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Designation: D6552 − 06 (Reapproved 2016)Standard Practice forControlling and Characterizing Errors in Weighing CollectedAerosols 1This standard is issued under the f i xed designation D6552; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (´) indicates an editorial change since the last revision or reapproval.1. Scope1.1 Assessment of airborne aerosol hazards in the occupa-tional setting entails sampling onto a collection mediumfollowed by analysis of the collected material. The result isgenerally an estimated concentration of a possibly hazardousmaterial in the air. The uncertainty in such estimates dependson several factors, one of which relates to the specif i c type ofanalysis employed. The most commonly applied method foranalysis of aerosols is the weighing of the sampled material.Gravimetric analysis, though apparently simple, is subject toerrors from instability in the mass of the sampling medium andother elements that must be weighed. An example is providedby aerosol samplers designed to collect particles so as to agreewith the inhalable aerosol sampling convention (see ISO 7708,Guide D6062, and EN 481). For some sampler types, f i lter andcassette are weighed together to make estimates. Therefore, ifthe cassette, for example, absorbs or loses water between theweighings required for a concentration estimation, then errorsmay arise. This practice covers such potential errors andprovides solutions for their minimization.1.2 The values stated in SI units are to be regarded asstandard. No other units of measurement are included in thisstandard.1.3 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards: 2D1356 Terminology Relating to Sampling and Analysis ofAtmospheresD4096 Test Method for Determination of Total SuspendedParticulate Matter in theAtmosphere (High–Volume Sam-pler Method)D4532 Test Method for Respirable Dust in Workplace At-mospheres Using Cyclone SamplersD6062 Guide for Personal Samplers of Health-RelatedAero-sol Fractions2.2 International Standards: 3EN 481 Workplace Atmospheres—Size Fraction Def i nitionsfor Measurement of Airborne Particles in the WorkplaceEN 13205 Workplace Atmospheres—Assessment of Perfor-mance of Instruments for Measurement of Airborne Par-ticle Concentrations2.3 ISO Standards: 4ISO 7708 Air Quality—Particle Size Fraction Def i nitions forHealth-related SamplingISO 20581 Workplace Atmospheres—General Require-ments for Performance of Procedures for the Measure-ment of Chemical AgentsISO 20988 Air Quality—Guidelines for Estimating Mea-surement UncertaintyISO GUM Guide to the Expression of Uncertainty in Mea-surement (1998)3. Terminology3.1 Def i nitions:3.1.1 For def i nitions of terms used in this practice, refer toTerminology D1356.3.2 Def i nitions of Terms Specif i c to This Standard:3.2.1 blank substrate—a collection medium or substratecoming from the same batch as the sampling medium, butunexposed.3.2.2 equilibration time—For the purposes of this practice, atime constant (seconds) characterizing an approximate expo-nentially damped approach of the mass of an aerosol collectionmedium to a constant value. The constant can be def i ned as the1 This practice is under the jurisdiction ofASTM Committee D22 on Air Qualityand is the direct responsibility of Subcommittee D22.04 on Workplace Air Quality.Current edition approved Nov. 1, 2016. Published November 2016. Originallyapproved in 2000. Last previous edition approved in 2011 as D6552 – 06 (2011).DOI: 10.1520/D6552-06R16.2 For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at service@astm.org. For Annual Book of ASTMStandards volume information, refer to the standard’s Document Summary page onthe ASTM website.3 Available from European Committee for Standardization (CEN), AvenueMarnix 17, B-1000, Brussels, Belgium, http://www.cen.eu.4 Available from American National Standards Institute (ANSI), 25 W. 43rd St.,4th Floor, New York, NY 10036, http://www.ansi.org.Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1