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,:� l 1 C :S G .-• r �, <br /> .i W . .a V ' . . a V < - <br /> -^Ct <br /> .3iG a � "' ( � o., W r _ cc <br /> C C W '� <br /> rz = n n V z a' <br /> ,C., <br /> G C � P "r, N G =r<< . <br /> TABLE 6-2. Analytical Methods for Determining Lead in Environmental Samples <br /> Sample <br /> detection Percent <br /> Sample matrix Preparation method Analytical method limit recovery Reference <br /> Air Particulate matter collected GFAAS (Method 0.2 µg/m3 82-103 NIOSH 1990 <br /> (particulate lead) on membrane filter;wet P&CAM 7105) <br /> ashed with HNO3; diluted with <br /> distilled water <br /> Air Particulate matter collected ASV with mercury- 0.16 µg/m3 90-110 NIOSH 1977c <br /> (particulate lead) on membrane filter; wet graphite electrode <br /> ashed with HNO3/HC1O4/H2SO4; (Method P&CAM r <br /> dissolved in acetate buffer 191) <br /> Air Particulate matter collected AAS flame (Method 25 ug/m3 82-103 NIOSH 1984 > w <br /> (particulate lead) on membrane filter;wet ashed 7082) 3 <br /> with HNO3; aspirated into AA <br /> 0 <br /> unit voi <br /> Air Particulate matter collected ICP-AES (Method 5 Ig/M3 95-105 NIOSH 1984 <br /> (particulate lead) on cellulose acetate membrane P&CAM 7300) <br /> filter; wet ashed with <br /> HNO3/HC1O4 <br /> Air Particulate matter collected ICP-AES NR NR EPA 1988a <br /> (particulate lead) on filter; extracted with <br /> HNO31HCI, heat, and sonication <br /> Air Particulate matter collected AAS 0.1 µg/m3 93 Scott et al. <br /> (particulate lead) on filter; dry ashed; extracted AES 0.15 µg/m3 102 1976 <br /> with HNO3/HCI; diluted with <br /> HNO3 <br />