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In this study, a flow injection chemiluminescent method was developed for determination of ethylenediaminetetraacetate (EDTA). Determination of EDTA was achieved via the quenching of chemiluminescent (CL) signal of KMnO4-Na2SO3-H2O2 system, in which [image omitted] was found to be the main emitter. Under optimum analytical conditions, a detection limit of 4 × 10-13 M (3σ) and linear dynamic range of 2 × 10-12-5 × 10-6 M was obtained for EDTA. Relative standard deviation for 1 × 10-9 M EDTA was 1.5% (n = 11). Proposed method is simple, rapid with high sensitivity, and has wide linear range. Method was applied to the determination of EDTA in canned foods with satisfactory results. [ABSTRACT FROM AUTHOR]

A modified Trautz-Schorigin reaction, by using tannic acid-H2O2 system for the oxidation and determination of two kinds of carbonyl compounds was developed in this paper. It was found that formaldehyde and acetaldehyde could effectively enhance the chemiluminescence signals of tannic acid-H2O2 system in alkaline medium. Under optimized conditions, the proposed method has a linear range of 7 × 10-9-1 × 10-4 mol L-1 for formaldehyde and 1 × 10-8-1 × 10-4 mol L-1 for acetaldehyde with detection limits of 9 × 10-11 and 3 × 10-10 mol L-1, respectively. The relative standard deviations for 15 repeated measurements of 1 × 10-6 mol L-1 HCHO and CH3CHO are 1.13% and 1.65%, respectively. Analysis time per sample is 35 seconds. A comparison of results found by the proposed method with those obtained by a standard reference method provided good agreement. The proposed method is simple, rapid, convenient, and sensitive. [ABSTRACT FROM AUTHOR]