Citation: Shao Mei WANG, Yun XING, Quan Min LI. Indirect Determination of Ascorbic Acid with Ammonium Sulfate and Isopropyl Alcohol by Extraction-flotation of Copper[J]. Chinese Chemical Letters, ;2003, 14(9): 983-986. shu

Indirect Determination of Ascorbic Acid with Ammonium Sulfate and Isopropyl Alcohol by Extraction-flotation of Copper

Shao Mei WANG ^1,2, ,
Yun XING ^1,2 ,
Quan Min LI ¹

1.
College of Chemistry and Environmental Science, Henan Normal University, Key Laboratory of Environmental Science and Engineering Education Commission of Henan Province, Xinxiang 453002;
2.
Department of Chemistry, Anyang Normal College, Anyang 455000

Received Date: 28 October 2003

A new method of indirect determination of ascorbic acid(Vc) with ammonium sulfate and isopropyl alcohol by extraction-flotation of copper is studied in this paper.It shows that a small amount of Cu(Ⅱ) can be reduced to Cu(Ⅰ) by Vc, then Cu(Ⅰ) reacted with the SCN-,which precipitated on the interface of isopropyl alcohol and H₂O.A good linear relationship is observed between the flotation yield(E) of Cu(Ⅱ) and the amount of Vc.The detection limit for Vc is 1.76μg/mL.The method is simple, rapid (5 min), but suffers from little interference of common anions and cations.It has been successfully applied for the determination of Vc in fruits.
- Ascorbic acid,
- isopropyl alcohol,
- extraction and flotation
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