pH rainwater Watch

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Magix
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#1
Report 16 years ago
#1
Hi,

I am taking the pH of rainwater samples and have read that the conductivity of the pH buffers
and the rainwater samples should be the same before calibration and pH readings are taken. Why
is this so?

One way of making the conductivity the same is to add ionic strenght adjusters to the rainwater
samples, but how do I decide which one to use? I have looked at catalogues and they show different
types of ions.

Thanks! Kei
Trevorbastow
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#2
Report 16 years ago
#2
Hi Kei,

the conductivity of the rainwater and buffers don't need to be the same. You usually aim at having
the pH of the rain water with in the pH of the buffers- usually ph 4 to 7- as rainwater should be a
little acidic. The conductivity measures the salinity of the samples and by adding salts to the
rainwater you'll be changing the rainwater pH.

Cheers

Trevor

"Magix" <[email protected]> wrote in message news:<[email protected] t.com.sg>...
[q1]> Hi,[/q1]
[q1]>[/q1]
[q1]> I am taking the pH of rainwater samples and have read that the conductivity of the pH buffers and[/q1]
[q1]> the rainwater samples should be the same before calibration and pH readings are taken. Why is[/q1]
[q1]> this so?[/q1]
[q1]>[/q1]
[q1]> One way of making the conductivity the same is to add ionic strenght adjusters to the rainwater[/q1]
[q1]> samples, but how do I decide which one to use? I have looked at catalogues and they show different[/q1]
[q1]> types of ions.[/q1]
[q1]>[/q1]
[q1]> Thanks! Kei[/q1]
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