Answer:
The chronic daily intake is 0.0328608 mg/kg day
Explanation:
The CDI due to ingestion is equal to:
[tex]CDI=\frac{C*IR*ED*EF}{BW*AT}[/tex]
Where
C = concentration = 1 mg/L
IR = 2.3 L/day
ED = risk dying per year = 70 year
EF = number of days per year = 365 days
AT = average tenure time = 75 year
BW = weight of body = 65.4 kg
[tex]CDI=\frac{1*2.3*70*365}{65.4*365*75} =0.0328mg/kgd[/tex]
The ingestion rate is:
IR = 20/60 = 0.333 h/day
The CDI due to dermal contact is equal to:
[tex]CDI_{2} =\frac{1*1.69*9x10^{-6}*0.333*70*365 }{65.4*365*75}*0.8x10^{3} =5.41x10^{-5} mg/kgd[/tex]
The CDI due to inhalation is equal to:
[tex]CDI_{3} =\frac{0.001*0.471*70*365}{65.4*365*75} =6.7x10^{-6} mg/kgd[/tex]
The total is:
CDItotal = 0.0328 + 5.41x10⁻⁵ + 6.7x10⁻⁶ = 0.0328608 mg/kgday
