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**To**:**<Aquatic-Plants at actwin_com>****Subject**:**Re: nitrite-nitrogen vs. real nitrite?****From**:**"Slawomir Janicki" <janicki1 at earthlink_net>**- Date: Sun, 30 Apr 2000 17:27:58 -0500
- References: <200004301948.PAA08883 at actwin_com>

Well, I feel called to the board... The question is: How much nitrogen is in nitrite? Nitrite chemical formula is NO2-. Never mind the minus, the molecule consists of one nitrogen atom and two oxygen atoms. The mass of a nitrogen atom is roughly 14 Daltons (a unit of mass) and that of an oxygen is 16 Daltons. That makes the weight of nitrite 14+2*16=46. The % weight of nitrogen is 100% * 14/46= 30.4%. The inverse (1/30.4% = 3.29) gives you the conversion factor. The same way we can calculate factors for nitrate (weight 62, %N 22.6%, factor 4.43), ammonia (NH3, weight 17, %N 82.4%, factor 1.21), and ammonium ion (NH4+, weight 18, %N 77.8%, factor 1.29). HTH Slawomir Janicki janicki1 at earthlink_net > Date: Sun, 30 Apr 2000 08:48:32 -0400 > From: heinesen at idirect_ca > Subject: nitrite-nitrogen vs. real nitrite? > > My Tetra Laborett test kit makes the following statement about testing for > nitrite, and I am hoping someone more chemically-minded can explain it to me. > > <<<Bear in mind that the scale readings only give the nitrite-nitrogen > concentration. To obtain the real nitrite concentration, multiply the > value obtained from the test by 3.3>>> > > There are even two colour charts, one labelled "NO2-N" and the other just > "NO2-". The colours on the two charts are almost identical, but the > numbers are different, of course the numbers on the NO2- chart are 3 times > higher than those on the other chart. > > Could anyone please explain? > > Thanks! > Gitte >

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