Online simultaneous monitoring sensor and online simultaneous monitoring method for COD (Chemical Oxygen Demand) and nitrogen content of nitrate

A nitrate nitrogen, sensor technology, applied in the field of sensors, can solve the problems of secondary pollution, poor stability, poor integration, etc., and achieve the effects of no need for preheating, improved performance, and increased wavelength range

Inactive Publication Date: 2015-09-02
能讯传感技术(上海)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The object of the present invention is to provide a multi-parameter online simultaneous monitoring sensor and method for COD and nitrate nitrogen content to overcome the existing COD and nitrate nitrogen monitoring methods with complex operation, poor stability, long time consumption, poor integration, and secondary Pollution and other shortcomings, the sensor provided by the present invention adopts the ultraviolet absorbance method to integrate the determination of COD and nitrate nitrogen content on one probe, and the COD and nitrate nitrogen content can be measured simultaneously through one probe, and the operation is simple, the stability is high, Rapid determination, high integration, no secondary pollution, and wide application prospects

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  • Online simultaneous monitoring sensor and online simultaneous monitoring method for COD (Chemical Oxygen Demand) and nitrogen content of nitrate
  • Online simultaneous monitoring sensor and online simultaneous monitoring method for COD (Chemical Oxygen Demand) and nitrogen content of nitrate
  • Online simultaneous monitoring sensor and online simultaneous monitoring method for COD (Chemical Oxygen Demand) and nitrogen content of nitrate

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Embodiment 1

[0064] like figure 1 Shown: chemical oxygen demand provided by the present invention, nitrate nitrogen content multi-parameter online simultaneous monitoring sensor mainly is made up of following five parts: (one) light source module (ultraviolet light source-miniature deuterium lamp 2); (two) signal Acquisition and transmission module (waterproof connector 1, multi-channel signal acquisition circuit board 3, 1# photosensitive tube 4, 2# photosensitive tube 5, 3# photosensitive tube 6); (3) optical fiber module (refer to optical fiber 11, 254nm bandpass filter Light sheet 8, 210nm bandpass filter 7, 1# signal fiber 9, 2# signal fiber 10, light source fiber 12); (4) detection probe module (detection probe 14), the above four modules are all encapsulated in a stainless steel shell In 14, optical signals are transmitted through optical fibers, and electrical signals are transmitted through shielded cables. The mini deuterium lamp 2 (200nm-400nm) is coupled together with the lig...

Embodiment 2

[0078] The optical fiber module and detection probe of the present invention are specially designed so that the sensor can simultaneously measure two parameters of COD and chemical oxygen demand with one probe.

[0079] Fiber design such as figure 2 As shown, the optical fiber terminal 16 at the light source end has 4 cores, and three of them have a diameter of 400 μm, that is, the light source fiber 12. The light source fiber connects the light source end and the detection probe end, and provides an ultraviolet light source for the detection probe. The optical fiber 11 is connected to the reference optical terminal 17 to indicate whether the light source is working normally; the detection probe end optical fiber terminal 19 is 9 cores, and the diameter is 400 μm, three of which (being the light source optical fiber 12) are connected with the light source optical fiber terminal 16, and three ( That is, the 1# signal optical fiber 9) is connected to the 1# signal optical termin...

Embodiment 3

[0082] The application method of a multi-parameter online monitoring sensor for chemical oxygen demand and nitrate nitrogen content in actual water body detection in this embodiment. Proceed as follows:

[0083] Step 1: Calibrate the sensor

[0084] (1) Prepare 10 standard water samples with different chemical oxygen demand in beakers as samples to be tested (concentration range 0.50mg / L)

[0085](2) Measure the 10 samples respectively by using the standard chemical oxygen demand measurement method and instrument, and obtain the standard value of the chemical oxygen demand of the samples.

[0086] (3) Sensor of the present invention is inserted in 10 sample solutions respectively, power-on test, record the absorbance value that 1# photosensitive tube 4 records, and it and sample chemical oxygen demand standard value fitting establish linear relationship, as Figure 4 As shown, the correction formula Y is obtained 1 =358.50966*X 1 -31.85428, the complex correlation coeffici...

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Abstract

The invention relates to an online simultaneous monitoring sensor and an online simultaneous monitoring method for COD (Chemical Oxygen Demand) and nitrogen content of nitrate. The online simultaneous monitoring method is characterized by comprising the following steps: absorbing characteristics of ultraviolet light by using substances to be detected in water based on a Lambert-Beer principle and establishing a relation of absorbance and concentration of the substances to be detected; establishing a linear relation by using an absorbance value of a water sample at 254nm part and a chemical oxygen demand concentration value of the water sample; and establishing a linear relation between the absorbance value of the water sample at 210nm part and the nitrogen content of the nitrate. The monitoring method comprises two steps of calibrating the sensor and testing the water sample; and the measurement range on the chemical oxygen demand of the sensor provided by the invention is 0mg/L-50mg/L and the measurement range on the nitrogen of the nitrate is 0mg/L-7mg/L. The obvious superiority is displayed and the sensor can be directly put into water to measure so as to meet the detection requirements of a common water body.

Description

technical field [0001] The invention relates to a COD (chemical oxygen demand), multi-parameter online simultaneous monitoring sensor and method for nitrate nitrogen content, and the sensor can be used for simultaneous rapid detection and analysis of chemical oxygen demand and nitrate nitrogen content in water bodies , belongs to the field of sensor technology. Background technique [0002] Chemical Oxygen Demand (COD) refers to the amount of oxidant consumed to oxidize reducing substances in 1L of water sample under certain conditions, and the result is converted into oxygen content, and the unit is mg / L. COD is a measure of the concentration of organic and inorganic oxides contained in water, reflecting the degree of water pollution by reducing substances. It is very common for water bodies to be polluted by organic matter. Organic matter will excessively consume dissolved oxygen in the water body, causing eutrophication of the water body and bringing adverse effects on a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/33
Inventor 蒋洪明王晓冬金庆辉孙浩
Owner 能讯传感技术(上海)有限公司
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