pH calibration question

pH calibration question

Post by Dennis Rya » Thu, 14 Sep 2000 08:47:13



Hello everyone.

I contacted the vendor regarding this, but since many of you have
undoubtedly done this I thought I might run it by you. Be gentle if this
is too off topic.

What is the procedure for mixing the buffering solutions for the pH
calibrations? The solutions that came with my meter (omega PHH-3) are in
a capsule form. I assume that I will need to disolve them in some
distilled water. does the amount matter, 4-5 ml's ?

Thanks, Dennis

 
 
 

pH calibration question

Post by David Reec » Thu, 14 Sep 2000 09:33:02


Dennis,

I got the capsules with my meter too, and didn't mess with them. I went
and got the buffer solutions (pH 4.01 and pH 7.01) from the local
winemaker's store. That way, I didn't***anything up mixing up the
solution.

When the buffering solutions need to be replaced, I may consider mixing
my own up, but for now, it works just fine for me.

David Reece

Quote:

> Hello everyone.

> I contacted the vendor regarding this, but since many of you have
> undoubtedly done this I thought I might run it by you. Be gentle if this
> is too off topic.

> What is the procedure for mixing the buffering solutions for the pH
> calibrations? The solutions that came with my meter (omega PHH-3) are in
> a capsule form. I assume that I will need to disolve them in some
> distilled water. does the amount matter, 4-5 ml's ?

> Thanks, Dennis


 
 
 

pH calibration question

Post by joe_sa.. » Thu, 14 Sep 2000 22:21:33


Dennis
Not off topic at all, an uncalibrated pH meter is worse than useless,
since the user will make decisions based on uncertain measurements.

The capsules may be Hydrion brand; orange is 4.00, green is pH 7.00,
blue is pH 10.00.  If so, you add a capsule to 100 ml of distilled
water.  They have a preservative solution also, the buffers can keep
for up to 3 months when that is used.  I get them from Fisher
Scientific.  The Omega catalog I have looks like they get them from
Hydrion too, based on the litmus papers they show.

They are very cost effective and are stable.

I can email you a FAQ for pH meters if you would like.

Regards
Joe



Quote:
> Hello everyone.

> I contacted the vendor regarding this, but since many of you have
> undoubtedly done this I thought I might run it by you. Be gentle if
this
> is too off topic.

> What is the procedure for mixing the buffering solutions for the pH
> calibrations? The solutions that came with my meter (omega PHH-3) are
in
> a capsule form. I assume that I will need to disolve them in some
> distilled water. does the amount matter, 4-5 ml's ?

> Thanks, Dennis

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