Polyurethane foam cartridge

Air (hazardous waste site) (2,3,7,8-TCDD) Collection of sample onto glass fiber filter/polyurethane foam cartridge add [37CI4]2,3,7,8-TCDD and [13C12]2,3,7,8-TCDD Soxhlet extraction with CH2CI2 clean-up with acid/base sequentially on silica gel, modified silica gel, alumina, and carbon HRGC/LRMS No data 0.02 pg/m3 91-112 74-112 Fairless et al. 1987 Harless et al. 1992... 

Air (CDDs) Collection of sample onto glass fiber filter/polyurethane foam cartridge addition of internal standard Soxhlet extraction with toluene volume reduction clean-up and fractionation on Florisil , elutiion with toluene/diethylether, evaporation and redissollution in cyclohexane clean-up on modified silica gel using HPLC and hexane/diethyl ether volume reduction HRGC/LRMS (EI/SIM) HRGC/LRMS (NCI/SIM) 0.1-1 pg/m3 0.2-3 pg/inj (0.01-0.1 pg/m3) 80-122 86-102 Oehme et al. 1986... 

Sample collected with low-volume sampler consisting of a constant flow pump and a cartridge containing polyurethane foam. Extract with diethyl ether in hexane. 

Zaranski, M.T., G.W. Patton, L.L. McConnell, T.F. Bidleman, and J.D. Mulik. 1991. Collection of nonpolar organic compounds from ambient air using polyurethane foam - granular adsorbent sandwich cartridges. Anal. Chem. 63 1228-1232. 

Most of the organochlorine pesticides listed in this chapter may be analyzed by NIOSH and U.S. EPA Methods (U.S. EPA 1984-1988, NIOSH, 1984-1989). The method of analysis, in general, involves drawing a measured volume of air through a sorbent cartridge containing polyurethane foam or Chromosorb 102. The pesticides are extracted with an organic solvent such as toluene, hexane, or diethyl ether the extract concentrated and analyzed by GC-ECD. The extract may be cleaned up by florisil to remove any interference (U.S. EPA Method 608). 

Recommended Method Airborne particles collected on a sorbent cartridge containing polyurethane foam extracted with 5% diethyl ether in hexane extract analyzed by GC-ECD recommended air flow 5 L/min sample volume 1000 L. 

The collection of PAHs from air for quantification requires special considerations. Some of the PAHs, especially those with lower molecular weights, exist primarily in the vapor phase while PAHs with higher molecular weights exist primarily in the particulate phase (Santodonato et al. 1981). Therefore, a combination of a particulate filter (usually glass-fiber filter) and an adsorbent cartridge (usually XAD-2 or polyurethane foam) is used for the collection of PAHs (Andersson et al. 1983 Harvath 1983 Hawthorne et al. 1993). Therefore, collection methods that use either a filtration system or an adsorbent alone may be incapable of collecting both particulate and vapor phase PAHs. In addition, a few PAHs are known to be susceptible to oxidation by ozone and other oxidants present in the air during the collection process (Santodonato et al. 1981). 

Patton G.W., McConnell L.L., Zaranski M.T. and Bidleman T.F. (1992) Laboratory evaluation of polyurethane foam-granular adsorbent sandwich cartridges for collecting chlorophenols from air. Anal. Chem., 64, 2858-2861. 

Figure 3 Minicartridges for use as personai sampiers for gases or vapors. (A) Charcoai or siiica gei tube for sampiing organic vapors 1, spring stopper 2, quartz wooi 3, glass tube 4, 20-40 mesh charcoal or silica gel (200 mg) 5, polyurethane foam plug. (Courtesy of Sibata Scientific Technology, used by permission.) (B) Sep-Pak cartridges. (Courtesy of Waters Corporation, Milford, MA, USA, used by permission.)...

FIGURE 15.27 (a) High-volume sampler for collection of semivolatile organic compounds from air (b) schematic diagram of air filter assembly containing quartz filter and polyurethane foam (PUF) cartridge (adapted from Reference 121). 

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