=3000$) of double focusing sector field high resolution inductively coupled plasma mass spectrometry (HR-ICP/MS). For the method validation of the technique was assessed using the certified reference materials such as NIST SRM 361, NIST SRM 362, NIST SRM 363, NIST SRM 364, NIST SRM 36b. This method was applied to the determination of Ni, Cr and Mo in low alloy steel sample (CCQM-P25) provided by NMIJ for international comparison study.

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The Gravimetric Determination of Scandium by di-(2-ethylhexyl)phosphate

  • Cha Ki-Won;Jeong Eul-Sik
    • Bulletin of the Korean Chemical Society
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    • v.15 no.1
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    • pp.9-12
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    • 1994

  • The gravimetric determination of scandium by di-(2-ethylhexyl)phosphate(DEHPA) as a precipitant and the mole ratio of Sc-DEHPA arecipitation obtained in ethanol medium have been investigated. Scandium can be determined by gravimetric method of precipitation of Sc-DEHPA and the mole ratio of Sc-DEHPA is found as 1 :2 in ethanol medium.

  • https://doi.org/10.5012/bkcs.1994.15.1.9 인용 PDF

Mechanically Immobilized Copper Hexacyanoferrate Modified Electrode for Electrocatalysis Amperometric Determination of Glutathione

  • D. Davi Shankaran;S. Sriman Narayanan
    • Bulletin of the Korean Chemical Society
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    • v.22 no.8
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    • pp.816-820
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    • 2001

  • A new copper hexacyanoferrate modified electrode was constructed by mechanical immobilization. The modified electrode was characterised by cyclic voltammetric experiments. Electrocatalytic oxidation of glutathione was effective at the modified electrode at a significantly reduced overpotential and at broader pH range. The modified electrode shows a stable and linear response in the concentration range of 9 ${\times}$10-5 to 9.9 ${\times}$10-4M with a correlation coefficient of 0.9995. The modified electrode exhibits excellent stability, reproducibility and rapid response and can be used in flow injection analysis for the determination of glutathione.

  • https://doi.org/10.5012/bkcs.2001.22.8.816 인용 PDF