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Color changes in NO3 testkit

wedgee

By wedgee,
in New to the Marine Aquaria Hobby

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wedgee Newbie

wedgee

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Hmmm me abit puzzled by my Sera NO3 testkit (yah yah i know i shld change, but gotta use this up first...) After i test the water and read from the tube, it is just a very slight orangy-red color, but after i leave it on the table (without cap) for half an hour, the whole thingy turns bright red!!!

So do i take the first initial reading or the one half an hour later?!?! Issit because of the atmosphere nitrogen thats causing this to happen?

:blink::blink::blink:

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Tanzy Newbie

Tanzy

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Take the reading about one to three minutes after mixing. The colour change is due to oxidation and is inaccurate.

post-36-1093875548.jpg

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