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TABLE 6-1. Analytical Methods for Determining Lead in Biological Materials <br /> Sample <br /> detection Percent <br /> Sample matrix Preparation method Analytical method limit recovery Reference <br /> Blood Sample wet ashed with acid ASV with mercury- 40 µg/L 95-105 NIOSH 1977d <br /> mixtures; residue dissolved graphite electrode <br /> in dilute HC1O4 (NIOSH method <br /> P&CAM 195) <br /> Blood Sample wet ashed with HNO3; GFAAS (NIOSH method 100 ug/L NR NIOSH 1977g <br /> residue dissolved in P&CAM 214) rn <br /> dilute HNO3 a <br /> Z <br /> n <br /> r <br /> Blood Sample diluted with Triton GFAAS 2.4 µg/L 93-105 Aguilera et al. D <br /> X-IMP; nitric acid and 1989 <br /> diammonium phospate added ►� <br /> z <br /> Blood Dilute sample with ammonium ICP-MS 15 µg/L 96-111 Delves and <br /> solution containing Triton Campbell 1988 <br /> X-100; analyze <br /> Blood Dilute sample in 0.2% Triton GFAAS -15 ug/L 97-150 Que Hee et <br /> X-100 and water; analyze al. 1985a <br /> Blood and urine Urine sample mixed with HNO3; AAS (Method 0.05 µg/g 99 NIOSH 1984 <br /> filtered, whole blood or P&CAM 8003) (blood) or <br /> filtered urine chelated with 10 µg/mL <br /> APDC, and extracted with MIBK (urine) <br /> Blood and urine Sample wet ashed with HNO3, Spectrophotometry 30 pg/L 97 NIOSH 1977a <br /> complexed with diphenylthio- (NIOSH method (blood); 97 <br /> carbazone, and extracted with P&CAM 102) 12 µg/L <br /> chloroform (urine) <br />