What is the mass emission rate of copper in pounds per day from an industry discharging at a concentration of 5 mg/L?

To determine the mass emission rate of copper in pounds per day from an industry discharging at a concentration of 5 mg/L, it's important to understand the relationship between concentration, flow rate, and mass emission rate.

The mass emission rate can be calculated using the formula:

[ \text{Mass Emission Rate} = \text{Concentration} \times \text{Flow Rate} ]

Given the concentration of copper is 5 mg/L, this can be converted to pounds per day using relevant conversion factors.

First, we need to convert milligrams per liter (mg/L) to pounds per gallon because emissions are typically measured in pounds per day.

1. Conversion Factors:

• There are 0.00000220462 pounds in a milligram (since 1 pound = 453,592.37 mg).

• There are approximately 3.78541 liters in a gallon.

To make calculations simpler, we can combine the conversions:

[ 5 \text{ mg/L} = 5 \times 0.00000220462 \text{ lb/mg} = 0.0000110231 \text{ lb/L} ]

Next, to find the emission rate in