Record Display for the EPA National Library Catalog

RECORD NUMBER: 10 OF 13

OLS Field Name OLS Field Data
Main Title Fluorometric Flow Injection Determination of Aqueous Peroxides at Nanomolar Level Using Membrane Reactors.
Author Hwang, H. ; Dasgupta, P. K. ;
CORP Author Texas Tech Univ., Lubbock. Dept. of Chemistry and Biochemistry.;Environmental Protection Agency, Research Triangle Park, NC. Atmospheric Sciences Research Lab.
Year Published 1986
Report Number EPA-R-812366; EPA/600/J-86/456;
Stock Number PB88-185558
Additional Subjects Chemical analysis ; Atmospheric composition ; Peroxidase ; Trace elements ; Fluorometers ; Membranes ; Chemical reactors ; Hydrogen peroxide ; Experimental data ; Removal ; Injection ; Fluid flow ; Reprints ;
Holdings
Library Call Number Additional Info Location Last
Modified
Checkout
Status
NTIS  PB88-185558 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 09/04/1988
Collation 6p
Abstract
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.