A Study for the Properties of Cupric Ion Selective Electrode and Its Applications 


Vol. 23,  No. 6, pp. 385-391, Dec.  1979


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  Abstract

CuS-Ag2S 분말에 PVC 분말을 4 : 1 의 비율로 섞어서 눌러 만든 구리이온 선택성전극은 재현성이 좋으며 견고하고 오래 사용할 수 있는 전극임을 알았다. 이 전극을 이용하여 구리이온에 대한 감응전위를 측정한 결과 Cu(Ⅱ)용액의 농도 1.0 × 10-1 M부터 1.0 × 10-5 M사이의 범위에서 직선관계를 나타내었고 기울기는 298˚K에서 Nernst의 법치긍로부터 약간 벗어난 25.0mV이었다. 이 전극을 지시전극으로 사용하여 시료용액 1.0 × 10-2 M Cu(NO3)2를 0.1M NaOH 표준용액으로 침전법 적정을 할 수 있었다. 또한 이 지시전극으로 Zn(Ⅱ), Mg(Ⅱ), Ca(Ⅱ), 등의 이온을 pH 10에서 EDTA로 적정할 수 있었고 이미 알려진 Cu-EDTA2-이 안정도상수(-pKCu-EDTA2-=18.80)를 이용하여 칼슘 및 마그네슘의 EDTA착물의 안정도 상수 (-pKCu-EDTA2-=10.30, -pKMg-EDTA2-=8.00)를 결정할 수 있었다. It was found that cupric ion selective electrode, which was prepared by mixing CuS and Ag2S with the ratio four to one and PVC, was hard and durable. The response potentials were reproducible and linear in the range from 1.0 × 10-1 M to 1.0 × 10-5 M copper (Ⅱ) solution and its slope was 25.0 mV per decade concentration at 298˚K, slightly different from Nernstian slope. The copper (Ⅱ) indicating electrode was applied in precipitation titration of 1.0 × 10-2 M Cu(Ⅱ) sample solution containing proper amounts NaNO3 with 0.1 M NaOH standard solution. Also, this electrode could be used in complex titration of Zn(Ⅱ), Mg(Ⅱ), Ca(Ⅱ) with EDTA and stability constant of EDTA complex of Ca(Ⅱ) and Mg(Ⅱ) was calculated by using known Cu-EDTA2- stability constant.

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  Cite this article

[IEEE Style]

K. Park, Y. Kwon, W. Huh, "A Study for the Properties of Cupric Ion Selective Electrode and Its Applications," Journal of the Korean Chemical Society, vol. 23, no. 6, pp. 385-391, 1979. DOI: .

[ACM Style]

Kee-Chae Park, Young-Soon Kwon, and Won-Do Huh. 1979. A Study for the Properties of Cupric Ion Selective Electrode and Its Applications. Journal of the Korean Chemical Society, 23, 6, (1979), 385-391. DOI: .

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ISSN(Print) 1017-2548
ISSN(Online) 2234-8530