Evaluation of the performance of DNPH-coated silica gel and C18 cartridges in the measurement of formaldehyde in the presence and absence of ozone

Article Abstract:

An alternative method was developed to test the effects of interferences of dinitrophenylhydrazine-coated (DNPH) silica gel and octadecylsilica (C18) cartridges through the use of gas-phase calibration methods. The existence of formaldehyde, which is monitored by the Photochemical Assessment and Monitoring Stations, is tested through the use of cartridges with 2,4-DNPH. Results from the use of silica gel cartridges revealed HCHO values 5% lower than for gas-phase calibration values. C18 cartridge values were shown to be about 20% lower than reference standards.

All Other Basic Organic Chemical Manufacturing, All Other Basic Inorganic Chemical Manufacturing, Industrial organic chemicals, not elsewhere classified, Industrial inorganic chemicals, not elsewhere classified, Formaldehyde, Silica Gel, Measurement, Ozone

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Photochemical reactions involved in the total mineralization of 2,4-D by Fe3+/H2O2/UV

Article Abstract:

The waste treatment potential of Fenton-type oxidation ultraviolet systems was studied. Reverse-phase liquid chomatography was used to determine the herbicide 2,4-dichlorophenoxyacetic acid as radioactivity was measured by liquid scintillation. Carbon mineralization was accelerated with the consumption of dioxygen in the overall reactions. The oxidation method was found to be suitable for environmental application.

Physiological regulation, Iron compounds, Biomineralization

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Evidence for a surface dual hole-radical mechanism in the TiO2 photocatalytic oxidation of 2,4-dichlorophenoxyacetic acid

Article Abstract:

The oxidation of 2,4-dichlorophenoxyacetic acid in ultraviolet-illuminated TiO2 aqueous suspension is investigated. It is shown that hole oxidation produces products expected from one-electron oxidation of the carboxyl group and that alcohols have little effect on this process. The observed shift to the radical mechanism at low pH can be attributed to low oxidation potential or low coordinating ability.

Oxidation-reduction reaction, Oxidation-reduction reactions, Titanium dioxide

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