Re: Converting mg/L to ppm?

• To: Aquatic-Plants at actwin_com
• Subject: Re: Converting mg/L to ppm?
• From: Augustine J Rodriguez <rodrigaj at uwec_edu> (Augustine Rodriguez)
• Date: Sat, 20 Jul 1996 13:47:45 -1108

>From: tmarch at primenet_com (Todd March)
>Date: Fri, 19 Jul 1996 18:58:38 -0700
>Subject: Converting mg/L to ppm?
>
>Can anyone give me the formulas and explanations for converting mg/litre to
>ppm (parts per million)?
>Todd March
>tmarch at primenet_com

mg/L is approximately ppm.

The concentration of 0.001M (1mM) in ppm is equal to the number of grams
per mole (FW) of solute.  Where M = molarity in moles per litre and FW =
formula weight of solute in grams per mole.

Ex:  Given a 0.0189 M solution of NaCl.  What is the concentration of Na in
this solution in ppm?  Ans: 434.7 ppm.

0.0189 M x (23.0 ppm/.001M) = 434.7 ppm, since the FW of Na is 23 g per mole.

Augustine Rodriguez
Elk Mound, WI, USA

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