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Author: Subject: ppm to mg/l conversion? & expressing concentration by percentage
bluamine
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[*] posted on 29-3-2016 at 06:40
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??
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blogfast25
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[*] posted on 29-3-2016 at 06:55


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.




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bluamine
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[*] posted on 29-3-2016 at 10:31


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)
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feacetech
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[*] posted on 29-3-2016 at 19:20


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
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Ozone
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[*] posted on 29-3-2016 at 20:02


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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[*] posted on 29-3-2016 at 22:03


One quick thing to remember is:

0.1 % = 1000 ppm

gsd
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dhaffnersr
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[*] posted on 30-3-2016 at 15:30


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
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