Device and method for detecting concentration of divalent iron ions in real time

A real-time detection and ion concentration technology, applied in the field of analysis and detection, can solve problems such as influence and inability to capture detail changes well, and achieve the effect of real-time detection

Pending Publication Date: 2019-05-14
天津市生态环境科学研究院
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  • Abstract
  • Description
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Problems solved by technology

However, there are two problems in such research. First, the set concentration gradient is a set concentration, which is not a continuous change process, so it cannot capture the real-time details of ferrous ions participating in the reaction process. Second, in the course of the reaction, it is necessary to add other reagents and control the pH value, etc. In the process of adding these reagents and regulating the pH, it is inevitable that the ferrous ion solution is in contact with the air, so that the oxygen in the air has a negative effect on the water body. The influence of unstable ferrous ions in

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  • Device and method for detecting concentration of divalent iron ions in real time

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Experimental program
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Effect test

Embodiment 1

[0039] N was introduced into the closed reactor 2 and CO 2 Mixed gas, control the ratio of mixed gas to 8:1, keep its pH at 6.5, set the temperature in the multifunctional reaction box to 25°C, and keep it away from light. The dissolved organic matter solution (DOM, concentration 30mg / L) and the ferrous ion solution (concentration is 0.5mg / L) in the ferrous ion reagent injector were passed into the airtight reactor. After the experiment started, the DOM solution flow rate gradually increased from 0mL / s to 5mL / s, the ferrous ion reagent solution flow control is 5mL / s, carries out the binding reaction of DOM and ferrous ion, obtains complex product and remaining ferrous ion solution; The iron ion solution is controlled by a peristaltic pump into the color reactor, and reacts with o-phenanthroline solution (concentration: 0.5mg / L), and the flow ratio of the two is 3:1 to obtain a color product; real-time measurement shows The concentration of the colored product was obtained to...

Embodiment 2

[0041] N was introduced into the closed reactor 2 and CO 2 Mixed gas, control the ratio of mixed gas to 5:1, keep its pH at 5.5, set the temperature in the multifunctional reaction box to 20°C, and in the state of natural light, put the nitrobenzene solution (concentration of 0.01 μg / L) and the ferrous ion solution (concentration is 0.1mg / L) in the ferrous ion reagent injector are passed in the airtight reactor, carry out ferrous ion reduction nitrobenzene reaction, after experiment begins, The flow of ferrous ion solution increases gradually from 0mL / s to 10mL / s, and the flow of nitrobenzene solution is controlled to be 2mL / s to obtain the reacted product and the remaining ferrous ion solution; The iron ion solution is controlled by a peristaltic pump into the color reactor, and reacts with o-phenanthroline solution (concentration: 0.5mg / L), and the flow ratio of the two is 3:1 to obtain a color product; real-time measurement shows The concentration of the colored product w...

Embodiment 3

[0043] N was introduced into the closed reactor 2 and CO 2 Mixed gas, control the ratio of mixed gas to 4:1, keep its pH at 5.5, set the temperature in the multifunctional reaction box to 25°C, and put the domestic sewage (COD concentration of 300mg / L) and the ferrous ion solution (concentration of 0.2mg / L) in the ferrous ion reagent injector are passed into the multifunctional reaction box, and the flow rate of the two is controlled at 10mL / s, and the ferrous ion solution induced by ultraviolet light is carried out. Ion reaction, after the experiment started, the light intensity was gradually increased from 0W to 500W, and the remaining ferrous ion solution after the induction reaction was obtained; the remaining ferrous ion solution after the induction reaction was controlled by a peristaltic pump into the color reactor In the process, carry out color reaction with o-phenanthroline solution (concentration is 0.5mg / L), and the flow ratio of the two is 1:1 to obtain the colo...

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Abstract

The invention belongs to the technical field of analysis and detection, and in particular relates to a device and method for detecting the concentration of divalent iron ions in real time. According to the device and the method in the invention, the reaction participated by divalent iron ions is carried out in a multifunctional reaction box in real time; a reaction product of the reaction participated by the divalent iron ions can be in colour development reaction with a colour developing agent in real time; therefore, the process of the reaction participated by the divalent iron ions is a continuous real-time process; furthermore, the concentration of the divalent iron ions can be detected at any time by measurement of the concentration of a colour development product; and real-time detection of the concentration of the divalent iron ions is realized. By means of the device and the method in the invention, the whole reaction process is carried out in an air isolated environment; all reaction conditions can be controlled through an external environment; and the problem that the measurement precision is inaccurate due to the fact that divalent iron ion solution is qualitatively changed while being artificially contacted in the reaction process can be avoided.

Description

technical field [0001] The invention relates to the technical field of analysis and detection, in particular to a device and method for real-time detection of the concentration of divalent iron ions. Background technique [0002] Ferrous ions are an extremely unstable form of iron. In aqueous solution, ferric ions are easily oxidized by air to produce qualitative changes. In the existing research on the chemical reaction of ferrous ions, a series of ferrous ion solutions with different concentrations are usually set up, and then other reagents are added or different conditions are set to react, and then the change law of ferrous ions is studied. However, there are two problems in such research. First, the set concentration gradient is a set concentration, which is not a continuous change process, so it cannot capture the real-time details of ferrous ions participating in the reaction process. Second, in the course of the reaction, it is necessary to add other reagents and c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78G01N21/01
Inventor 张彦李慧刘琼琼周滨李艳英徐威杰柴曼田杰
Owner 天津市生态环境科学研究院
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