A site containing two different soil types is contaminated with cadmium (Cd2+). Below is the adsorption isotherm data (at 25 oC, pH = 7.5) for each soil with Cd2+. Soil A Cw (mole/L) Cs (mole/kg) 0.30 4.36 0.50 5.33 1.00 6.40 2.90 7.37 Soil B Cw (mole/L) Cs (mole/kg) 1.00 1.00 1.20 1.09 2.00 1.33 3.50 1.56 What is the maximum adsorption capacity of each soil for Cd2+? Cs MAX for SOIL A Cs MAX for SOIL B Report your answers in units of moles Cd2+/ kg soil and enter them as X.X A soil pore water sample collected from a monitoring well measured Cw = 1.6 moles Cd2+/L. Calculate the Kd if this sample was collected from Soil
A site containing two different soil types is contaminated with cadmium (Cd2+). Below is the adsorption isotherm data (at 25 oC, pH = 7.5) for each soil with Cd2+.
|
Soil A |
|
|
Cw (mole/L) |
Cs (mole/kg) |
|
0.30 |
4.36 |
|
0.50 |
5.33 |
|
1.00 |
6.40 |
|
2.90 |
7.37 |
|
Soil B |
|
|
Cw (mole/L) |
Cs (mole/kg) |
|
1.00 |
1.00 |
|
1.20 |
1.09 |
|
2.00 |
1.33 |
|
3.50 |
1.56 |
What is the maximum adsorption capacity of each soil for Cd2+?
Cs MAX for SOIL A
Cs MAX for SOIL B
Report your answers in units of moles Cd2+/ kg soil and enter them as X.X
A soil pore water sample collected from a monitoring well measured Cw = 1.6 moles Cd2+/L.
Calculate the Kd if this sample was collected from Soil A and from Soil B.
Report your answer in units of L/kg and enter X.XXx10(-X) or X.XXx10(X)
To solve this problem, you need to find the relationship between KL and Kd (like we did in class for the relationship between KF and Kd.
Kd for SOIL A
Kd for SOIL B
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