G - Physics – 01 – N
Patent
G - Physics
01
N
150/20
G01N 31/00 (2006.01) G01N 33/18 (2006.01)
Patent
CA 1115630
ANALYTICAL METHOD AND APPARATUS FOR THE DETERMINATION OF NITROGEN DERIVED FROM NITRITES OR NITRATES IN AQUEOUS SYSTEMS Abstract of the Disclosure The specification discloses an analytical method for the determination of nitrogen derived from nitrites or nitrates contained in aqueous systems, which comprises react- ing an aqueous solution containing nitrites or nitrates with an aqueous solution of sulfamic acid in a reactor which is provided in a carrier gas stream having substantially no nitrogen gas. In the case of a nitrates-containing aqueous solution, the solution is first subjected to a reduction of the nitrates into nitrites, then the nitrogen gas produced by the reaction is removed with the carrier gas, and the nitrogen gas is detected with a nitrogen gas detector. The specification also discloses apparatus for carrying out the method. In this way, nitrites or nitrates can be detected in extremely small quantities in water. The method is simple, inexpensive and very easy to carry out.
320395
Kirby Eades Gale Baker
Sumitomo Chemical Co. Ltd.
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