LaMotte Nitrate Test - The Planted Tank Forum
 
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post #1 of 3 (permalink) Old 01-12-2009, 07:44 PM Thread Starter
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LaMotte Nitrate Test

I recently purchased a LaMotte test kit to test the nitrate levels in my tank. I have not created a reference solution as yet so I cannot speak to it's accuracy. However, I do have a question about exactly what the test measures. I followed the process and according to the color scale the Nitrate level in my tank was 4 ppm. Here's where I get confused and unsure of myself. The instructions say that measurement is for N-NO3 and that I need to multiply that figure by 4.4 to get the reading for NO3.

So I'm looking for some confirmation from someone smarter than me. Based on the above, are my nitrates at 17.6 ppm (4 x 4.4)? Thanks!
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post #2 of 3 (permalink) Old 01-13-2009, 01:24 AM
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Yes.

The "standard" for many water biologists/chemists is to measure nitrate as mg N (as NO3) per liter (ppm N~NO3) - and similar units for ammonia and nitrite. Then the three numbers can be directly added for total N.

So since N only weighs 14g/mol and NO3 weighs 62g/mol, the ratio is 4.4 - the conversion factor from ppm N~NO3 to ppm NO3.

Kevin

Kevin

72g bowfront planted, CO2, 4x - T5HO, Eheim 2213 and 2217, 2 angels, pristella tetras, blue tetras, betta, albino bristlenose pleco, albino cories. Sword, vals, hygros, ludwigias, java moss and fern, anubias

2g Mac-quarium. Clown gravel, fluorescent plastic plants, and 2 guppies.
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post #3 of 3 (permalink) Old 01-13-2009, 02:19 AM Thread Starter
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Quote:
Originally Posted by KevinC View Post
Yes.

The "standard" for many water biologists/chemists is to measure nitrate as mg N (as NO3) per liter (ppm N~NO3) - and similar units for ammonia and nitrite. Then the three numbers can be directly added for total N.

So since N only weighs 14g/mol and NO3 weighs 62g/mol, the ratio is 4.4 - the conversion factor from ppm N~NO3 to ppm NO3.

Kevin
Thank you! I learned something today.
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