Question

Предельно допустимая концентрация (ПДК) фенола в местах водопользования составляет 0,001 мг/л,рассчитайте во сколько раз концентрация фенола будет превышать ПДК,если в водоём вместимостью 104 кубических метра со сточными водами коксохимического предприятия было сброшено 47 кг фенола.

Answer 1

Объём водоёма = 104 м3 = 104000 л.
Масса фенола = 47 кг = 47000 г = 47000000 мг
Концентрация фенола = 470000000/104000 = 452 мг/л
превышение ПДК = 452/0,001 = 452000 раз.

Answer 2

Calculation of Phenol Concentration Exceeding the Maximum Permissible Concentration (MPC)

To calculate the concentration of phenol exceeding the Maximum Permissible Concentration (MPC), we need to consider the given MPC value and the amount of phenol discharged into the water body.

The given MPC for phenol in water bodies is 0.001 mg/L.

The amount of phenol discharged into the water body is 47 kg.

To calculate the concentration of phenol exceeding the MPC, we can use the following formula:

Concentration exceeding MPC = (Amount of phenol discharged) / (Volume of water body)

Given: - Amount of phenol discharged = 47 kg - Volume of water body = 104 cubic meters

Let's calculate the concentration exceeding the MPC:

Concentration exceeding MPC = (47,000 g) / (104,000 L)

Converting grams to milligrams and liters to cubic meters:

Concentration exceeding MPC = (47,000,000 mg) / (104,000,000 L)

Simplifying the expression:

Concentration exceeding MPC = 0.4519 mg/L

Therefore, the concentration of phenol will exceed the Maximum Permissible Concentration (MPC) by approximately 0.4519 mg/L.

Please note that the calculation assumes that the entire amount of phenol discharged is evenly distributed in the water body and does not take into account any dilution or dispersion effects.