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A CONII~REI-IE1NSIVE STUDY TO ADDRESS AIR TOXICS ISSUES <br /> <br />A comprehensive a/r toxics study should i~¢Iude pollutants from the following thr~ major <br />categories: VOCs; semivolatile orgmic compounds; and metals. The semivolatile organic <br />compounds and metals of concern are genera, y considered to be persistent and/or <br />bfoaccumulative and include such compounds as PCBs, dioxins and turms, polycyclic aromatic <br />}{ydrocafoons (PAIqs), hexa= md pentm:blombenzene, chromi,~ m~m~c, and m~. la. <br />addition, a complete study would include collecting ,mMenl: air and dc'~s~on samples. <br />Deposition monitoring would I/kely include collecting and analyz/ng pr~cip~on (~t wet <br />deposition) samples, and collecting and analyzing sed~r~er~ core samples (M~toricaI 4,~ on <br />aeposiUon). <br /> <br />Collecting samples' for each pollutant category requires rl~fterent equipment and methodologies. <br />For example, V0C samples ~: tTpically collected in Summa canisters. Semivolatile organic <br />compounds ar: typically collected with PUl: samplers or Hi-Vol (high volume) samplers <br />containing some type off,in cartridge to prevent volatflimtion of the pollutants. Pm'ticulate <br />metals am typically collected by high volume samplers drawing air across a filter with the <br />particles then being capt~d by the tilt. er material. <br /> <br />',~ addition to the d{~'emnt collection methodologies for each pollutant camgory, different <br />.aboratnry analysis methods are also required. The Air Qualit7 Laboratory can conduct some off <br />these analyses (Method T0-14 for VOCs), however, analysis of samples for diox~--ifurans, <br />PAHs, and pesticides requires a r~latively complicamd extraction and analysis process that would <br />likely need to be contracted o~ to another laboratory. Pa.~dculam metals can be analyzed by <br />several methods that require the barticles tn he extracted fi'om the filt~r and put into'solution for <br />'analysis (Inductively Coupled Argon Plasma and GTaphit: Furnace Atomic Absorption). The <br />concentration ofmet~!s on a filter can also he det~,-~,~r,ed by such non-d~ve means as X- <br />ray Fluorescence or Neutron Activa/ion Analysis. <br /> <br /> <br />