RE: NANFA-- conversion factors

Nicholas J. Zarlinga (njz_at_clevelandmetroparks.com)
Wed, 6 Mar 2002 10:03:54 -0500

The 1.7 and .6 values are a good basis to go on, thanks. Unfortunately, in
this situation I was hoping to look for something a little more precise. I
am doing a NaCl treatment on an outdoor pond for fungus and parasites and
my refractometer is giving me mixed results. The Salinity meter is telling
me that the value of the water is 4.8mS. In a normal marine aquarium
situation where the concetration of salts in the water is variable, it is
not as important to be precise, however the concentration of salts in
freshwater is a bit more important to me since we are dealing with low
dissolved solids for a therapeutic dosage. The conversion table I have
reads from 19.3ppt to 40.2ppt and the conversion values are not linear,
making it difficult to extrapolate for a much lower dosage. Furthermore, I
am not sure that the values are calculateable at the extreme low end of the
spectrum. Any thoughts?

Nick Zarlinga
Aquarium Biologist
Cleveland Metroparks Zoo
216-661-6500 ex 4485

"Fish worship... is it wrong??" (Ray Troll)

On Tuesday, March 05, 2002 8:43 AM, EELReprah_at_aol.com
[SMTP:EELReprah_at_aol.com] wrote:
> In a message dated 3/5/02 7:49:00 AM, njz_at_clevelandmetroparks.com writes:
>
> << Can anyone tell me how to convert milliSiemens (mS) to parts per
thousand
> (ppt)?
> >>
>
> For normal type of dissolved solids I have found the conversion factor to
be
> 1.7 to convert microsiemens to parts per million. Since both are 1000
times
> the milli and per thousand it should be the same. So microsiemens is 1.7
> times the ppm or millisiemens is 1.7 times the ppt. It will vary,
depending
> on the nature of the salts involved. Pure potassium chloride solution is
2.0
> times conversion factor. It is often used for calibration of meters but
> doesn't really correspond to tap water.
>
> Lee Harper
>
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