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ASTM D6196-15
Standard Practice for Choosing Sorbents, Sampling Parameters and Thermal Desorption Analytical Conditions for Monitoring Volatile Organic Chemicals in Air
Automaticky přeložený název:
Běžná praxe pro výběr sorbenty, Vzorkování parametry a termické desorpce Analytické podmínek pro sledování emisí těkavých organických chemikálie Air
NORMA vydána dne 1.11.2015
Informace o normě:
Označení normy: ASTM D6196-15
Poznámka: NEPLATNÁ
Datum vydání normy: 1.11.2015
Kód zboží: NS-635691
Počet stran: 31
Přibližná hmotnost: 93 g (0.21 liber)
Země: Americká technická norma
Kategorie: Technické normy ASTM
Kategorie - podobné normy:
Anotace textu normy ASTM D6196-15 :
Keywords:
Place the sorbent or carrier tube in a compatible thermal desorption apparatus. As each tube in turn is sealed into the analytical flow path, system integrity should be checked to ensure there are no leaks which could lead to sample losses. Purge the air from each tube before heat is applied to avoid chromatographic artifacts arising from oxidation of the sorbent or damage to the chromatographic system. Heat the tube to displace the organic vapors which are pas
Doplňující informace
| Significance and Use | ||||||||||
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5.1 This practice is recommended for use in measuring the concentration of VOCs in ambient, indoor, and workplace atmospheres. It may also be used for measuring emissions from materials in small or full scale environmental chambers for material emission testing or human exposure assessment. 5.2 Such measurements in ambient air are of importance because of the known role of VOCs as ozone precursors, and in some cases (for example, benzene), as toxic pollutants in their own right. 5.3 Such measurements in indoor air are of importance because of the association of VOCs with air quality problems in indoor environments, particularly in relation to sick building syndrome and emissions from building materials. Many volatile organic compounds have the potential to contribute to air quality problems in indoor environments and in some cases toxic VOCs may be present at such elevated concentrations in home or workplace atmospheres as to prompt serious concerns over human exposure and adverse health effects 5.4 Such measurements in workplace air are of importance because of the known toxic effects of many such compounds. Note 1: While workplace air monitoring has traditionally been
carried out using disposable sorbent tubes, typically packed with
charcoal and extracted using chemical desorption (solvent
extraction) prior to GC analysis – for example following NIOSH and
OSHA reference methods – routine thermal desorption (TD) technology
was originally developed specifically for this application area. TD
overcomes the inherent analyte dilution limitation of solvent
extraction improving method detection limits by 2 or 3 orders of
magnitude and making methods easier to automate. Relevant
international standard methods include ISO 16017-1 and ISO 16017-2.
For a detailed history of the development of analytical thermal
desorption and a comparison with solvent extraction methods see Ref
5.5 In order to protect the environment
as a whole and human health in particular, it is often necessary to
take measurements of air quality and assess them in relation to
mandatory requirements.
5.6 The choices of sorbents, sampling method, and analytical methodology affect the efficiency of sorption, recovery, and quantification of individual VOCs. This practice is potentially effective for any GC-compatible vapor-phase organic compound found in air, over a wide range of volatilities and concentration levels. However, it is the responsibility of the user to ensure that the sampling, recovery, analysis, and overall quality control of each measurement are within acceptable limits for each specific VOC of interest. Guidance for this evaluation is part of the scope of this practice. |
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| 1. Scope | ||||||||||
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1.1 This practice is intended to assist in the selection of sorbents and procedures for the sampling and analysis of ambient 1.2 This practice is based on the sorption of VOCs from air onto selected sorbents or combinations of sorbents. Sampled air is either drawn through a tube containing one or a series of sorbents (pumped sampling) or allowed to diffuse, under controlled conditions, onto the sorbent surface at the sampling end of the tube (diffusive or passive sampling). The sorbed VOCs are subsequently recovered by thermal desorption and analyzed by capillary gas chromatography. 1.3 This practice applies to three basic types of samplers that are compatible with thermal desorption: (1.4 This practice recommends a number of sorbents that can be packed in sorbent tubes for use in the sampling of vapor-phase organic chemicals; including volatile and semi-volatile organic compounds which, generally speaking, boil in the range 0 to 400°C (v.p. 15 to 0.01 kPa at 25°C). 1.5 This practice can be used for the measurement of airborne vapors of these organic compounds over a wide concentration range. 1.5.1 With pumped sampling, this practice can be used for the speciated measurement of airborne vapors of VOCs in a concentration range of approximately 0.1 μg/m3 to 1 g/m3, for individual organic compounds in 1–10 L air samples. Quantitative measurements are possible when using validated procedures with appropriate quality control measures. 1.5.2 With axial diffusive sampling, this practice is valid for the speciated measurement of airborne vapors of volatile organic compounds in a concentration range of approximately 100 µg/m3 to 100 mg/m3 for individual organic compounds for an exposure time of 8 h or 1 µg/m3 to 1 mg/m3 for individual organic compounds for an exposure time of four weeks. 1.5.3 With radial diffusive sampling, this practice is valid for the measurement of airborne vapors of volatile organic compounds in a concentration range of approximately 5 µg/m3 to 5 mg/m3 for individual organic compounds for exposure times of one to six hours. 1.5.4 The upper limit of the useful range is almost always set by the linear dynamic range of the gas chromatograph column and detector, or by the sample splitting capability of the analytical instrumentation used. 1.5.5 The lower limit of the useful range depends on the noise level of the detector and on blank levels of analyte or interfering artifacts (or both) on the sorbent tubes. 1.6 This procedure can be used for personal and fixed location sampling. It cannot be used to measure instantaneous or short-term fluctuations in concentration. Alternative ‘grab sampling’ procedures using canister air samplers (for example, Test Method D5466) may be suitable for monitoring instantaneous or short term fluctuations in air concentration. Alternatives for on-site measurement include, but are not limited to, gas chromatography, real-time mass spectrometry detectors and infrared spectrometry. 1.7 The sampling method gives a time-weighted average result. 1.8 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.9 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. |
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| 2. Referenced Documents | ||||||||||
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