API Test Kits - The Planted Tank Forum
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post #1 of 7 (permalink) Old 12-22-2015, 12:23 AM Thread Starter
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API Test Kits

I have many API test Kits and they instruct you to put 5ml in the test tube. They instruct you to fill to the 5 ml white line. I have a scale that measures to the accuracy of 1/100th of a gram.
1 ml of water = 1 gram
Some of my test tubes will measure 5 ml or 5 grams at the white line on the test tubes.
But with some of the test tubes 5 ml or 5 grams is about a 1/8 to 3/16 above the white line.
My question is; If I only fill to the test tube white line, and there is only 4.7 ml in the test tube... Will the test be accurate?

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post #2 of 7 (permalink) Old 12-22-2015, 12:25 AM
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It is a hobby level test anyway, meant to give you a general ballpark of your readings. The tests aren't super accurate to begin with, so it shouldn't make a massive difference.

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post #3 of 7 (permalink) Old 12-22-2015, 12:26 AM
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Yeah, it's fine. People have complained to API before about their tubes, and the response was (I'm paraphrasing) "Meh, you're fine. Close enough." I think the volume is less important than the parameters of the water. Which is nice, because it makes it much easier to fill a tube (and not worry about getting it to the line).
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post #4 of 7 (permalink) Old 12-22-2015, 12:55 AM
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API's nitrate test kit uses 10 drops for 5ml water. I find the test solutions quickly run out. My "solution" is to use scale to get 2grams of water (2ml), and add 4 drops of test solution. I may use 1ml of water if I am desperate.
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post #5 of 7 (permalink) Old 12-22-2015, 01:04 AM Thread Starter
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I use seachem products so I think that I will switch to the sachem test kits. I was just reading on the sachem site that a if you use prime, and I do... API test kits drive up the PH which causes the ammonia that is bound up by prime, to be released and makes the test a false neg.

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post #6 of 7 (permalink) Old 12-22-2015, 01:27 AM
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I have reduced all of mine to a 1 drop test.
The only inaccuracy has been NH3.
If I move up to .8ml for a 1 drop test it is on spot.

Just thought I would share.

NO3 is very accurate @ .5ml per 1 drop.
NO2 is also very accurate. 1ml per 1 drop.
Ammonia is never consistant.


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Last edited by Maryland Guppy; 12-22-2015 at 01:31 AM. Reason: forgot
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post #7 of 7 (permalink) Old 12-22-2015, 01:44 AM
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Quote:
Originally Posted by Maryland Guppy View Post
Just thought I would share.
Thanks for sharing.

I have the API master kits for fresh water. My biggest complaint is that only 3~5 drops PH, high PH, nitrite test solutions are needed for full 5ml, and they last forever because I don't need to test those parameters very often, while 8~10 drops ammonia, nitrate solutions are needed for full 5ml, and I need to test, especially for nitrate, very often. API is doing this backwards.

Now I can do 1 drop tests.
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