Question

a farm worker is exposed to trifluralin, a commonly used pesticides while working in the fields. Calculate the risk of the worker exposed to 0.01mg/m³ who works 8 hours per day, 7 weeks, for 4 months a year, and for 25 years. Assume a body weight of 70kg and an inhalation volume of 20m³ per 8 hours. The slope factor for Trifluralin is 8.4*10^-1 (mh/kg.day)^-1

Answer 1

ADD$=\frac{C×InhR×ET×EF×ED}{Bw×AT}$

$C=0.01mg/m^3$

$InhR=20m^3/8hour$

$=2.5m^3/hour$

$ET=8hours/day$

$EF=7$ weeks, for $4$ months a year

$=49days/year$

$ED=25years\\ Bw=70kg\\AT=70years$

$=70×365$

$=25550days$

ADD$=\frac{0.01×2.5×8×49×25}{70×25550}$

$=1.370×10^{-4}(mg/kg-day)$

Risk$=$ slope factor $×$ ADD

$=1.370×10^{-4}×8.4×10^{-1}$

$=1.151×10^{-4}$