[align=right][b]2025

[align=left]Substance [CAS No.]Documentation date:​)
Parathion [56-38-2] (2024
TWA: 0.05 mg/m3 (IFV)
STEL: Non
Notations: Skin; A3; BEIc
MW: 291.27
TLV® Basis: Cholinesterase inhib

BIOLOGICAL EXPOSURE DETERMINANTSParathion [56-38-2] (2019
Determinant: Total p-Nitrophenol in urine
Sampling Time: End of shift
BEI®: 0.5 mg/g creatinine
Notation: Ns
Determinant: Acetylcholinesterase activity in red blood cells
Sampling Time: End of shift
BEI®: 70% of individual’s baseline activity**
Notation: Ns[/