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 BENZIDINE in urine: METHOD 8304, Issue 2, dated 15 August 1993 - Page 4 of 4 Benzidine was not detected by TLC in any of the 14 urine specimens (LOD = 0.3 µg/100 mL).

EVALUATION METHOD: Ten spiked urine specimens containing 0.5 µg benzidine/100 mL urine each were analyzed. Precision, Sr, for the 10 specimens was 0.12.

REFERENCES: [1] NIOSH Manual of Analytical Methods, 2nd. ed., V. 5, P&CAM 315, U.S. Department of Health Education, and Welfare, Publ. (NIOSH) 79-141 (1979).

METHOD WRITTEN BY: William P. Tolos, NIOSH/DBBS.

NIOSH Manual of Analytical Methods (NMAM), Fourth Edition, 8/15/93