INDIRECT SPECTROPHOTOMETRIC DETERMINATION OF ASCORBIC ACID WITH CHROMIUM (VI) BY FLOW-INJECTION ANALYSIS

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TAEI M.; SHAFIEI ALI

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Seminar Paper

Paper Information

Seminar: IRANIAN SEMINAR OF ANALYTICAL CHEMISTRY
Year:2014 | Issue:20

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Title

INDIRECT SPECTROPHOTOMETRIC DETERMINATION OF ASCORBIC ACID WITH CHROMIUM (VI) BY FLOW-INJECTION ANALYSIS

Author(s)

TAEI M. | SHAFIEI ALI | Issue Writer Certificate

Keywords

CHROMIUM (VI)

FIA INDIRECT SPECTROPHOTOMETRIC

ASCORBIC ACID

Abstract

A SIMPLE, FAST AND SENSITIVE FIA INDIRECT SPECTROPHOTOMETRIC METHOD FOR DETERMINATION OF ASCORBIC ACID (AA) IS PROPOSED. THE METHOD IS BASED ON A FIA INDIRECT SPECTROPHOTOMETRIC DETERMINATION OF ASCORBIC ACID USING THE OXIDATION OF SAMPLE BY KNOWN EXCESS AMOUNT OF CHROMIUM (VI) IN THE PRESENCE OF SULFURIC ACID. THE REMAINED CHROMIUM (VI) IS THEN REACTED WITH 1, 5-DIPHENYLCARBAZID (DPC) TO FORM A RED-VIOLET COLOR WHICH SHOWS AN ABSORPTION MAXIMUM AT 542 NM.THE ABSORBANCE IS FOUND TO DECREASE LINEARLY WITH INCREASING CONCENTRATION OF ASCORBIC ACID, WHICH IS CORROBORATED BY THE CALCULATED CORRELATION COEFFICIENT VALUE OF -0.9994. THE SYSTEM OBEYS BEER'S LAW FOR 0.3-30 MMOL L-1 OF ASCORBIC ACID. THE MOLAR ABSORPTIVITY AND RSD WERE CALCULATED TO BE 2.1 × 104 L MOL-1 CM-1 AND 2.5% (N=10), RESPECTIVELY. FLOW INJECTION AND CHEMICAL VARIABLES SUCH AS CHROMIUM (VI) AND SULFURIC ACID CONCENTRATIONWERE OPTIMISED FOR THE PROPOSED FI METHOD.THIS STUDY WAS CARRIED OUT BY ALTERING EACH VARIABLE IN TURN WHILE KEEPING THE OTHERS CONSTANT.THE PROPOSED METHOD WAS APPLIED SUCCESSFULLY TO THE DETERMINATION OF ASCORBIC ACID IN PHARMACEUTICAL PREPARATIONS AND FRESH FRUIT JUICES. THE RELIABILITY OF THE ASSAY WAS ESTABLISHED BY PARALLEL DETERMINATION BY THE STANDARD IODIMETRIC METHOD AND RECOVERY STUDIES.

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APA: Copy

TAEI, M., & SHAFIEI, ALI. (2014). INDIRECT SPECTROPHOTOMETRIC DETERMINATION OF ASCORBIC ACID WITH CHROMIUM (VI) BY FLOW-INJECTION ANALYSIS. IRANIAN SEMINAR OF ANALYTICAL CHEMISTRY. SID. https://sid.ir/paper/909414/en

Vancouver: Copy

TAEI M., SHAFIEI ALI. INDIRECT SPECTROPHOTOMETRIC DETERMINATION OF ASCORBIC ACID WITH CHROMIUM (VI) BY FLOW-INJECTION ANALYSIS. 2014. Available from: https://sid.ir/paper/909414/en

IEEE: Copy

M. TAEI, and ALI SHAFIEI, “INDIRECT SPECTROPHOTOMETRIC DETERMINATION OF ASCORBIC ACID WITH CHROMIUM (VI) BY FLOW-INJECTION ANALYSIS,” presented at the IRANIAN SEMINAR OF ANALYTICAL CHEMISTRY. 2014, [Online]. Available: https://sid.ir/paper/909414/en

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