Citation:

Purdue, L. DETERMINATION OF THE STRONG ACIDITY OF ATMOSPHERIC FINE PARTICLES (<2.5 UM) USING ANNULAR DENUDER TECHNOLOGY. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/R-93/037 (NTIS PB93178234), 1993.

Description:

This report is a standardized methodology description for the determination of strong acidity of fine particles (less than 2.5 microns) in ambient air using annular denuder technology. his methodology description includes two parts: art A - Standard Method and Part B - Enhanced Method. he unique features of the annular denuder method which separates it from other established monitoring methods are elimination of sampling artifacts due to interaction between the collected gases and particles, and preservation of the samples for subsequent analysis. he Standard Method utilizes a denuder for removing ammonia and a filter assembly for determination of atmospheric strong acidity fine particle aerosols in ambient air, but does not account for potential interferences from nitric acid, ammonium nitrate aerosol or other ammonium malts which might bias the acidity measurement. he Enhanced Method adds an additional denuder upstream of the filter assembly to selectively removes acid games (nitric acid vapors, nitrous acid and sulfur dioxide) from the gas stream prior to filtration. n addition, backup nylon and citric acid impregnated filters are used to correct for biases due to the dissociation of ammonium nitrate aerosol. he techniques, procedures, equipment, and other specifications comprising this method are derived and composited from those actually used by the contributing research organizations and thereby known to be serviceable and effective. t this stage, thin method is a united, conscious, tentative method intended for further application and testing. he method in presented in document control format to facilitate appropriate changes as experience is gained with its use.

URLs/Downloads:

Record Details:

Document IDs: