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  • ppb to ug/l

    Does anyone know if there is a way to convert ppb to ug/l?

  • #2
    Re: ppb to ug/l

    For liquid solutions, they are the same, so no conversion will be necessary.

    ppm = mg/L
    ppb = ug/L

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    • #3
      Re: ppb to ug/l

      the new standard for arsenic in drinking water, mandated by the safe drinking water act, requires that by january 2006, public water suplies must contain no greater than 10 parts per billion (ppb) arsenic. assuming that this arsenic is present as arsenate, what ,*** of sodium arsenate would be present in a 1.00L sample of drinking water that just meets the standard?

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      • #4
        Re: ppb to ug/l

        Originally posted by Unregistered
        the new standard for arsenic in drinking water, mandated by the safe drinking water act, requires that by january 2006, public water suplies must contain no greater than 10 parts per billion (ppb) arsenic. assuming that this arsenic is present as arsenate, what ,*** of sodium arsenate would be present in a 1.00L sample of drinking water that just meets the standard?
        10 ppb of arsenic is 10 g/L equivalent elemental arsenic.
        If present as arsenate AsO4 (which has a valence of -3), the arsenate ion has a molar mass of 138.919 g/mol vs 74.922 g/mol for As alone, so 18.5 g/L of AsO4 ion.

        Since it is dissolved, and dissociated, there is no assurance it is teamed up with sodium. Also, there is trisodium arsenate and disodium hydrogen arsenate, etc. so I think there is no good answer to that part of your question. If you can determine exactly which form, and the appropriate molar mass, you can ratio it to arsenate as above.

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        • #5
          Re: ppb to ug/l

          if the solvent not water should not same ??

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          • #6
            Re: ppb to ug/l

            Originally posted by Unregistered View Post
            the new standard for arsenic in drinking water, mandated by the safe drinking water act, requires that by january 2006, public water suplies must contain no greater than 10 parts per billion (ppb) arsenic. assuming that this arsenic is present as arsenate, what ,*** of sodium arsenate would be present in a 1.00L sample of drinking water that just meets the standard?
            Hi
            You know is same the contain to Lead? its relative to Prosp. #65 California

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            • #7
              Re: ppb to ug/l

              Originally posted by Unregistered View Post
              Hi
              You know is same the contain to Lead? its relative to Prosp. #65 California
              What does this document state regarding lead? - I don't have access to it obviously, some of the others may not either. Google is not much help, it doesn't give the list of limits for each material under consideration, it just states the guidelines or parameters for consideration.

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              • #8
                Re: ppb to ug/l

                Prop. 65 says everything in California causes cancer.

                It does not consider safe or unsafe limits. If massive overdoses cause cancer in rats, then unmeasurably small quantities cause cancer in humans. By warning of unreal risks, it obscures real risks, because they are all the same. Exposure is ignored. Also things with rather flimsy evidence of causing cancer in rats get on the list.

                (obviously a rather political opinion, but evidence-based)

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                • #9
                  ppb conversion

                  Dear Sir,

                  one ppb means 1ng/l. Can we say also one ppb is equal to 1ng/g in mass basis.

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                  • #10
                    Re: ppb conversion

                    Originally posted by Unregistered View Post
                    Dear Sir,

                    one ppb means 1ng/l. Can we say also one ppb is equal to 1ng/g in mass basis.
                    1 ppb doesn't mean 1 ng/L, at least for liquids. Since 1 L of water is 1 kg, 1 ppb is 1 g/kg (w/w)or 1 g/L (w/v). The weight over volume method assumes 1 L is 1 kg whether it is or not.

                    If you found a gas that was had a mass of 1 g/L, then 1 ppb w/w might be 1 ng/L but mixed units like that are not normally used for gases

                    Parts per million, billion, etc are ambiguous because they can be a ratio of masses, volumes, moles of substance or mixed such as mass/volume. If the basis isn't stated, the term either has no meaning or four values depending on your perspective.

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                    • #11
                      Re: ppb to ug/l

                      How do you convert the TTHM results for drinking water from ug/L to ppb?

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                      • #12
                        Re: ppb to ug/l

                        Originally posted by Unregistered View Post
                        How do you convert the TTHM results for drinking water from ug/L to ppb?
                        I multiply by 1. See posts #2, #4, or some of the others.

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                        • #13
                          Re: ppb to ug/l

                          So is ppb=ug/L basically?

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                          • #14
                            Re: ppb to ug/l

                            Originally posted by Unregistered View Post
                            So is ppb=ug/L basically?
                            Yes, a liter of water is almost exactly 1 kg, kilograms and micrograms are 10^9 (one billion) apart.

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                            • #15
                              Re: ppb to ug/l

                              How many ppb is 0.09 ug/L?

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