引用本文:
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.
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.
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.
Indirect Determination of Ascorbic Acid with Ammonium Sulfate and Isopropyl Alcohol by Extraction-flotation of Copper
摘要:
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.
English
Indirect Determination of Ascorbic Acid with Ammonium Sulfate and Isopropyl Alcohol by Extraction-flotation of Copper
Abstract:
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.
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Key words:
- Ascorbic acid
- / isopropyl alcohol
- / extraction and flotation
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