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Designation: D6561 − 20Standard Test Method forDetermination of Aerosol Monomeric and OligomericHexamethylene Diisocyanate (HDl) in Air with (Methoxy-2–phenyl-1) Piperazine (MOPIP) in the Workplace 1This standard is issued under the f i xed designation D6561; 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 This test method covers the determination of aerosolhexamethylene diisocyanate (HDI) in air samples collectedfrom workplace and ambient atmospheres. The method de-scribed in this test method collects separate fractions. Onefraction will be dominated by vapor, and the other fraction willbe dominated by aerosol. The results obtained from theanalysis of the separate fractions do not necessarily representthe true partition of the measured HDI physical phases, andshould only be considered a representation of the general trendin the physical phase partition within samples. The analyses ofthe two fractions are different, and are provided in separate,linked, standards to avoid confusion. This test method isprincipally used to determine short term exposure (15 min) ofHDI in workplace environments for personal monitoring or inambient air. The analysis of the vapor fraction is performedseparately, as described in Test Method D6562.1.2 Differential air sampling is performed with a segregat-ing device. The aerosol fraction is collected on a polytetraf l uo-roethylene (PTFE) f i lter.1.3 The analysis of the aerosol fraction is performed byusing a high performance liquid chromatograph (HPLC)equipped with an ultraviolet (UV) detector. An ultra highperformance liquid chromatograph (UPLC) can also be used,provided that its performance is equivalent to what is stated inthis standard. The range of application of the test method hasbeen validated from 0.052 to 1.04 µg of monomeric HDI/mL,which corresponds, based on a 15 L air sample, to concentra-tions from 0.004 to 0.070 mg/m 3 of HDI. Those concentrationscorrespond to a range of aerosol phase concentrations from 0.5ppb (V) to 10 ppb (V) and cover the established threshold limitvalve (TLV) value of 5 ppb (V).1.4 The quantif i cation limit for the monomeric HDI is 0.041µg per mL, which corresponds to 0.003 mg/m 3 for a 15 Lsampled air volume. This value is equivalent to ten times thestandard deviation obtained from ten measurements carried outon a standard solution in contact with the PTFE f i lter whoseconcentration of 0.1 µg/mL is close to the expected detectionlimit.1.5 The values stated in SI units are to be regarded asstandard. No other units of measurement are included in thisstandard.1.6 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, health, and environmental practices and deter-mine the applicability of regulatory limitations prior to use.See Section 9 for additional hazards.1.7 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards: 2D1193 Specif i cation for Reagent WaterD1356 Terminology Relating to Sampling and Analysis ofAtmospheresD1357 Practice for Planning the Sampling of the AmbientAtmosphereD4840 Guide for Sample Chain-of-Custody ProceduresD5337 Practice for Flow Rate Adjustment of Personal Sam-pling PumpsD6562 Test Method for Determination of Gaseous Hexam-ethylene Diisocyanate (HDI) in Air with 9-(N-methylaminomethyl) Anthracene Method (MAMA) in theWorkplace1 This test method is under the jurisdiction of ASTM Committee D22 on AirQuality and is the direct responsibility of Subcommittee D22.04 on Workplace AirQuality.Current edition approved March 1, 2020. Published May 2020. Originallyapproved in 2000. Last previous edition approved in 2016 as D6561 – 06 (2016).DOI: 10.1520/D6561-20.2 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.Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.