Automatic analysis method for COD in sea water

A chemical oxygen demand, automatic analysis technology, applied in the direction of material analysis, material analysis, testing water, etc. through optical means, can solve the problems of inability to use chemical oxygen demand automatic analysis, labor-intensive, cumbersome operation, etc. Good recovery rate, strong anti-interference ability, good matching effect

Inactive Publication Date: 2004-04-28
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this standard method is a manual analysis method, and sampling, sample injection and data processing all rely on manual operations, which is not only cumbersome, labor-intensive, but also easy to introduce human error
[0004] Due to the characteristics of seawater quality, although there are many existing COD automatic analysis methods, none of them can be used for automatic analysis of chemical oxygen demand (COD) in seawater.

Method used

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  • Automatic analysis method for COD in sea water
  • Automatic analysis method for COD in sea water
  • Automatic analysis method for COD in sea water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1. Preparation of standard samples

[0023] (1) take glucose and be made into 1000mg / L COD standard aqueous solution as mother liquor;

[0024] (2) Dilute the mother liquor and prepare a series of standard samples. 6.0mg / L, 7.0mg / L, 8.0mg / L, 9.0mg / L, 10.0mg / L.

[0025] 2. Preparation of oxidizing solution

[0026] KMnO 4 After dissolving and diluting with distilled water, boil for 40-60 minutes, keep away from light, place overnight, and filter to make 3.6×10 -4 mol / L KMnO 4 Stock solution; dissolve NaOH in distilled water to configure a 2.5mol / L NaOH stock solution; take KMnO 4 Stock solution and NaOH stock solution were diluted with distilled water to prepare KMnO 4 The concentration is 6.0×10 -5 mol / L, the concentration of NaOH is 0.05mol / L oxidation solution.

[0027] 3. Preparation of acidizing solution

[0028]Slowly add concentrated sulfuric acid into water under stirring to form (1+3) sulfuric acid solution, dilute (1+3) sulfuric acid solution with wate...

Embodiment 2

[0040] 1. Preparation of standard samples

[0041] Same as Example 1.

[0042] 2. Preparation of oxidizing solution

[0043] KMnO 4 After dissolving and diluting with distilled water, boil for 40-60 minutes, keep away from light, place overnight, and filter to make 3.6×10 -4 mol / L KMnO 4 Stock solution; dissolve NaOH in distilled water to configure a 2.5mol / L NaOH stock solution; take KMnO 4 Stock solution and NaOH stock solution were diluted with distilled water to prepare KMnO 4 The concentration is 8.0×10 -5 mol / L, the concentration of NaOH is 0.06mol / L oxidation solution.

[0044] 3. Preparation of acidizing solution

[0045] Slowly add concentrated sulfuric acid into water under stirring to form (1+3) sulfuric acid solution, dilute (1+3) sulfuric acid solution with water to form 0.6mol / L H 2 SO 4 solution.

[0046] 4. Configuration of reduction chromogenic solution

[0047] Add a certain amount of soluble starch into distilled water and boil until the solution ...

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Abstract

The automatic analysis of COD in sea water includes flowing injection analysis and spectrophotometric detection. After the oxidizing liquid enters the analysis and detection flow channel, it is pushed by the pushing liquid into the heating reactor for mixing with acidifying liquid into the flow channel, and the mixture solution is pushed to mix and react with reducing-displaying liquid into the flow channel to produce base line to be measured. The standard sample or test sample entering the analysis and detection flow channel is pushed to mix with the oxidizing liquid and heating oxidized, reacted with the acidifying liquid, and the mixture liquid is pushed to mix and react with the reducing-displaying liquid to produce spectrogram to be drawn. By means of the method and instrument, sea water may be automatic detected in COD accurately and reliably.

Description

technical field [0001] The invention belongs to an analysis method for chemical oxygen demand (COD), in particular to an automatic analysis method for chemical oxygen demand (COD) in seawater. Background technique [0002] The ocean is the largest geographical resource of water body on the earth, and to a certain extent dominates the rise and fall of a country, and more and more wastes generated in the process of human production and life enter the ocean, causing ocean pollution. Among all kinds of pollution, organic pollution has the fastest growth rate and the most serious situation. However, due to the variety of organic matter, it is difficult to measure qualitatively and quantitatively. Therefore, chemical oxygen demand (COD) is usually used as a comprehensive index to evaluate the degree of organic pollution in water bodies. Compared with other water bodies, seawater is more difficult to measure chemical oxygen demand, the main reason is that s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/15G01N21/25G01N33/18G01N35/08
Inventor 张新申蒋小萍
Owner SICHUAN UNIV
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