This page needs to be proofread.
BENZIDINE in urine: METHOD 8306, Issue 2, dated 15 August 1994 - Page 5 of 4 Anthony W. Smallwood, Karl E. DeBord, and Alex W. Teass, Ph.D., NIOSH/DBBS.
NIOSH Manual of Analytical Methods (NMAM), Fourth Edition, 8/15/94
