2. Collect urine at the end of a work shift in 125-mL polyethylene bottles containing 0.2 mL conc.
HNO3; mix. Submit a 25-mL aliquot for lead analysis and another 25-mL aliquot for creatinine
determination.
SAMPLE PREPARATION:
3. Filter urine samples before analysis. Analyze a 25-mL aliquot for creatinine by standard procedures
(e.g., [6]).
4. Place 2.0 mL filtered urine or 2.0 g whole blood in a 16 x 150-mm culture tube. Start a reagent
blank at this point with 2 mL deionized water.
5. Add 0.8 mL APDC-surfactant solution. Cap and mix on a rotary vibration mixer for 10 sec.
6. Add 2.00 mL water-saturated MIBK. Cap and rotate on a rotary vibration mixer for 2 min.
Centrifuge at 2000 rpm for 10 min. Analyze the Pb-APDC solution in MIBK within 2 h of extraction