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박기채,권영순,허원도,Kee-Chae Park,Young-Soon Kwon,Huh Won-Do 대한화학회 1979 대한화학회지 Vol.23 No.6
CuS-$Ag_2S$ 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 ${\times}$$10^{-1}M$부터 1.0 ${\times}$ $10^{-5}M$사이의 범위에서 직선관계를 나타내었고 기울기는 $298^{\circ}K$에서 Nernst의 법치긍로부터 약간 벗어난 25.0mV이었다. 이 전극을 지시전극으로 사용하여 시료용액 1.0 ${\times}$ $10^{-2} M Cu(NO_3)_2$를 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-$EDTA^{2-}$이 안정도상수($-pK_{Cu-EDTA^{2-}}$=18.80)를 이용하여 칼슘 및 마그네슘의 EDTA착물의 안정도 상수 ($-pK_{Ca-EDTA^{2-}}$=10.30, $-pK_{Mg-EDTA^{2-}}$=8.00)를 결정할 수 있었다. It was found that cupric ion selective electrode, which was prepared by mixing CuS and $Ag_2S$ 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 ${\times}$ $10^{-1}M$ to 1.0 ${\times}$ $10^{-5}M$ copper (II) solution and its slope was 25.0 mV per decade concentration at $298^{\circ}K$, slightly different from Nernstian slope. The copper (II) indicating electrode was applied in precipitation titration of 1.0 ${\times}$ $10^{-2} M Cu(II)$ sample solution containing proper amounts $NaNO_3$ 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-$EDTA^{2-}$ stability constant.
2016·17학년도 역사 중등교원 임용시험과 중국 근·현대사 사료문항의 부정확성
許元(Huh, Won) 역사교육연구회 2017 역사교육 Vol.144 No.-
The purpose of this study is to analyze Chinese modern history questions, and search for the problem and suggest desirable directions for the examination. Specifically, it analyzed the issues related to the Boxer Protocol (1901) and the common main principles of the Chinese People"s Political Consultative Conference (1949). It examined whether the basic contents of the information presented in question corresponded to the content of the original historical materials, whether the content of the original materials was faithfully translated, and whether there was any flaw with the accuracy and validity as examination questions. As a result, it was found that there were a number of problems in the translation of the basic information and the historical materials of the 2016 Boxer Protocol questions and the 2017 Common Main Principles questions. In addition, the general statement, which has a high possibility of being referenced by the examiners and the test-takes, was reviewed to look for problems and inaccuracies. It emphasized that when making examination questions through this process, it is necessary to prioritize the work of comparing with the original historical materials. It also pointed out that reference books and material usage should be done with caution. Since various errors were found in the related general statements and internet data review results.