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�� TABLE 6-2 (Goni�nuacf) <br /> Sample <br /> detection Percent <br /> Sample matrix Preparation method Analytical method limit recovery Reference <br /> Air (particulate Particulate matter collected on XRF (particulate) 0.3 ug/m3 46->90 DeJonghe et al. <br /> and organolead) nucleopore filters; filtered GC/GFAAS (gaseous) 0.2 ng/m3 90-100 1981 <br /> gases cryogenically trapped and <br /> thermally desorbed <br /> Water (partic- Filtered through a 0.45-µm ICP-AES (EPA 42 ug/L 94-125 EPA 1983 <br /> ulate and membrane filter (dissolved method 200.7) <br /> a� <br /> dissolved lead) lead); filtered material <br /> dissolved by wet ashing (in- z <br /> soluble lead) <br /> Water (TAL) Sample extracted with hexane GC/AAS 0.5 µg/L 88-90 Chau et al. i <br /> 1979 <br /> Water (TAL) Purge sample; cryogenically GC/AAS 0.5 ng/g NR Chau et al. " <br /> trap on solid sorbent GC 1980 0 <br /> column <br /> Water (alkyl Sample complexed with diethyl- GC/AAS 1.25 ng/L 90-108 Chakraborti <br /> lead) dithiocarbamate;extracted et al. 1984 <br /> with pentane; dried; butylated; <br /> extracted with nonane <br /> Water Filtered through a 0.45-µm AAS (EPA 0.1 mg/L 99.8-125.7 EPA 1983 <br /> (particulate and membrane filter (dissolved Method 239.1) 88-95 <br /> dissolved lead) lead); filtered material GFAAS (EPA 1 µg/L <br /> dissolved by wet ashing (in- Method 239.2) <br /> soluble lead) <br /> Water (total Digest sample with acid; heat; AAS 1.0 ng/g NR Chau et al. 1979 <br /> lead) dilute with water <br />