Masoomeh Emadi - Young Researchers and Elite Club, Marvdasht Branch, Islamic Azad University, Marvdasht, Iran
Mohammad AliZare Zare - ۱Young Researchers and Elite Club, Marvdasht Branch, Islamic Azad University, Marvdasht, Iran
Omran Moradlou - ۲Department of Chemistry, College of Sciences, Alzahra University, Tehran, Iran
Maryam Iranpour - Department of Science and Research Branch, Islamic Azad University, Fars, Iran

A new and simple method followed by atomic absorption spectrometry has been developedfor indirect determination of ascorbic acid (AA). The proposed method was based on the oxidationof AA to dehydroascorbic acid with Cu۲+cation(۲۰۰mgL-۱)in an ammonium thiocyanatesolution atpH۲.۴. AA reduces Cu۲+to Cu+followed by the precipitation of Cu+ with SCN-. Then, the excess ofCu۲+in the solution was measured by the atomic absorption spectrometry.The results showed thatAA can be sensitively measured in the linear range of ۲.۰ to ۴۰.۰ mgL-۱ with the detection limit of۱.۵mgL-۱.The relative standard deviation (%RSD) was ۰.۳۱۹ in ۷ determination of ۲.۰ mgL-۱ AA.Finally, the method was successfully used for the determination of AA in tablets containing variousamounts of AA.

Ascorbic acid, indirect determination, atomic absorption spectroscopy