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Jesse Handel, Scientist
Category: General
Satisfied Customers: 306
Experience:  B.S. Degree Chem. & Bact. 10 yrs tax preparation.
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# I would like to know how to figure parts per million in the

### Resolved Question:

I would like to know how to figure parts per million in the soil. I want to know by weight in pounds how much would 50 parts per million in soil weigh.
Submitted: 6 years ago.
Category: General
Expert:  Jesse Handel replied 6 years ago.

Parts per million in weight of soil simply means that there is 1 unit of weight of something in 1 million units of soil. Your example of 50 parts per million in soil, will mean that you have 0.00005 lbs of something in a pound of soil or 50 lbs of something in 1 million pounds of soil.

The EPA uses a liquid to remove chemicals from a gram of soil, then measures the amount of a specific chemical in the liquid and uses calculations to relate the concentration of the chemical in the liquid back to the weight of the original soil sample. If this is what you are interested in, tell me what chemical you want to know about and we can go through the calculations involved in this process.

Customer: replied 6 years ago.

I beleive that the soil needs between 10 and 50 ppm of Humic Acid. I would like to know how to figure that in order to convert that information into lbs. per acre of humic acid needed.

Expert:  Jesse Handel replied 6 years ago.

Hello againCustomer Thank you for the information. Since you are working with large quantities of composite materials (humic acid and soil), you don't need to worry about really precise calculations. You should just use 50 lbs of humic acid to 1 million lbs of soil. That will give you the ratio you need of 50/1,000,000 or 0.00005/1. To calculate the lbs of humic acid you need, take the pounds of soil in an acre, multiply by 50 and divide by 1 million. The result will be the pounds of humic acid to use for that weight of soil to get a 50 ppm concentration. The ration of 50 lbs to 1 million lbs is .00005, so you can just take the amount of soil in lbs, multiply by .00005, and get the lbs of humic acid. It's the same calculation as above, just in a simplified form. The basic calculation is Y lbs soil * (50 lbs humic acid divided by 1 million lbs soil) = Z lbs humic acid at 50 ppm.

Do you know the lbs of soil in an acre of land? Also, the lbs of soil in your acre will be dependent on how deep you plow and plant, because you have three dimensions to your acre (length, width, and depth). I can try to help you with that information if you need to figure it.

Jesse Handel, Scientist
Category: General
Satisfied Customers: 306
Experience: B.S. Degree Chem. & Bact. 10 yrs tax preparation.

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