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NO3 testing

> Date: Tue, 14 May 2002 11:56:59 -0700
> From: Thomas Barr <tcbiii at earthlink_net>
> Subject: Re: mistake ref solution

> I left the ratio(for a 1 gram sample) and forgot to multiply by the 1.67
> grams in a 1/4 teaspoon. So it should read 1.020 grams of KNO3 and 0.646
> grams of K+ PER 1/4 TEASPOON.

> With the dilution that will give 10.2ppm of NO3 and K+ of 6.46 ppm in this
> reference sample.

> Thanks for pointing it out Ken.

> Regards, 
> Tom Barr    

Have you any idea of what is involved in this "10 min. waiting" when you use some tests ?
Mostly they go from lemon yellow to orange during this time, starting to get red thereafter...