Method for directly measuring concentration of DON (Dissolved Organic Nitrogen) in water body based on electrodialysis pretreatment manner

A dissolved organic nitrogen and electrodialysis technology, which is applied in the fields of environmental protection and water treatment, can solve the problems of low accuracy, long time consumption and high degree of error, and achieves improved accuracy and precision, simple operating conditions and saving processing time. Effect

Active Publication Date: 2014-08-06
陈白杨
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to overcome the shortcomings of the existing DON measurement method, such as long time consumption, low precision, high error degree, indirect and complex operation, etc., the present invention provides a method that can realize direct, fast and accurate measurement of water body DON

Method used

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  • Method for directly measuring concentration of DON (Dissolved Organic Nitrogen) in water body based on electrodialysis pretreatment manner
  • Method for directly measuring concentration of DON (Dissolved Organic Nitrogen) in water body based on electrodialysis pretreatment manner
  • Method for directly measuring concentration of DON (Dissolved Organic Nitrogen) in water body based on electrodialysis pretreatment manner

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Experimental program
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Effect test

Embodiment 1

[0042] Specific overall implementation plan and steps

[0043] Step 1: Before electrodialysis pretreatment, filter the water sample to be tested with a 0.45 μm cellulose ester membrane to remove suspended solids and particulate impurities (if it cannot be measured in time, the water after membrane filtration needs to be stored) stored in a refrigerator at 4°C).

[0044] Step 2: Treat the ion-exchange membrane according to the factory requirements of the ion-exchange membrane, install and debug the electrodialysis device, and ensure that the pH of the water sample is kept between 1 and 10 during the electrodialysis process.

[0045] Step 3: Take an appropriate amount of filtered water sample and put it into the dilute chamber of the electrodialysis device, put salt water into the concentrated chamber, and load a constant DC voltage of less than 30V to perform electrodialysis pretreatment (see the appendix for the principle of electrodialysis) figure 1 and 2 ), the removal rate ...

Embodiment 2

[0049] According to the specific overall scheme and steps of embodiment 1, and image 3 The specific implementation parameter scheme shown in

[0050] The recovery rate and accuracy of organic nitrogen in natural water were investigated, by adding quantitative DIN and DON to natural water, and then tracking and measuring the content of DIN and DON in water samples. According to the implementation steps described in this plan, the recovery rate and precision of DON at different time points are compared, and the effect is as attached Figure 5 .

[0051] The results show that with the progress of the electrodialysis process, the concentration of DIN decreases continuously, and the ratio of DIN / TDN also decreases continuously. The recovery rate of DON is between 93% and 110%, and the measurement accuracy decreases with the increase of DIN. , increasing continuously, its relative percentage error decreased from 33% to 2.3%. It thus proved that there is a significant benefit for...

Embodiment 3

[0053] According to the specific overall implementation scheme and steps of embodiment 1, and image 3 Specific implementation parameters shown

[0054] The DON content in the water of a lake in Shenzhen, the water of a river in Shenzhen, the effluent of a water plant in Shenzhen, and the influent and effluent of a sewage plant in Shenzhen were respectively investigated.

[0055] According to the implementation steps of the present invention, the measured value of DON in the water sample without electrodialysis pretreatment and electrodialysis pretreatment was compared respectively, and the effect was attached Figure 6 .

[0056] Table 1: Instruments used during the experiment

[0057]

[0058] From Figure 6 It can be seen from the figure that when the water samples of several water bodies are not pretreated by electrodialysis, the concentration of DON in the water cannot be obtained, and even negative values ​​are measured; the measured value of DON after electrodialy...

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Abstract

The invention provides a method for directly measuring concentration of DON (Dissolved Organic Nitrogen) in water body based on an electrodialysis pretreatment manner. The method is characterized by comprising the following steps: firstly, quickly and effectively separating DON from DIN (Dissolved Inorganic Nitrogen) by adopting an electrodialysis separation technology, and then directly obtaining the DON concentration through the TDN (Total Dissolved Nitrogen) test. The purpose of the electrodialysis is to remove the DIN and retain the DON; when the content of DON accounts for a major part of the TDN (for example, the proportion of the DIN to the TDN is smaller than 0.1) in a treated water sample, the electrodialysis treatment is stopped, and after a while, the content of the TDN is equal to the content of the DON in the water sample. The method greatly improves the accuracy and precision of the DON measurement in the water sample, solves the problems that the conventional water sample DON measuring method is indirect, and low in accuracy and precision, and consumes time, can be widely applied to the DON detection in various water bodies, and also can be used for measuring the DON in solid particles or atmospheric haze particles capable of being dissolved in water.

Description

technical field [0001] The invention belongs to the fields of environmental protection and water treatment, and specifically relates to a method for directly measuring the concentration of dissolved organic nitrogen (DON) in a water body by using an electrodialysis pretreatment method. It can be applied to environmental protection and various DON measurements using water as a carrier, such as water treatment, ocean, agricultural fertilization and atmospheric smog. Background technique [0002] There are various kinds of dissolved organic matter widely in the environment, and nitrogen-containing organic matter is an important part of it. Total dissolved nitrogen (TDN) includes organic nitrogen (DON) and inorganic nitrogen (DIN). Under certain conditions, DON can be converted into DIN and used by microorganisms as a nitrogen source reserve, which is one of the causes of environmental hazards such as water eutrophication. This is, recent studies have shown that DON in water r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/18G01N21/33
Inventor 陈白杨朱安邦张靓隋月婷
Owner 陈白杨
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