Average concentration of atrazine in the inflow water = 8.0 mg/L
Volume of reservoir = 3.0 x 105 m3
Total annual flow = 1.5 x 105 m3
Annual outflow due to evaporation =1.2 x 105 m3
Average concentration of atrazine in the outflow = 6.2 mg/L
Total quantity of atrazine added into the reservoir = 8.0 x 1.5 x 105 x 1000 mg = 1200 kg
As,the volume of the reservoir is steady, i.e. it is constant,
Outflow = Inflow – Evaporation loss
= (1.5 x 105 m3) - (1.2 x 105 m3)
= 0.3 x 105 m3
Total quantity of atrazine leaving the system = 6.2 mg/L x 0.3 x 105 m3 x 1000L/m3 = 186 kg
Total loss of atrazine by mass in the reservoir in the whole year = 1200 = 1014 kg
Internal Sink rate = 1014 kg/(3 x105 m3 x 365) = 9.26 mg/m3-day
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Solution
Average concentration of atrazine in the inflow water = 8.0 mg/L
Volume of reservoir = 3.0 x 105 m3
Total annual flow = 1.5 x 105 m3
Annual outflow due to evaporation =1.2 x 105 m3
Average concentration of atrazine in the outflow = 6.2 mg/L
Total quantity of atrazine added into the reservoir = 8.0 x 1.5 x 105 x 1000 mg = 1200 kg
As,the volume of the reservoir is steady, i.e. it is constant,
Outflow = Inflow – Evaporation loss
= (1.5 x 105 m3) - (1.2 x 105 m3)
= 0.3 x 105 m3
Total quantity of atrazine leaving the system = 6.2 mg/L x 0.3 x 105 m3 x 1000L/m3 = 186 kg
Total loss of atrazine by mass in the reservoir in the whole year = 1200 = 1014 kg
Internal Sink rate = 1014 kg/(3 x105 m3 x 365) = 9.26 mg/m3-day
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