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Re: Aquatic Plants Digest V1 #257
> From: williaro at ftmcphsn-emh1_army.mil (Williams, Rochelle - DCSPIM)
> Date: Thu, 15 Feb 1996 09:25:27 -0500
> Subject: ppm -> degrees hardness
>
> Will someone post the conversion factors for parts per
> million (ppm) and German degrees hardness? None of
> my archive searches have produced results.
> ----------------------------------------------------------------------------
> ----------------
> Rochelle Williams williaro at ftmcphsn-emh1_army.mil
to convert parts per million (ppm) to German dH, multiply ppm by
.056. To get grains per US gallons (seldomly used) multiply ppm by
.058. To reverse the equation (in case you want ppm from German dH)
you divide German dH with .056.
Today's literature increasingly uses mole per cubic meter which
is already a norm in measuring water quality in Europe,and will no
doubt become a standard in North America, just as meters replaced
yards, kilos replaced pounds and Celsius replaced Fahrenheit......
(yeah right!). In case you come accross such measurement... Carbonate
hardness of 1 degree dH equals to 0.357 mols per cubic meter ( acid
capacity to pH 4.3). Total hardness of 1 dH = 0.179 mol/m3 (sum of
all earth alkalies).
Franc Gorenc franc at golden_net
Kitchener, Ontario http://www.golden.net/~franc
Canada