Details

Autor(en) / Beteiligte

• Song, Junfeng
• Fu, Huafeng
• Guo, Wei

Titel

Determination of Ethanol Based on Polarographic Catalytic Current of Sulfate Radical Anion Using Ethanol as Catalyst

Ist Teil von

• Analytical letters, 2000-01, Vol.33 (11), p.2259-2269

Ort / Verlag

Philadelphia, PA: Taylor & Francis Group

Erscheinungsjahr

2000

Link zum Volltext

Quelle

Taylor & Francis Journals Auto-Holdings Collection

Beschreibungen/Notizen

• A new method for the determination of ethanol is proposed based on the catalytic current of sulfate radical anion SO 4 − . In 0.1 mol/L KH 2 PO 4 -Na 2 HPO 4 buffer (pH5.6±0.1)-1.6×10 −2 mol/L K 2 S 2 O 8 solution, the first order derivative peak current is proportional to ethanol concentration in the range of 1×10 −4 ∼9×10 −4 (r = 0.9998). The limit of detection is 6×10 −5 mol/L. The proposed method is applied to determine ethanol directly content in ardent spirits. The fundamental principle of the proposed method is that ethanol is oxidized by sulfate radical anion SO 4 − electrogenerated on the electrode surface to ethanol α-radical, and the reduction of the ethanol α-radical produces a polarographic reduction wave.