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Designation: D6562 − 12Standard Test Method forDetermination of Gaseous Hexamethylene Diisocyanate(HDI) in Air with 9-(N-methylaminomethyl) AnthraceneMethod (MAMA) in the Workplace 1This standard is issued under the f i xed designation D6562; 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 gaseoushexamethylene 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. It is not known at the present timewhether this represents a perfect separation of vapor andaerosol, and in any case, there are not separate exposurestandards for vapor and aerosol. Therefore, in comparing theresults for isocyanate against a standard, results from the twofractions should be combined to give a single total value. Thereason for splitting the sample into two fractions is to increaseanalytic sensitivity for the vapor fraction and also to give thehygienist or ventilation engineer some information concerningthe likely state of the isocyanate species. The analyses of thetwo fractions are different, and are provided in separate, linked,standards to avoid confusion. This test method is principallyused to determine short term exposure (15 min) of HDI inworkplace environments for personal monitoring or in ambientair. The analysis of the aerosol fraction is performed separately,as described in Test Method D6561.1.2 Differential air sampling is performed with a segregat-ing device. 2 The vapor fraction is collected on a glass f i berf i lter (GFF) impregnated with 9-(N-methylaminomethyl) an-thracene (MAMA).1.3 The analysis of the gaseous fraction is performed with ahigh performance liquid chromatograph (HPLC) equippedwith ultraviolet (UV) and f l uorescence detectors.1.4 The range of application of this test method, using UVand f l uorescence detectors both connected in serial, has beenvalidated from 0.006 to 1.12 µg of monomeric HDI/2.0 mL ofdesorption solution, which corresponds to concentrationsequivalent to 0.0004 to 0.075 mg/m 3 of HDI based on a 15-Lair sample. Those concentrations correspond to a range ofvapor phase concentrations from 0.06 ppb(V) to 11 ppb(V) andcover the established threshold limit value (TLV) value of 5ppb(V).1.5 The quantif i cation limit for the monomeric HDI, usingthe UV detection, has been established as 0.012 µg/2 mL ofdesorption solution and as 0.008 µg/2 mL, using the f l uores-cence detector. These limits correspond to 0.0008 mg/m 3 and0.0005 mg/m 3 respectively for an air sampled volume of 15 L.These values are equal to ten times the standard deviation (SD)obtained from ten measurements carried out on a standardsolution in contact with the GFF, whose concentration of 0.02µg/2 mL is close to the expected detection limit.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 and health practices and determine the applica-bility of regulatory limitations prior to use. See Section 9 foradditional hazards.2. Referenced Documents2.1 ASTM Standards: 3D1193 Specif i cation for Reagent WaterD1356 Terminology Relating to Sampling and Analysis ofAtmospheresD1357 Practice for Planning the Sampling of the AmbientAtmosphereD5337 Practice for Flow Rate Adjustment of Personal Sam-pling PumpsD6561 Test Method for Determination of Aerosol Mono-meric and Oligomeric Hexamethylene Diisocyanate (HDl)1 This test method is under the jurisdiction of ASTM Committee D22 on AirQualityand is the direct responsibility of Subcommittee D22.04 on Workplace AirQuality.Current edition approved April 1, 2012. Published May 2012. Originallyapproved in 2000. Last previous edition approved in 2011 as D6562 - 06(2011).DOI: 10.1520/D6562-12.2 The sampling device for isocyanates is covered by a patent held by JacquesLesage et al, IRSST, 505 De Maisonneuve Blvd. West, Montreal, Quebec, Canada.If you are aware of an alternative to this patented item, please provide thisinformation to ASTM Headquarters. Your comments will receive careful consider-ation at a meeting of the responsible technical committee, 1 which you may attend.3 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 States1