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Author: Subject: ppm to mg/l conversion? & expressing concentration by percentage
bluamine
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ppm to mg/l conversion? & expressing concentration by percentage

Hi everyone!!
I need to convert concentration from ppm to mg/l. In addition i would like to know what's considered when we use percentage concentration mass or volume??
blogfast25
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 Quote: Originally posted by bluamine Hi everyone!! I need to convert concentration from ppm to mg/l. In addition i would like to know what's considered when we use percentage concentration mass or volume??

1 ppm = 1 part per million (all by weight).
1 mg/l = 1 mg per 1000 g (in the case of water) = 0.001 g per 1000 g = 1 ppm.

Percentages can be by volume or weight, resp. w% and V%. E.g. 5 w% = 5 g of solute per 100 g of solution.

bluamine
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Quote: Originally posted by blogfast25
 Quote: Originally posted by bluamine Hi everyone!! Percentages can be by volume or weight, resp. w% and V%. E.g. 5 w% = 5 g of solute per 100 g of solution.

Thank you for answering my first question.
About the second one i'm supposing that the percentage would be by weight if the solute was solid. otherwise it would be by volum!!e (especially when it comes to liquid solutes like acetic acid) but i'm not sure if it was a gaz (hydrochloric acid for exp)
feacetech
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mass never lies

the terms w/w or w/v tell you what type of percentage you are using

mg/L divided by 10000 yields percentage
Ozone
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ppm (ug/g, mg/kg, whatever) / 10000 = % w/w. 1E6 ppm = 100%. Stick with mass, and you'll be OK. Otherwise, be prepared to make many error propagating approximations (or measurements) of density for the sake of correction.

O3

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gsd
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One quick thing to remember is:

0.1 % = 1000 ppm

gsd
dhaffnersr
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Hey Bluamine, here is a niffty website that can make it easy;

http://www.lenntech.com/calculators/ppm/converter-parts-per-...

hope this helps have a good one!

Dave H

 Sciencemadness Discussion Board » Fundamentals » Beginnings » ppm to mg/l conversion? & expressing concentration by percentage Select A Forum Fundamentals   » Chemistry in General   » Organic Chemistry   » Reagents and Apparatus Acquisition   » Beginnings   » Responsible Practices   » Miscellaneous   » The Wiki Special topics   » Technochemistry   » Energetic Materials   » Biochemistry   » Radiochemistry   » Computational Models and Techniques   » Prepublication Non-chemistry   » Forum Matters   » Legal and Societal Issues