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FLUOROMETRIC FLOW INJECTION DETERMINATION OF AQUEOUS PEROXIDES AT NANOMOLAR LEVEL USING MEMBRANE REACTORS
Citation:
Hwang, H. AND P. Dasgupta. FLUOROMETRIC FLOW INJECTION DETERMINATION OF AQUEOUS PEROXIDES AT NANOMOLAR LEVEL USING MEMBRANE REACTORS. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-86/456 (NTIS PB88185558), 1986.
Description:
A flow injection system based on the p-hydroxphenylacetate-peroxide-peroxidase reaction allows the simultaneous determination of H2O2 and CH3HO2 at 50 samples/h with an LOD of 0.1 microgram/L (3 nM) H2O2. A pressurized porous PTFE membrane reactor introduces the enzyme and the pH of the flow stream is altered by introducing NH3 through a nonporous cation exchange membrane reactor. Excellent reproducibility, precision, and sensitivity are achieved with the membrane reactors and an inexpensive filter fluorometer with a monochromatic excitation source. Low levels of residual peroxide in water are found to be ubiquitous, and such levels return soon after the H2O2 is catalytically removed. Light, ultrasonication and amount of dissolved oxygen in water affect the rate and plateau levels of H2O2 formation.