修正된 아자이드 Winkler 法과 폴라로그래피에 依한 溶存酸素의 測定에 關한 하이드록설아민의 影響

Hydroxylamine Effect on the Determination of Dissolved Oxygen by the Azide-Modified Winkler Method and Polarography

Hydroxlamine effect on the determination of dissolved oxygen by the azide-modified Winkder method and polarography has been studied. It was found that hydroxylamine interference on the dissolved oxygen by the azide-modified Winklet method can be eliminated completely by using permanganate. An inexpensive and convenient polarograph device was constructed. Dissolved oxygen in an air-saturated 0.1 F KCl solution undergoes, independent of hydroxylamine concentrations a two-step irreversible reduction at the dropping electrode the H₂O₂ produced in the first step is reduced to H₂O in the second. Two waves of equal size result, the first with a half-wave potential (E1/2) at about -0.13 V and the second at about -0.91 V (vs. SCE).