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General Spectroscopy - Nitrogen products for TOC analyzer

 
I’m looking for a Total Nitrogen reference standard. Could you tell me if in your product QCP-NUT-1 the "Nitrate plus nitrite amount + ammonium amount = Total Nitrogen", or could it be possible that there is a non-certified nitrogen type in the standard? I also have the same question about QCP-NUT-2; does "Total Kjeldahl Nitrogen = Total Nitrogen"? The method we are using is to analyze Total Nitrogen in water and wastewater with Shimadzu’s TOC analyzer coupled with a TNM-1 detector (it is a combustion/oxidation at 720°C method).
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Shimadzu’s Total Nitrogen Module, TNM-1, uses chemiluminescence to measure total nitrogen. Similar to the TOC analyzer, the TNM-1 is a non-specific measurement of total nitrogen. A nitrogen-based sample is combusted to nitrogen monoxide and nitrogen dioxide. The nitrogen species are then reacted with ozone to form an excited state of nitrogen dioxide. Upon returning to ground state, light energy is emitted. Then, total nitrogen (TN) is measured using a chemiluminescence detector. We have found that this approach will work for virtually any nitrogen functionality except the azides and triazides ( -N=N=N- functionality that compusts to N2 gas).  Any of our nitrogen CRMs will work including the NUT-I and NUT-2 products.  We have nitrogen as nitrate, nitrite, ammonium, amine, and Kjeldahl (amino acid).  All of these should work.

Posted: 09/04/18 19:26:22

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