Ntu's, ppm & gm/l ?
Promist
Could anyone tell me the correlation between ntu's ppm and gm/l. For
example if I had 50ppm how many ntu's and gm/l would that be?
Thanks
Bob at pro...@bestweb.com
KIM TAE HOON
What is the gm/l???
I think it would be mg/l.
If mg/l is right, 50ppm is 50mg/l...
William Wu
"Promist" <Pro...@bestweb.net> wrote:
: Could anyone tell me the correlation between ntu's ppm and gm/l. For
: example if I had 50ppm how many ntu's and gm/l would that be?
: Thanks
: Bob at pro...@bestweb.com
Depends on the molecular weight of your compound. ppm can be coverted to
M (devide by 6.022 x 10^22 and mutiply by 10^6) and then to g/l by
mutiplying my molecular weight.
--
William C. Wu <gan...@rahul.net> |"Our faults, dear Brutus, is not in
http://www.rahul.net/ganesha/ | the internet, but in ourselves."
Wayne Richardson
The NTU is the opacity (turbidity) produced by 1 ppm of silica in
water. Conversion of ppm (wt/wt) to g/l (wt/vol) requires the density
of the solution. Therefore,
g/l = ppm x density/1000
Regards,
Wayne
Dr. George O. Bizzigotti
On 1 Apr 1997 02:48:11 GMT, William Wu <gan...@rahul.net> wrote:
>"Promist" <Pro...@bestweb.net> wrote:
>: Could anyone tell me the correlation between ntu's ppm and gm/l. For
>: example if I had 50ppm how many ntu's and gm/l would that be?
>
>Depends on the molecular weight of your compound. ppm can be coverted to
>M (devide by 6.022 x 10^22 and mutiply by 10^6) and then to g/l by
>mutiplying my molecular weight.
>
There is some confusion with units such as "ppm," "ppb," "ppt," and
"percent." All can be on either a weight basis or a mole basis, so the
conversion given by William Wu may not necessarily be correct. In my
experience in the environmental business, ppm is almost always on a
weight basis, i.e., intechangable with mg/L. Thus, in an old
environmental impact statement or discharge permit, 50 ppm would most
likely be 0.05 g/L. This confusion is the reason why the units for
trace components should be given explicitly in mg/L, ug/L, g/L, etc.
More recent documents are more likely to use these explicit mass per
volume units.
Regards,
George
**********************************************************************
Dr. George O. Bizzigotti Telephone: (703) 610-2115
Mitretek Systems, Inc., MS Z310 Fax: (703) 610-1556
7525 Colshire Drive E-Mail: gbiz...@mitretek.org
McLean, VA 22102-7400
**********************************************************************
Dave Murto
Wayne Richardson wrote:
>
> On 1 Apr 1997 02:48:11 GMT, William Wu <gan...@rahul.net> wrote:
>
> >"Promist" <Pro...@bestweb.net> wrote:
> >: Could anyone tell me the correlation between ntu's ppm and gm/l. For
> >: example if I had 50ppm how many ntu's and gm/l would that be?
> >: Bob at pro...@bestweb.com
> >
> >Depends on the molecular weight of your compound. ppm can be coverted to
> >M (devide by 6.022 x 10^22 and mutiply by 10^6) and then to g/l by
> >mutiplying my molecular weight.
> >
> >William C. Wu <gan...@rahul.net> |"Our faults, dear Brutus, is not in
> >http://www.rahul.net/ganesha/ | the internet, but in ourselves."
> >
>
> The NTU is the opacity (turbidity) produced by 1 ppm of silica in
> water. Conversion of ppm (wt/wt) to g/l (wt/vol) requires the density
> of the solution. Therefore,
>
> g/l = ppm x density/1000
>
> Regards,
casually interchangeable when dealing with aqueous solutions because the
density of said solutions is close enough to 1, that weight and volume
of the solvent(water) is equivalent.
The NTU (Nephelometric Turbidity Unit) is an arbitrary scale of
turbidity that can't be related directly to the concentration of the
materials which produce it (suspended solids). It is defined according
to the reflected light produced by a suspension of a specific polymer
(Formazin) when made according to a specified recipe.
Wayne Richardson
On Thu, 03 Apr 1997 18:49:13 -0500, Dave Murto <"shortlab "@ ct.net>
wrote:
>Wayne Richardson wrote:
>>
>> On 1 Apr 1997 02:48:11 GMT, William Wu <gan...@rahul.net> wrote:
>>
>> >"Promist" <Pro...@bestweb.net> wrote:
>> The NTU is the opacity (turbidity) produced by 1 ppm of silica in
>> water. Conversion of ppm (wt/wt) to g/l (wt/vol) requires the density
>> of the solution. Therefore,
>> g/l = ppm x density/1000
>In the analytical testing industry the units of ppm and mg/l are
>casually interchangeable when dealing with aqueous solutions because the
>density of said solutions is close enough to 1, that weight and volume
>of the solvent(water) is equivalent.
Next time I pipet a cadmium nitrate at 1.9 g/cc, I'll keep the
interchangeability in mind! Therefore, 1 ml = 1 g. I don't think so.
We are a certified analytical testing facility and R&D laboratory.
Perhaps we are just not casual enough.
Regards,
Wayne
P.S. You also may want to check on the historical origin of the NTU.