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.
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> 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