Sequential injection method for automatically monitoring COD, ammoniacal nitrogen and pH value of water and its integrated equipment

A technology of sequential injection and automatic monitoring, applied in testing water, testing moving fluids/granular solids, instruments, etc., can solve the problems of different integration of automatic sewage monitoring systems, and achieve the effect of simple structure, wide measurement range and economical operation.

Inactive Publication Date: 2002-08-28
XI AN JIAOTONG UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Although the above-mentioned documents mentioned about sequential injection, chemical oxygen demand, ammonia nitrogen, pH value, spectrophotometry, etc., most of the documents mainly used the FIA ​​method. The determination of environmental pollution indicators, the selection of environm

Method used

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  • Sequential injection method for automatically monitoring COD, ammoniacal nitrogen and pH value of water and its integrated equipment
  • Sequential injection method for automatically monitoring COD, ammoniacal nitrogen and pH value of water and its integrated equipment
  • Sequential injection method for automatically monitoring COD, ammoniacal nitrogen and pH value of water and its integrated equipment

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Embodiment

[0062] Example: The method and device for simultaneous monitoring of the three indicators of COD, ammonia nitrogen and pH in environmental water quality completed in accordance with the above technical scheme, using the gradient ratio method to carry out the actual sample data results are as follows:

[0063] For COD, with 100mg / L COD solution as the standard, the test results for 50mg / L, 150mg / L, 200mg / L and 250mg / L COD solutions are: 48mg / L, 156mg / L, 203mg / L, 258mg / L.

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Abstract

The invention discloses a method and equipment for automatically monitoring the water quality by measuring COD, ammonia nitrogen and pH in water by using the sequential injection analysis (SIA). Based on SIA, COD is measured by using the combination of Ce oxidation process and stopped flow-SIA method; ammonia nitrogen is measured by using the SIA-indigo intensity method of blue light; pH is measured by using the spraying wall electrode method. The invention measures COD, ammonia nitrogen and pH at the same time by using the on-line SIA technique. The invention provides features of on-line monitoring, simple structure, good accuracy and repeatability.

Description

1. Technical Field [0001] The present invention relates to a monitoring method and equipment for environmental water quality, and further relates to an integrated device for a method for sequential injection and automatic monitoring of water quality COD, ammonia nitrogen and pH. [0002] A specific aspect of the present invention relates to a method for simultaneous online automatic monitoring of three pollution indicators COD, ammonia nitrogen and pH in surface water. It adopts sequential injection analysis (SIA) method, which is more suitable than general flow injection analysis (FIA). Simultaneous determination of multiple monitoring indicators. [0003] Another specific aspect of the present invention relates to the device of the above method, which controls a series of operations such as injection pump, multi-channel selection valve, wavelength switching of the detector, heater, over-standard alarm, data acquisition, processing and transmission through an industrial computer....

Claims

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Application Information

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IPC IPC(8): G01N21/85G01N33/18G01N35/00
Inventor 梁恒武亚艳申忠如
Owner XI AN JIAOTONG UNIV
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