Spectrophotometry Determination of Micro Amounts of Ascorbic Acid in Citrus Fruits Using Iron (III) and Dimethylglyoxime Reagent

I. Z. Al-Zamil, M. A. Al-Hajjaji, S. A. Al-Tamrah, A. M. Aziz-Alrahman and S. M. Sultan

Department of Chemistry, College of Science, King Saud University, Riyadh, Saudi Arabia.

ABSTRACT:

The described method depends on quantitative oxidation of ascorbic acid, naturally present in citrus fruits with a standard iron (III), followed by complexing the resultant iron (II) with dimethy-Jglyoxime. Forming the stable bisdimethylglyoxime-iron (II) complex. The distinctive red colour of this complex which was extracted with chloroform permits the determination of 0.04-0.50 mole of ascorbic acid with a relative standard deviation of 3%. Expected interferences were eliminated and comparison of the method with the standard iodimstric method gave satisfactory results and the advantages gained are discussed.

KEYWORDS:

Acid; Ascorbic; Dimethylglyoxime; Reagent

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Copy the following to cite this article: Al-Zamil I. Z, Al-Hajjaji M. A, Al-Tamrah S. A, Aziz-Alrahman A. M, Sultan S. M. Spectrophotometric Determination of Palladium With A Novel Reagent : 5-5' (3-(2-Pyridyl)-1,2,4-Triazine-5,6 Diyl) Bis-2-Furansulfonic Acid Disodium Salt. Orient J Chem 1986;2(1).

Copy the following to cite this URL: Al-Zamil I. Z, Al-Hajjaji M. A, Al-Tamrah S. A, Aziz-Alrahman A. M, Sultan S. M. Spectrophotometric Determination of Palladium With A Novel Reagent : 5-5' (3-(2-Pyridyl)-1,2,4-Triazine-5,6 Diyl) Bis-2-Furansulfonic Acid Disodium Salt. Orient J Chem 1986;2(1). Available from: http://www.orientjchem.org/?p=42346