Spectrophotometric Study of Citric Acid With As(Iii) and As(V)

T. T. Niaki¹, K. Aghapoor² and K. Khosravi²*

¹Department of Chemistry, AZ-Zahra University, Zahra (Iran) ²Chemistry and Chemical Engineering Research Centre of Iran- P. O. Box 14335-186 (Iran)

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ABSTRACT:

In this work, the reactions between citric acid and the ions of As were studied. They are of complexation reaction and very sensitive to pH of the solution. We have determined that As (III) reacts at pH > 4 with citric acid to produce [C6H4O7AsOH] Na2. 3H2O complex, and As(V) reacts in pH > 5.2 to produce [C6H4O7AsO2H]Na4.7H2O. Unlike the citric acid complexes with MO6+, Fe3+ and Ca7+, the As3+ and As5+ are not UV active.

KEYWORDS:

Spectrophotometric study; Citric acid, As(III); As(V)