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Bjorn Straube  wrote

>I'm going nuts!  I need to be able to convert between ppm NO3 and mg/l
>NO3.  I know I have the formula somewhere, but I'll be darned if I can
>find it at the moment.  Of course I'll find it the instant I am not
>looking for it! Well TIA.

Actually the conversion factor is 1 as 1ppm=1mg/L

Perhaps you were thinking of how to convert Nitrate-N to NO3 
which is   NO3 = 4.4* Nitrate-N