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Method TO-10A Pesticides/PCBs <br /> n <br /> E (Ti X F) <br /> V = i - i <br /> Va 1000 L/m 3 <br /> where: <br /> Va= total volume of air sampled,m3. <br /> T;= length of sampling segment between flow checks,min. <br /> F;= average flow during sampling segment,L/min. <br /> 13.1.7 The air volume is corrected to EPA standard temperature(25'C)and standard pressure(760 mm Hg) <br /> as follows: <br /> Pb - PW 298K <br /> VS = Va 760 mm Hg to <br /> where: <br /> VS= volume of air at standard conditions(25'C and 760 mm Hg), std.m3. <br /> Va= total volume of air sampled,m3. <br /> Pb= average ambient barometric pressure,mm Hg. <br /> PW= vapor pressure of water at calibration temperature,mm Hg. <br /> to= average ambient temperature, °C+273. <br /> 13.1.8 If the proper criteria for a sample have been met,concentration of the compound in a standard cubic <br /> meter of air sampled is calculated as follows: <br /> C (ng/std. m3) _ (A) (100) <br /> a (VS) (SE(%)) <br /> where: <br /> SE= sampling efficiency as determined by the procedure outlined in Section 14. <br /> If it is desired to convert the air concentration value to parts per trillion (ppt) in dry air at standard <br /> temperature and pressure(STP),the following conversion is used: <br /> ppt=0.844(Ca) <br /> The air concentration can be converted to parts per trillion(v/v)in air at STP as follows: <br /> pptv _ (24.45) (Ca) <br /> (MW) <br /> where: <br /> MW— molecular weight of the compound of interest, g/g-mole. <br /> Page 10A-14 Compendium of Methodsjor Toxic Organic Air Pollutants January 1999 <br />