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

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....

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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 environmental pollution indicators, and the integration of automatic sewage monitoring systems are also different, and there are no domestic and foreign literature reports that the integrated system is used for online monitoring and simultaneous determination of COD, ammonia nitrogen, and pH indicators.

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