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  • mg/L to ppm

    I am trying to convert a test result that is provided as mg/L to ppm. The specification requirement is 600 ppm (parts per million) and my test result is shown as 711 mg/L. If remember correctly the conversion is equivalent but I am not sure.

  • #2
    Re: mg/L to ppm

    Many resources you find show mg/L the same as ppm, but its not exactly true.

    Pure water at standard temperature and pressure has a density of 1 kg/L, therefore:

    mg/L = mg/kg = ppm

    But that is only true when using pure water at standard temperature and pressure. Any other substance will have a different density and will not be a direct conversion between mg/L and ppm.

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    • #3
      Re: mg/L to ppm

      Hi, for a solid-solid system, the conversion for ppm is mg/kg. For a solid-liquid system, the conversion is mg/L. For a gas-gas system, the conversion is uL/L.

      In a solid-liquid system you can calculate proportions easily, using dilution factors etc. As the liquid is effectively just a carrier, the density of the liquid is not usually important.

      In your system, 711mg/L is 711ppm, if it was measured at room temperature, or at some other specified temperature of interest.

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      • #4
        Re: mg/L to ppm

        i have a small conversion to make can you help to sort it out.

        i am adding 80 grams of color in one litre water and out of this i am using 50 ml to 40 kg mass

        i am adding 60 grams of color in 600 ml of water and out of this i aming using 4 ml to 40 kg same mass mentioned above.


        can you calculate and tell the total ppm of color in this 40 kg mass

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        • #5
          Re: mg/L to ppm

          Originally posted by Unregistered
          i have a small conversion to make can you help to sort it out.

          i am adding 80 grams of color in one litre water and out of this i am using 50 ml to 40 kg mass

          i am adding 60 grams of color in 600 ml of water and out of this i aming using 4 ml to 40 kg same mass mentioned above.


          can you calculate and tell the total ppm of color in this 40 kg mass
          This sounds like a home work question - I don't give answers for these, but will help you to work it out for yourself.

          For your first one, you are taking 50mL/1000mL x 80g. = weight A.

          Weight A x1000 = mg of weight A.

          this weight A (in mg) is going in to 40kg.

          Now work out how many mg of A is in each kg. That is your answer. (mg/kg = ppm)

          Have a go at the second one yourself. You are welcome to post back here if you would like your answers checked. Good luck with your studies.

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          • #6
            Re: mg/L to ppm

            Hai there im sorry but i am confused with your reply please see if i got it right

            I take 20 ml from a solution of 2.19g/100 ml so inorder to convert it to ppm 0r mg/kg

            it would be 20ml/(100ml*2.19gm) = 91.324 mg

            please do help me out as i cant find the answers to this any were else !

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            • #7
              Re: mg/L to ppm

              Originally posted by fuzik View Post
              Hai there im sorry but i am confused with your reply please see if i got it right

              I take 20 ml from a solution of 2.19g/100 ml so inorder to convert it to ppm 0r mg/kg

              it would be 20ml/(100ml*2.19gm) = 91.324 mg

              please do help me out as i cant find the answers to this any were else !
              Just making sure i understand what you are asking, you are taking 20mLof a solution, and you want to know what weight of the compound of interest you have?

              In 100mL you have 2.19g, in 20mL you have 20/100 of that.

              2.19g x (20/100) = 0.438g, or 438mg

              These are proportion calculations, so always work out what proportion you are taking. - In this case a fifth. Hope this helps, and good luck with your studies.

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              • #8
                Re: mg/L to ppm

                Honestly thank you very much i get it finally!

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                • #9
                  Re: mg/L to ppm

                  Okay i am sorry to bother you again its jut my supervisor is on a holiday

                  If i took .005 litres (5 mL) from a standard solution of 21900mg/1litre

                  Here 21900mg/1litre = 21900 ppm

                  but if i take out .005 ml from this i have 109.5 mg in it

                  is 109.5mg/.005ml also = 109.5 ppm? I would really appreciate it , thank you!

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                  • #10
                    Re: mg/L to ppm

                    Originally posted by Unregistered View Post
                    Okay i am sorry to bother you again its jut my supervisor is on a holiday

                    If i took .005 litres (5 mL) from a standard solution of 21900mg/1litre

                    Here 21900mg/1litre = 21900 ppm

                    but if i take out .005 ml from this i have 109.5 mg in it

                    is 109.5mg/.005ml also = 109.5 ppm? I would really appreciate it , thank you!
                    I believe you took out 0.005 L or 5 mL, not 0.005 mL. In any case the ppm value is a ratio and will NOT change if you take some stock solution (unless you also dilute it). 109.5 mg/0.005 L = 21900 ppm.

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                    • #11
                      Re: mg/L to ppm Conversion

                      Conversion for mg/L to ppm

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                      • #12
                        Re: mg/L to ppm

                        I am trying to test the salinity of soils for state regulations, post oil/produced water spills. New 2010 regulations restrict our former testing method

                        Typically we run into chloride concentrations of 10-20k mg/kg. We look for "clean" material with lab results of <200 mg/kg

                        I have a new probe I want to field test to get preliminary results.

                        Can I measure out a certain amount of soil (X grams) and certain amount of distilled water (X liters) and get a useable result?

                        Thank you

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                        • #13
                          Re: mg/L to ppm

                          ya dats coz 1ppm= 1mg/l and not 1mg/.005l.

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                          • #14
                            Re: mg/L to ppm

                            suppose the Cl =0.14mg/l after analysis with ion chromotography, can I say again Cl = 0.14ppm?

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                            • #15
                              Re: mg/L to ppm

                              I am trying to convert a test result that is provided as mg/L to ppm.

                              The specification requirement is 2000 ppm (parts per million) and my test result is shown as 708 mg/L.

                              If remember correctly the conversion is equivalent but I am not sure.[/QUOTE]

                              Comment

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