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Re:Re: Fish load .v. plant load


Before I received your reply I found something called "Molecular Weight
Calculator" which is freeware (under the calculators section) at www.nonags.
com.  If you select "view - single window" & "view - % solver - On" & then
enter a formula it gives you the % of each element in the compound.  It also
does lots more that I am sure is useful.


>Date: Thu, 20 Jan 2000 14:35:02 -0500 (est)
>From: "Roger S. Miller" <rgrmill at rt66_com>
>Subject: Re: Fish load .v. plant load>
>On Thu, 20 Jan 2000, Kevin Buckley wrote:
>> In your response you
>> make the throwaway comment "... 1.6 mg/liter N.  That would be about 7
>> of nitrate."  How do you (is it possible to?) calculate the amount of
>> Nitrogen in xxxNO3?  Is it calculated using the atomic weights of
Nitrogen &
>> Oxygen in some way?  What's the general principle?
>The idea is to determine the amount of nitrate that would be needed to
>contain the amount of nitrogen that's present.
>Nitrate has a molecular weight of 62 grams/mole (from 3 oxyen atoms at 16
>grams/mole each and one nitrogen at at 14 grams/mole).  The ratio between
>the weight of one mole of nitrate and one mole of nitrogen is 62/14, or
>about 4.4.
>So to convert nitrogen to the equivalent amount of nitrate, mulitply the
>nitrogen concentration by 4.4.
>It's common in water analyses to report all of the nitrogen species as the
>equivalent amount of nitrogen; that is, they often report NO3-N, NO2-N and
>NH3-N instead of NO3, NO2 and NH3.  That lets you compare results without
>doing any conversions.
>Roger Miller