[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: pH monitor tips....
- To: Aquatic-Plants at actwin_com
- Subject: Re: pH monitor tips....
- From: Paul Sears <psears at nrn1_NRCan.gc.ca>
- Date: Fri, 9 Aug 2002 19:54:26 -0400 (EDT)
- In-reply-to: <200208091948.g79Jm2E26508 at acme_actwin.com> from "Aquatic Plants Digest" at Aug 09, 2002 03:48:02 PM
> From: Dgrim62 at cs_com
> Subject: Subject: Re: pH Monitor Tips -- What? No Probing Puns?
> Gil (gillmannsf at cswebmail_com) said, in part:
> > . . . Today's monitors and probes have a
> > temperature sensor included in the probe and the
> > correction is done automatically, which is why we don't
> > need to worry about this factor.
> Wonder why the calibration fluids are marked for temperature. They
> were made for old (type) probes? They are old fluids? . . .
There is a distinction between temperature correction for the
_probe_ and the variability of the pH of the _buffer_ solution with
> I have a packet of American Marine pH 7.0 calibration fluid in front of me
> now. The correction table shows you that 77 deg. Farenheit you should adjust
> the monitor to 7.000. The difference in the correction values for higher
> temps (86 DF) is 6.988 or lower temps (68DF) is 7.016 and is so negligible
For our purposes, right.
Paul Sears Ottawa, Canada