help with reading API test-Nitrites - Tropical Fish Keeping - Aquarium fish care and resources
 
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post #1 of 5 Old 04-11-2011, 04:52 PM Thread Starter
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help with reading API test-Nitrites


The results of my nitrite test do not show the "sky blue" that indicates no nitrates, but it has no purple in it either. Is the blue on the card a bit off from the liquid, because I don't know how to read this. I'm hoping I have no nitrites, but the blue color is a bit different than the card color.

Any ideas?

Gwen

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post #2 of 5 Old 04-11-2011, 04:59 PM
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Gwen, make sure you hold the tube against the card, and view it in daylight if possible. Artificial lights often distort various colours according to their spectrum/kelvin.

As long as the tube water is ot darker than the card for zero, you're OK.

Byron Hosking, BMus, MA
Vancouver, BC, Canada

The aquarist is one who must learn the ways of the biologist, the chemist, and the veterinarian. [unknown source]

Something we all need to remember: The fish you've acquired was quite happy not being owned by you, minding its own business. If you’re going to take it under your wing then you’re responsible for it. Every aspect of its life is under your control, from water quality and temperature to swimming space. [Nathan Hill in PFK]
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post #3 of 5 Old 04-11-2011, 05:11 PM Thread Starter
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Quote:
Originally Posted by Byron View Post
Gwen, make sure you hold the tube against the card, and view it in daylight if possible. Artificial lights often distort various colours according to their spectrum/kelvin.

As long as the tube water is ot darker than the card for zero, you're OK.
I did hold it up to natural light, and ran the test twice. I guess since it is darker than the card, I still have a trace of nitrites, but not up to .025 - almost there!!

Thanks

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post #4 of 5 Old 04-11-2011, 05:21 PM
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Originally Posted by GwenInNM View Post
I did hold it up to natural light, and ran the test twice. I guess since it is darker than the card, I still have a trace of nitrites, but not up to .025 - almost there!!

Thanks
Could be. I've forgotten from the last time i did a nitrite test, was years ago... You were careful about the number of drops? I have had an additional drop slip out in pH tests, and of course that makes the test useless. You also need to hold the regent bottle vertical so the drop is the right size. Pardon me if this is all known...but it can vary the results a lot.

Byron Hosking, BMus, MA
Vancouver, BC, Canada

The aquarist is one who must learn the ways of the biologist, the chemist, and the veterinarian. [unknown source]

Something we all need to remember: The fish you've acquired was quite happy not being owned by you, minding its own business. If you’re going to take it under your wing then you’re responsible for it. Every aspect of its life is under your control, from water quality and temperature to swimming space. [Nathan Hill in PFK]
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post #5 of 5 Old 04-12-2011, 10:44 PM
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Actually I always have this problem but I always figured it was just the lighting. I have a hard time matching pH even and a lot of times it looks like a color somewhere in between what's on the card. Nitrite readings for me are always differnt looking from the 0 color on the card but I figure as long as there's no trace of purple in it then it must match the 0. Sometimes what I do--and I don't know if you're even supposed to do this--but I lay the card down flat on a table and stand the tube up and look at it at eye level and somehow the colors match up easier. Again, not sure if you're supposed to do this "quirk" due to possible inaccuracy so I'm not recommending it lol but that's what I do a lot.
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