ASTM D5466-15
測(cè)定大氣中揮發(fā)性有機(jī)化合物的標(biāo)準(zhǔn)試驗(yàn)方法 (罐取樣法)

Standard Test Method for Determination of Volatile Organic Compounds in Atmospheres (Canister Sampling Methodology)

被代替

預(yù)覽 ASTM D5466-15前三頁

標(biāo)準(zhǔn)號(hào)

ASTM D5466-15

發(fā)布

2015年

總頁數(shù)

21頁

發(fā)布單位

美國材料與試驗(yàn)協(xié)會(huì)

替代標(biāo)準(zhǔn)

ASTM D5466-21

當(dāng)前最新

ASTM D5466-21

 

 

引用標(biāo)準(zhǔn)

ASTM D1356 ASTM D1357 ASTM E355

適用范圍

5.1 VOCs are emitted into ambient, indoor, and workplace air from many different sources. These VOCs are of interest for a variety of reasons including participation in atmospheric chemistry and acute or chronic human health impacts.

5.2 Canisters are particularly well suited for the collection and analysis of very volatile and volatile organic compounds. This test method describes the collection and analysis of whole gas samples and is not subject to high volatility limitations.

5.3 Chemically stable selected VOCs have been successfully collected in passivated stainless steel canisters. Collection of atmospheric samples in canisters provides for: (1) convenient integration of air samples over a specific time period (for example, 8 to 24 h), (2) remote sampling and central laboratory analysis, (3) ease of storing and shipping samples, (4) unattended sample collection, (5) analysis of samples from multiple sites with one analytical system, (6) dilution or additional sample concentration to keep the sample size introduced into the analytical instrument within the calibration range, (7) collection of sufficient sample volume to allow assessment of measurement precision through replicate analyses of the same sample by one or several analytical systems, and (8) sample collection using a vacuum regulator flow controller if electricity is not available.

5.4 Interior surfaces of the canisters may be treated by any of several proprietary passivation processes including an electropolishing process to remove or cover reactive metal sites on the interior surface of the vessel and a fused silica coating process.

5.5 For this standard, VOCs are defined as organic compounds that can be quantitatively recovered from the canisters having a vapor pressure greater than 10^-2 kPa at 25ºC and 760 mm Hg.

5.6 Target compound polarity is also a factor in compound recovery. Aliphatic and aromatic hydrocarbons from C1 to C13 have been successfully measured with this standard but are not listed in Table 1 (21). Higher polarity target compounds may interact with the canister surface or humidity on the canister surface causing their apparent vapor pressure to decrease. Polar VOCs such as ethers and esters have been successfully measured by this method and are listed in Table 1.

5.7 Recovery and stability studies shall be conducted on compounds not listed in Tab......

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