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Re: NO3 testing

> Date: Tue, 14 May 2002 23:11:47 +0200
> From: "Philippe Lemaire" <ph.lemaire at CompaqNet_be>
> Subject: NO3 testing
> 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...

Nitrate test kits do not measure nitrate directly.  The first step is to
reduce nitrate to nitrite.  It is the nitrite that actually forms the
color.  The 10-20 minute waiting period is to allow sufficient time for
the nitrate in your sample to be fully reduced.