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2,4-DINITROPHENYLHYDRAZINE COATED SILICA GEL CARTRIDGE METHOD FOR DETERMINATION OF FORMALDEHYDE IN AIR: IDENTIFICATION OF AN OZONE INTERFERENCE
Citation:
Arnts, R. AND S. Tejada. 2,4-DINITROPHENYLHYDRAZINE COATED SILICA GEL CARTRIDGE METHOD FOR DETERMINATION OF FORMALDEHYDE IN AIR: IDENTIFICATION OF AN OZONE INTERFERENCE. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-89/286 (NTIS PB90196676).
Description:
Two versions of the 2,4-dinitrophenylhydrazine method, a coated silica gel cartridge (solid) and acetonitrile impinger (solvent based), were used simultaneously to sample varied concentrations of ozone (0-770 ppb) and formaldehyde (20-140 ppb). zone was found to be a negative interference in the determination of formaldehyde by the 2,4-dinitrophenylhydrazine-coated silica gel cartridge method. t 120 ppb of ozone, formaldehyde at 40 ppb was under-reported by the cartridge method by 34% and at 300 ppb of ozone, formaldehyde measurements were 61% low. reater losses were seen at higher ozone concentrations. mpinger sampling (2,4-DNPH in acetonitrile) showed no formaldehyde losses due to ozone.