Abstract:

The aim of the present study was to develop a novel analytical method for rapidly determining total organic matter in food plastic bag using flow injection coupled with chemiluminescence. Samples received ultrasonic-assisted extraction and subsequent microwave pressure digestion prior to the analysis with luminol-H2O2-Cr3+ flow injection chemiluminescence system. Chromium (Ⅲ) (considered equivalent to total organic matter) displayed a linear range of 1.154×10-10 to 1.154×10-5 mol/L (1/3Cr3+) and a detection limit of 4.476×10-11 mol/L (1/3Cr3+), with a relative standard deviation (RSD) of 3.1% (n = 3). The proposed method is characterized by high sensitivity, ease of operation, rapid determination and low cost. All these figures of merits benefit its promotion and popularization.

Key words: flow injection analysis, chemiluminescence, luminol system, food plastic bag, total organic matter