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Standard Test Method for Determination of 2,4-Toluene Diisocyanate (2,4-TDI) and 2,6-Toluene Diisocyanate (2,6-TDI) in Workplace Atmospheres (1-2 PP Method)
Automaticky přeložený název:
Standardní zkušební metoda pro stanovení 2,4-toluendiisokyanátu (2,4-TDI) a 2,6-toluendiizokyanát (2,6-TDI) v ovzduší na pracovišti (1-2 PP metoda)
NORMA vydána dne 1.4.2013
Označení normy: ASTM D5836-08(2013)
Poznámka: NEPLATNÁ
Datum vydání normy: 1.4.2013
Kód zboží: NS-32737
Počet stran: 5
Přibližná hmotnost: 15 g (0.03 liber)
Země: Americká technická norma
Kategorie: Technické normy ASTM
Keywords:
2,4-toluene diisocyanate, 2,6-toluene diisocyanate,1-(2-Pyridyl)piperazine, 2,4-TDI, 2,6-TDI, air monitoring, high-performance liquid chromatography, sampling and analysis, workplace atmospheres, ICS Number Code 13.040.30 (Workplace atmospheres)
Significance and Use | ||||||||||
5.1 Diisocyanates are used in the production of polyurethane foams, plastics, elastomers, surface coatings, and adhesives (5,6). It has been estimated that the production of TDI will steadily increase during the future years. 5.2 Diisocyanates are irritants to eyes, skin, and mucous membrane and are respiratory sensitizers. Chronic exposure to low concentrations of diisocyanates produces an allergic sensitization which may progress into asthmatic bronchitis 5.3 The Occupational Safety and Health Administration (OSHA) has a permissible exposure limit (PEL) for 2,4-TDI of 0.02 ppm or 0.14 mg/m3 as a ceiling limit. There is no OSHA PEL for 2,6–TDI(9). The American Conference of Governmental Industrial Hygienists (ACGIH) has a time–weighted average (TWA) Threshold Limit Value (TLV) of 0.005 ppm or 0.036 mg/m3 and a short-term exposure limit (STEL) of 0.02 ppm or 0.14 mg/m3 for either 2,4–TDI, or 2,6–TDI, or for a mixture of 2,4– and 2,6–TDI(10). 5.4 This proposed test method has been found satisfactory for measuring 2,4 and 2,6-TDI levels in the workplace. |
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1. Scope | ||||||||||
1.1 This test method describes the determination of 2,4-toluene diisocyanate (2,4-TDI) and 2,6-toluene diisocyanate (2,6-TDI) in air samples collected from workplace atmospheres in a cassette containing a glass-fiber filter impregnated with 1-(2-pyridyl)piperazine (1-2 PP). This procedure is very effective for determining the vapor content of atmospheres. Atmospheres containing aerosols may cause TDI results to be underestimated. 1.2 This test method uses a high-performance liquid chromatograph (HPLC) equipped with a fluorescence or an ultraviolet (UV) detector (1-4).2,3 1.3 The validated range of the test method, as written, is from 1.4 to 5.6 μg of 2,4-TDI and 2,6-TDI which is equivalent to approximately 9.8 to 39 ppb for 2,4-TDI and 2,6-TDI based on a 20-L air sample. The HPLC method using an UV detector is capable of detecting 0.078 μg of 2,4-TDI and 0.068 μg of 2,6-TDI in a 4.0-mL solvent volume, which is equivalent to 0.55 ppb for 2,4-TDI and 0.48 ppb for 2,6-TDI based on a 20-L air sample. 1.4 The isomers of 2,4-TDI, and 2,6-TDI, can be separated utilizing a reversed phase column for the HPLC method. Because industrial applications employ an isomeric mixture of 2,4- and 2,6-TDI, the ability to achieve this separation is important. 1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.6 This standard does not
purport to address all of the safety concerns, if any, associated
with its use. It is the responsibility of the user of this standard
to establish appropriate safety and health practices and determine
the applicability of regulatory limitations prior to use.
Standard Practice for Sampling
Atmospheres to Collect Organic Compound Vapors (Activated Charcoal
Tube Adsorption Method) Standard Terminology Relating to Sampling
and Analysis of Atmospheres (Includes all amendments and changes
9/7/2020). Standard Practice for Planning the
Sampling of the Ambient Atmosphere Standard Practice for Conducting an
Interlaboratory Study to Determine the Precision of a Test
Method Standard Specification for Reagent
Water |
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