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Re: hardness
On Wed, 20 Sep 2000, Dave Gomberg wrote:
>
> On the subject of hardness, I have uncovered and tried to define the
> following terms:
Oh No! I think he's about to break the code!!
> Hardness: Ca+Mg
> General Hardness: Soap killing (tested by titration with "standard"
> soap solution)
Hardness = General Hardness = Total Hardness. Total Hardness
would actually be my preferred term.
> Permanent hardness: General hardness after boiling the water
Just "hardness" after boiling the water (and all the other details
in George S.'s recent description of the method).
> Temporary hardness: General hardness - Permanent hardness
> Carbonate content: Total CO3-- (and relatives) content
Not a standard term. For most water compositions you're talking
about bicarbonate concentration. Carbonate strictly speaking isn't
significant until we get to rather high pH levels -- 10 or so, I think.
> Alkalinity: Resistance to titration with an acid
or more briefly "buffer capacity".
> Carbonate hardness: Minimum of Hardness and Carbonate content (per
> Slusarczuk)
wasn't carbonate hardness=temporary hardness in George's writeup?
> KH: German for carbonate hardness?
I guess.
> Non-carbonate hardness: General hardness - Carbonate hardness????
In practice, Total hardness minus alkalinity, or 0, whichever is
greater.
>
> Does anyone disagree with any of these definitions????
No major differences.
Roger Miller