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Ammonia test method and device

A detection device and detection method technology, applied in the direction of material resistance, etc., can solve the problems of large water consumption of eluent and regeneration liquid, high price of cation chromatograph, difficulty in combination of acquisition system, etc., and achieve low overall cost and high source of material Rich, easy-to-collect effects

Inactive Publication Date: 2007-10-24
PEKING UNIV
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Problems solved by technology

[0002] At present, the commonly used method for measuring the concentration of ammonium ions in aqueous solution is to use ion chromatography. Ion chromatography has the advantages of rapidity, sensitivity, good selectivity and simultaneous determination of multiple components. The water consumption of liquid and regeneration liquid is large, and the calibration time is long; if online measurement is to be realized, it is difficult to combine with the acquisition system

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  • Ammonia test method and device

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Embodiment Construction

[0019] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0020] The method of the present invention utilizes in the aqueous solution of pH ≥ 12.3, utilizes in the aqueous solution of PH ≥ 12.3, the principle that the ammonium root can be completely converted into ammonia gas, reacts the ammonium root solution with a strong base to generate ammonia gas, and passes through the semi-permeable membrane The secondary water on the other side traps and absorbs the ammonia gas, and by measuring the change of the conductivity value after the secondary water absorbs the ammonia gas, the determination of the original ammonium root concentration derivatized is realized.

[0021] As shown in Fig. 1 and Fig. 2, the device of the present invention comprises a controllable incubator 1, and a detection module 2 is arranged in the incubator 1, and the detection module 2 includes an upper module 3 and a lower module 4 which ar...

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Abstract

The invention relates to an ammonia check method and a relative device, used in the water solution which pH is not lower than 12. 3. Based on the theory that all ammonia ions can be converted into ammonia gas, the invention reacts the ammonia ion solution with alkali to generate ammonia gas, uses the secondary water at another side of a semi-permeable membrane to catch and absorb the ammonia gas, and measures the conductivity change of the secondary water to realize the test on original ammonia ion density. The inventive device comprises a controllable constant-temperature box, a check module in the constant-temperature box, an electrode connected with the check module, a signal collector connected with the electrode, and a computer connected with the signal collector. The check module comprises upper and lower modules connected together via bolts. The invention is based on atmospheric environment, which can respectively measure the ammonia density of gas and aerosol, with the application in water condition and online measurement.

Description

technical field [0001] The invention relates to a detection method and a device, in particular to an ammonia detection method and a device which use the change of the conductance value of secondary water (deionized water) to derivate the original ammonium root concentration. Background technique [0002] At present, the commonly used method for measuring the concentration of ammonium ions in aqueous solution is to use ion chromatography. Ion chromatography has the advantages of fast, sensitive, good selectivity and simultaneous determination of multiple components. However, cation chromatography is expensive, bulky, and leaching The water consumption of liquid and regeneration liquid is large, and the calibration time is long; if online measurement is to be realized, it is difficult to combine with the acquisition system. Contents of the invention [0003] In view of the above problems, the object of the present invention is to provide an ammonia detection method and devic...

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Application Information

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IPC IPC(8): G01N27/06
Inventor 曾立民董华斌
Owner PEKING UNIV
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