Method and apparatus for testing flow injection ammonia nitrogen color comparison

Abstract

The invention relates to a flow injection ammonia nitrogen color matching detection method, belonging to analytical chemistry technical field, which comprises injecting release solution as dilute NaOH solution into a capillary pipeline system connected with a gas liquid separator, injecting quantitative water sample to flow and circulate along with the release liquid in the capillary pipeline system, releasing ammonia from the water sample at the deep groove of the gas liquid separator and penetrate a ventilated membrane to be absorbed by acid-base indicator receive solution of more acid in another capillary groove at another side of the membrane, to change the color of the acid-base indicator, and feeding the receive solution absorbed with ammonia into a flow-through cell of a chromometer, using the photoelectric colorimeter to test the change of translucent photoelectric voltage and calculating out the ammonia nitrogen density of the sample water. The invention further provides a relative device. The invention can realize online detection of ammonia and nitrogen contents of water or solution quickly and simply, with accurate and reliable detected data, which only needs 50ul-1ml water sample injected in one time, low agent consumption, low cost and safe agents.

Description

technical field [0001] The invention relates to a flow injection ammonia nitrogen colorimetric detection method, in particular to a flow injection ammonia nitrogen colorimetric detection method capable of analyzing or on-line monitoring the ammonia nitrogen content in water or solution, and belongs to the field of chemical analysis and water environment monitoring and analysis. Background technique [0002] Ammonia is non-ionic ammonia (NH 3 ) or ionic ammonia (NH 4 + ) form of nitrogen, when ammonia dissolves in water, part of the ammonia reacts with water to form ammonium ions, and part of it forms hydrated ammonia (non-ionic ammonia), so it is collectively called ammonia nitrogen. [0003] Ammonia is usually present in rivers, lakes and seas in nature as the decomposition product of nitrogen-containing organic matter. In an aerobic environment, ammonia in water can be converted into nitrite, and in an anaerobic environment, nitrite present in water is reduced to ammoni...

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Problems solved by technology

[0009] The purpose of the present invention is to provide a method for detecting ammonia nitrogen by flow injection with simple operation, fast and reliable, non-toxic reagents and low operating costs and a flow injection ammonia nitrogen detection device specially used for the method, so as to overcome the traditional Nessler reagent spectrophotometry , Salicylic acid-hypochlorite spectrophotometry, ammonia gas sensitive electrode method and other ammonia nitrogen detection methods have disadvantages such as cumbersome operation, toxic reagents or reagents that cannot be stored for a long time, and realize NH 3 Automatic online detection of -N

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