June 07, 2020, 02:14:46 AM
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### Topic: Groundwater pollution  (Read 318 times)

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#### elifkorkmaz

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##### Groundwater pollution
« on: May 01, 2020, 06:24:02 AM »
an impoundment 7x4 m is contaminated by carbontetrachloride. The contaminated liquid comes in contact with the groundwater and a concentration gradient of 1.1x10-6 (mol/cm3)/cm is established. Use Fick’s law to determine the diffusive flux assuming diffusion is the only driving force. How many kilograms of carbontetrachloride will move toward the groundwater in one hour?

#### sjb

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##### Re: Groundwater pollution
« Reply #1 on: May 01, 2020, 09:21:24 AM »
an impoundment 7x4 m is contaminated by carbontetrachloride. The contaminated liquid comes in contact with the groundwater and a concentration gradient of 1.1x10-6 (mol/cm3)/cm is established. Use Fick’s law to determine the diffusive flux assuming diffusion is the only driving force. How many kilograms of carbontetrachloride will move toward the groundwater in one hour?

What have you tried?

#### elifkorkmaz

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##### Re: Groundwater pollution
« Reply #2 on: May 01, 2020, 10:29:39 AM »
I hav tried to find Diffusion coefficient and flux, but I couldnt find the movement in 1hour...

#### Corribus

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##### Re: Groundwater pollution
« Reply #3 on: May 01, 2020, 11:35:01 AM »
Without being given the diffusion constant, I don't see how to express an answer in absolute terms. However you can express it in terms of the diffusion constant. There is no way to calculate the diffusion constant from the information given. It is a characteristic property of the diffusant and diffusing medium. (You can determine D from the flux, or the flux from D. Both are unknowns here. So the best you can do is express the flux in terms of D, and then calculate the total mass moved - in terms of D - from the flux.)
What men are poets who can speak of Jupiter if he were like a man, but if he is an immense spinning sphere of methane and ammonia must be silent?  - Richard P. Feynman

#### elifkorkmaz

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##### Re: Groundwater pollution
« Reply #4 on: May 01, 2020, 12:50:25 PM »
I found flux by Fick's law, but how can ı find the movwmwnt of contaminant in 1hour?

#### Corribus

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##### Re: Groundwater pollution
« Reply #5 on: May 01, 2020, 01:39:15 PM »
What are the units of flux?
What men are poets who can speak of Jupiter if he were like a man, but if he is an immense spinning sphere of methane and ammonia must be silent?  - Richard P. Feynman

#### elifkorkmaz

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##### Re: Groundwater pollution
« Reply #6 on: May 01, 2020, 02:16:24 PM »
I found FİRSTLY D=5.06x10^-7 x T / μ x V^0.6
after that from fick's law ; -Dx (dc/dx)

#### Corribus

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##### Re: Groundwater pollution
« Reply #7 on: May 01, 2020, 02:22:49 PM »
Great work. Where did you find the diffusion constant?
What men are poets who can speak of Jupiter if he were like a man, but if he is an immense spinning sphere of methane and ammonia must be silent?  - Richard P. Feynman

#### elifkorkmaz

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##### Re: Groundwater pollution
« Reply #8 on: May 01, 2020, 02:29:14 PM »
where should ı use it?