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Is 1 ppb equal to 1 μg/kg?



Announcing the arrival of Valued Associate #679: Cesar Manara
Planned maintenance scheduled April 17/18, 2019 at 00:00UTC (8:00pm US/Eastern)How to determine the concentration after a dilution with Beer's law?What would be SMILES notation for a compound with delocalized bonding?Amount of substance of a molecule in a solute the same as amount of substance of constituent elements?Interpreting notation format 1.64E-02 from particulate emission dataWhat was the lithium concentration in 1940's 7-Up?Why are osmoles not considered SI units?Why is Ka constant when volume is increased?Should residual sodium be considered in measuring sodium content of sweat?Concentration of mercury in bodyConversion from a PPB value to µg/m3 of Isobutylene










2












$begingroup$


In an article I recently submitted, a reviewer asked that I provide a concentration in μg/kg instead of ppb (parts per billion), and mentions that the later is not correct. I am not a chemist, and I thought that 1 μg/kg = 1 ppb.



Is 1 ppb equal to 1 μg/kg ? What is a reason to consider ppb as incorrect ?










share|improve this question









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    2












    $begingroup$


    In an article I recently submitted, a reviewer asked that I provide a concentration in μg/kg instead of ppb (parts per billion), and mentions that the later is not correct. I am not a chemist, and I thought that 1 μg/kg = 1 ppb.



    Is 1 ppb equal to 1 μg/kg ? What is a reason to consider ppb as incorrect ?










    share|improve this question









    New contributor




    Nakx is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
    Check out our Code of Conduct.







    $endgroup$














      2












      2








      2





      $begingroup$


      In an article I recently submitted, a reviewer asked that I provide a concentration in μg/kg instead of ppb (parts per billion), and mentions that the later is not correct. I am not a chemist, and I thought that 1 μg/kg = 1 ppb.



      Is 1 ppb equal to 1 μg/kg ? What is a reason to consider ppb as incorrect ?










      share|improve this question









      New contributor




      Nakx is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.







      $endgroup$




      In an article I recently submitted, a reviewer asked that I provide a concentration in μg/kg instead of ppb (parts per billion), and mentions that the later is not correct. I am not a chemist, and I thought that 1 μg/kg = 1 ppb.



      Is 1 ppb equal to 1 μg/kg ? What is a reason to consider ppb as incorrect ?







      concentration notation units






      share|improve this question









      New contributor




      Nakx is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.











      share|improve this question









      New contributor




      Nakx is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.









      share|improve this question




      share|improve this question








      edited 2 hours ago









      andselisk

      19.2k662125




      19.2k662125






      New contributor




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      Check out our Code of Conduct.









      asked 2 hours ago









      NakxNakx

      1134




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      New contributor





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          1 Answer
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          $begingroup$

          You are correct suggesting that 1 μg/kg implies 1 ppb, however the reverse is not true. For instance, 1 ppb can also be 1 nmol/mol, and the reader will never have a chance to deduce which one is it unless you explicitly define the usage of the "parts per something" in the text.
          This clutters the manuscript with redundant notes and causes overall confusion.



          IUPAC also lists all similar symbols (ppm, ppt, ppb etc.) as deprecated; from IUPAC's “Green Book” [1, p. 98]:




          Although ppm, ppb, ppt and alike are widely used in various applications of
          analytical and environmental chemistry, it is suggested to abandon completely their use because of the ambiguities involved. These units are unnecessary and can be easily replaced by SI-compatible quantities such as pmol/mol (picomole per mole), which are unambiguous. The last column contains suggested replacements (similar replacements can be formulated as mg/g, μg/g, pg/g etc.).



          $$
          beginarraylllll
          hline
          textName & textSymbol & textValue & textExamples & textReplacement \
          hline
          ldots & & & & \
          textpart per billion & textppb & 10^-9 & textThe air quality standard for ozone is a & pummol/mol \
          & & & textvolume fraction of~varphi = 120~textppb & \
          ldots & & & & \
          hline
          endarray
          $$




          References



          1. IUPAC “Green Book” Quantities, Units, and Symbols in Physical Chemistry, 3rd ed.; Cohen, R. E., Mills, I., Eds.; IUPAC Recommendations; RSC Pub: Cambridge, UK, 2007. (PDF)





          share|improve this answer











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            2












            $begingroup$

            You are correct suggesting that 1 μg/kg implies 1 ppb, however the reverse is not true. For instance, 1 ppb can also be 1 nmol/mol, and the reader will never have a chance to deduce which one is it unless you explicitly define the usage of the "parts per something" in the text.
            This clutters the manuscript with redundant notes and causes overall confusion.



            IUPAC also lists all similar symbols (ppm, ppt, ppb etc.) as deprecated; from IUPAC's “Green Book” [1, p. 98]:




            Although ppm, ppb, ppt and alike are widely used in various applications of
            analytical and environmental chemistry, it is suggested to abandon completely their use because of the ambiguities involved. These units are unnecessary and can be easily replaced by SI-compatible quantities such as pmol/mol (picomole per mole), which are unambiguous. The last column contains suggested replacements (similar replacements can be formulated as mg/g, μg/g, pg/g etc.).



            $$
            beginarraylllll
            hline
            textName & textSymbol & textValue & textExamples & textReplacement \
            hline
            ldots & & & & \
            textpart per billion & textppb & 10^-9 & textThe air quality standard for ozone is a & pummol/mol \
            & & & textvolume fraction of~varphi = 120~textppb & \
            ldots & & & & \
            hline
            endarray
            $$




            References



            1. IUPAC “Green Book” Quantities, Units, and Symbols in Physical Chemistry, 3rd ed.; Cohen, R. E., Mills, I., Eds.; IUPAC Recommendations; RSC Pub: Cambridge, UK, 2007. (PDF)





            share|improve this answer











            $endgroup$

















              2












              $begingroup$

              You are correct suggesting that 1 μg/kg implies 1 ppb, however the reverse is not true. For instance, 1 ppb can also be 1 nmol/mol, and the reader will never have a chance to deduce which one is it unless you explicitly define the usage of the "parts per something" in the text.
              This clutters the manuscript with redundant notes and causes overall confusion.



              IUPAC also lists all similar symbols (ppm, ppt, ppb etc.) as deprecated; from IUPAC's “Green Book” [1, p. 98]:




              Although ppm, ppb, ppt and alike are widely used in various applications of
              analytical and environmental chemistry, it is suggested to abandon completely their use because of the ambiguities involved. These units are unnecessary and can be easily replaced by SI-compatible quantities such as pmol/mol (picomole per mole), which are unambiguous. The last column contains suggested replacements (similar replacements can be formulated as mg/g, μg/g, pg/g etc.).



              $$
              beginarraylllll
              hline
              textName & textSymbol & textValue & textExamples & textReplacement \
              hline
              ldots & & & & \
              textpart per billion & textppb & 10^-9 & textThe air quality standard for ozone is a & pummol/mol \
              & & & textvolume fraction of~varphi = 120~textppb & \
              ldots & & & & \
              hline
              endarray
              $$




              References



              1. IUPAC “Green Book” Quantities, Units, and Symbols in Physical Chemistry, 3rd ed.; Cohen, R. E., Mills, I., Eds.; IUPAC Recommendations; RSC Pub: Cambridge, UK, 2007. (PDF)





              share|improve this answer











              $endgroup$















                2












                2








                2





                $begingroup$

                You are correct suggesting that 1 μg/kg implies 1 ppb, however the reverse is not true. For instance, 1 ppb can also be 1 nmol/mol, and the reader will never have a chance to deduce which one is it unless you explicitly define the usage of the "parts per something" in the text.
                This clutters the manuscript with redundant notes and causes overall confusion.



                IUPAC also lists all similar symbols (ppm, ppt, ppb etc.) as deprecated; from IUPAC's “Green Book” [1, p. 98]:




                Although ppm, ppb, ppt and alike are widely used in various applications of
                analytical and environmental chemistry, it is suggested to abandon completely their use because of the ambiguities involved. These units are unnecessary and can be easily replaced by SI-compatible quantities such as pmol/mol (picomole per mole), which are unambiguous. The last column contains suggested replacements (similar replacements can be formulated as mg/g, μg/g, pg/g etc.).



                $$
                beginarraylllll
                hline
                textName & textSymbol & textValue & textExamples & textReplacement \
                hline
                ldots & & & & \
                textpart per billion & textppb & 10^-9 & textThe air quality standard for ozone is a & pummol/mol \
                & & & textvolume fraction of~varphi = 120~textppb & \
                ldots & & & & \
                hline
                endarray
                $$




                References



                1. IUPAC “Green Book” Quantities, Units, and Symbols in Physical Chemistry, 3rd ed.; Cohen, R. E., Mills, I., Eds.; IUPAC Recommendations; RSC Pub: Cambridge, UK, 2007. (PDF)





                share|improve this answer











                $endgroup$



                You are correct suggesting that 1 μg/kg implies 1 ppb, however the reverse is not true. For instance, 1 ppb can also be 1 nmol/mol, and the reader will never have a chance to deduce which one is it unless you explicitly define the usage of the "parts per something" in the text.
                This clutters the manuscript with redundant notes and causes overall confusion.



                IUPAC also lists all similar symbols (ppm, ppt, ppb etc.) as deprecated; from IUPAC's “Green Book” [1, p. 98]:




                Although ppm, ppb, ppt and alike are widely used in various applications of
                analytical and environmental chemistry, it is suggested to abandon completely their use because of the ambiguities involved. These units are unnecessary and can be easily replaced by SI-compatible quantities such as pmol/mol (picomole per mole), which are unambiguous. The last column contains suggested replacements (similar replacements can be formulated as mg/g, μg/g, pg/g etc.).



                $$
                beginarraylllll
                hline
                textName & textSymbol & textValue & textExamples & textReplacement \
                hline
                ldots & & & & \
                textpart per billion & textppb & 10^-9 & textThe air quality standard for ozone is a & pummol/mol \
                & & & textvolume fraction of~varphi = 120~textppb & \
                ldots & & & & \
                hline
                endarray
                $$




                References



                1. IUPAC “Green Book” Quantities, Units, and Symbols in Physical Chemistry, 3rd ed.; Cohen, R. E., Mills, I., Eds.; IUPAC Recommendations; RSC Pub: Cambridge, UK, 2007. (PDF)






                share|improve this answer














                share|improve this answer



                share|improve this answer








                edited 2 hours ago

























                answered 2 hours ago









                andseliskandselisk

                19.2k662125




                19.2k662125




















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