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Journal of the Korean Chemical Society (JKCS)

ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 31, Number 2
JKCSEZ 31(2)
April 20, 1987 

The Monohydrogen Arsenate-sensing Electrodes

Monohydrogen Arsenate 감응 전극
Gwon-Shik Ihn, Il-Bae Park

인권식, 박일배
Monohydrogen arsenate를 전위차법으로 직접 정량하기 위하여 네가지 성분인 Ag2S-PbS-PbHAsO4-Cu2S와 세가지 성분인 Ag2S-PbS-PbHAsO4로 된 전극이 제조되어 평가되었다. Ag2S : PbS : PbHAsO4 : Cu2S의 성분비(몰비)가 2.0:0.5:1.0:0.25인 전극이 전위차 감응, 안정도, 감응 속도와 재현성이 우수하였다. 0.1F NH4Ac-NH4OH 완중용액 중의 일정한 이온 강도와 pH 8.50으로 조정된 10-1 ∼ 10-4M HAsO42- 농도 범위에서 실험하였고, CN-, I-, S-2 와 Cl-등이 방해하였다.

Four component Ag2S-PbS-PbHAsO4-Cu2S and three component Ag2S-PbS-PbHAsO4 electrodes have been prepared and evaluated for the direct measurement of monohydrogen arsenate. The 3.0 : 0.5 : 1.0 : 0.25 (mole ratio, Ag2S : PbS : PbHAsO4 : Cu2S) composition is superior in terms of potentiometric response, stability, rapidity of response and reproducibility. Testing was done over the concentration range 10-1 ∼ 10-4M HAsO42- in 0.1F NH4Ac-NH4OH buffer solution at pH 8.50 with constant ionic strength. Interfering ions were CN-, I-, S-2 and Cl-.

162 - 167
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