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Total organic carbon analysis instrument and method based on electrochemical catalytic oxidation

A technology of catalytic oxidation and total organic carbon, applied in the direction of material analysis, scientific instruments, and analytical materials through optical means, can solve problems such as high-temperature combustion, achieve the effects of improving measurement accuracy, mild reaction conditions, and increasing the scope of application

Inactive Publication Date: 2014-04-23
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of existing analyzers that need to strengthen toxic substances such as acid or strong oxidizing properties, or the high-temperature combustion of organic carbon, and provide a total organic carbon analyzer based on electrochemical catalytic oxidation and its method

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  • Total organic carbon analysis instrument and method based on electrochemical catalytic oxidation

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Effect test

Embodiment 1

[0030] A boron-doped diamond electrode is used for the anode, and a stainless steel plate is used for the cathode; the boron-doped diamond electrode is obtained by chemical vapor deposition method, and a dense diamond film is deposited on the conductive tantalum surface by doping diborane in the gas phase.

[0031] Inject the water sample into the electrochemical reaction cell 1, add NaH containing 99% 0.5 mol / L 2 PO 4 +1% 0.5 mol / L Na 2 HPO 4 Reaction solution 5, nitrogen gas was blown in to remove CO in gas phase and water phase 2 .

[0032] Determination of CO in gas phase and water phase by using non-dispersive infrared detector (NDIR) 2 and ion selective electrode 6 2 Concentration, the concentration of inorganic carbon (IC) in the solution is calculated.

[0033] Connect the cathode and anode to an external DC circuit, so that an electrochemical reaction occurs between the plates, and the organic carbon in the water is oxidized to CO 2 . Part of CO 2 Dissolved in...

Embodiment 2

[0038] The anode is made of graphite electrode, and the cathode is made of graphite electrode;

[0039] Inject the water sample into the electrochemical reaction cell 1, add NaH containing 99% 0.5 mol / L 2 PO 4 +1% 0.5 mol / L Na 2 HPO 4 The reaction solution 5 was blown with argon gas to remove CO in the gas phase and the water phase 2 .

[0040] Determination of CO in gas phase and water phase by using non-dispersive infrared detector (NDIR) 2 and ion selective electrode 6 2 Concentration, the concentration of inorganic carbon (IC) in the solution is calculated.

[0041] Connect the cathode and anode to an external DC circuit, so that an electrochemical reaction occurs between the plates, and the organic carbon in the water is oxidized to CO 2 . Part of CO 2 Dissolved in water, the other part enters the upper gas collection chamber 11 through the polypropylene gas diffusion membrane 7 and the moisture exchanger 10 made of TEFLON polymer tube layer material.

[0042] Th...

Embodiment 3

[0046] The anode is a platinum electrode, and the cathode is a boron-doped diamond electrode. The boron-doped diamond electrode is obtained by chemical vapor deposition, through gas-phase doping of diboron trioxide, and depositing a dense diamond film on the surface of conductive graphite.

[0047] Inject the water sample into the electrochemical reaction cell 1, add NaH containing 99% 0.5 mol / L 2 PO 4 +1% 0.5 mol / L Na 2 HPO 4 The reaction solution 5 was filled with helium gas to remove CO in the gas phase and water phase. 2 .

[0048] Determination of CO in gas phase and water phase by using non-dispersive infrared detector (NDIR) 2 and ion selective electrode 6 2 Concentration, the concentration of inorganic carbon (IC) in the solution is calculated.

[0049] Connect the cathode and anode to an external DC circuit, so that an electrochemical reaction occurs between the plates, and the organic carbon in the water is oxidized to CO 2 . Part of CO 2 Dissolved in water, ...

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Abstract

The invention discloses a total organic carbon analysis instrument and a method based on an electrochemical catalytic oxidation. The total organic carbon analysis instrument includes an electrochemical reaction pool, a non-dispersive infrared detector, a gas diffusion film, a wet gas exchanger and a gas collecting chamber; an analysis instrument body is sequentially provided with the gas collecting chamber, the wet gas exchanger, the gas diffusion film and the electrochemical reaction pool from top to bottom; the middle part of the gas collecting chamber is insertedly provided with the non-dispersive infrared detector; the electrochemical reaction pool comprises an anode, a cathode, a reaction liquid and a waste liquid discharge port, the inner side wall of the electrochemical reaction pool is oppositely provided with the anode and the cathode, the side wall of the electrochemical reaction pool is provided with the waste liquid discharge port, and the electrochemical reaction pool is internally provided with the reaction liquid; the wet gas exchanger adopts a Nafion or TEFLON polymer tube layer material. The total organic carbon analysis instrument has the characteristics of safety, economy, high efficiency and the like, meets water quality monitoring under microgravity, and can realize on-line continuous monitoring.

Description

technical field [0001] The invention relates to a total organic carbon (TOC) analyzer, in particular to a total organic carbon analyzer based on electrochemical catalytic oxidation and a method thereof. Background technique [0002] In environmental, medical, chemical and other fields, it is often necessary to determine the total organic carbon (TOC) in water. The basic principle of the TOC analyzer is to oxidize the carbon of the organic matter in the water into CO 2 , after eliminating interference factors by CO 2 Detector measurement, and then by data processing the CO 2 The gas content is converted to the concentration of organic matter in the water. At present, common oxidation methods include wet oxidation (persulfate), high-temperature catalytic combustion oxidation, ultraviolet (UV) oxidation, UV-wet oxidation, etc. These methods need to strengthen acid or strong oxidizing substances such as toxic substances, or high-temperature combustion Wait. The first-genera...

Claims

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Application Information

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IPC IPC(8): G01N21/3504G01N1/28
Inventor 雷乐成杨彬李浩余青霓
Owner ZHEJIANG UNIV
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