Reference automatic analasing method for detecting chemical oxygen demand in seawater

A chemical oxygen demand, automatic analysis technology, applied in the field of chemical oxygen demand analysis, can solve the problems of complex system flow path, achieve the effect of good reproducibility, reduce cost, and eliminate salinity interference

Inactive Publication Date: 2005-08-24
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can conveniently and quickly carry out on-line automatic detection of chemical oxygen demand (COD) in seawater, and the COD measurement value of the actual seawater sample is in good agreement with the national standard measurement data, the result is accurate and reliable, and reagents are saved during the measurement. , but the flow path of the system is complicated, and precipitates will be generated during the analysis process, which needs to be cleaned after each use for the next use

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  • Reference automatic analasing method for detecting chemical oxygen demand in seawater
  • Reference automatic analasing method for detecting chemical oxygen demand in seawater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] In the present embodiment, the salinity of the tested seawater sample is 30‰, and its analysis steps are as follows:

[0027] 1. Preparation of standard samples

[0028] (1) Take analytically pure glucose, dissolve and dilute with water, and make 1000mg / L glucose mother liquor;

[0029] (2) Take COD-free seawater, add glucose mother liquor, and prepare a series of standard sample solutions containing glucose 0.5-8.0 mg / L.

[0030] 2. Preparation of oxidizing solution

[0031] Raw material: cerium sulfate Ce(SO 4 )·4H 2 O, 1:3 H 2 SO 4 and water.

[0032] Method: cerium sulfate Ce(SO 4 )·4H 2 Pour O into water and stir to dissolve, then add 1:3 H 2 SO 4 , and diluted with water, formulated with CeSO 4 6×10 -4 mol / L, H 2 SO 4 0.6mol / L solution.

[0033] 3. Preparation of driving fluid

[0034] Mix 3% NaCl solution with the above oxidizing solution at a ratio of 1:1 to prepare a driving solution.

[0035] 4. Test drawing of sample spectrum

[0036] The ...

Embodiment 2

[0043] In the present embodiment, the salinity of the tested seawater sample is 20‰, and its analysis steps are as follows:

[0044] 1. Preparation of standard samples

[0045] (1) Take analytically pure glucose, dissolve and dilute with water, and make 1000mg / L glucose mother liquor;

[0046] (2) Take COD-free seawater, add glucose mother liquor, and prepare a series of standard sample solutions containing glucose 0.5-8.0 mg / L.

[0047] 2. Preparation of oxidizing solution

[0048] Raw material: cerium sulfate Ce(SO 4 )·4H 2 O, 1:3 H 2 SO 4 and water.

[0049] Method: cerium sulfate Ce(SO 4 )·4H 2 Pour O into water and stir to dissolve, then add 1:3 H 2 SO 4 , and diluted with water, formulated with CeSO 4 3×10 -4 mol / L, H 2 SO 4 0.8mol / L solution.

[0050] 3. Preparation of driving fluid

[0051] Mix 2% NaCl solution with the above-mentioned oxidizing solution at a ratio of 1:1 to prepare a driving solution.

[0052] 4. Test drawing of sample spectrum

[...

Embodiment 3

[0060] In the present embodiment, the salinity of the tested seawater sample is 35‰, and its analysis steps are as follows:

[0061] 1. Preparation of standard samples

[0062] (1) Take analytically pure glucose, dissolve and dilute with water, and make 1000mg / L glucose mother liquor;

[0063] (2) Take COD-free seawater, add glucose mother liquor, and prepare a series of standard sample solutions containing glucose 0.5-8.0 mg / L.

[0064] 2. Preparation of oxidizing solution

[0065] Raw material: cerium sulfate Ce(SO 4 )·4H 2 O, 1:3 H 2 SO 4 and water.

[0066] Method: cerium sulfate Ce(SO 4 )·4H 2 Pour O into water and stir to dissolve, then add 1:3 H 2 SO 4 , and diluted with water, formulated with CeSO 4 8×10 -4 mol / L, H 2 SO 4 0.4mol / L solution.

[0067] 3. Preparation of NaCl solution

[0068] Prepare NaCl and water to make a 3.5% NaCl solution.

[0069] 4. Test drawing of sample spectrum

[0070] use press figure 2 The automatic analyzer designed for...

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Abstract

The invention is an automatic analytic method for detecting the chemical oxygen demand in seawater, the analysis steps including the standard sample test analysis and the test specimen test analysis, the test specimen test spectrogram compares with the standard spectrogram. The standard sample and the test specimen test analysis includes the mapping of baseline and the measured material spectrogram. The impetus fluid for sake of having the same salinity the sea water test specimen or the close NaCl solution and the oxidized fluid intermixture, the analysis of the electrocircuit through the measuring instrument to form the baseline to survey and draw; The oxidized fluid is CeSO4- the H2SO4 watery solution, the standard sample or the test specimen enters the type class road and the oxidized fluid mix after the measuring instrument enters the analysis to flow the road, the electrocircuit in under the impetus fluid impetus through the analysis to form the spectrogram to survey and draw. This method can automatically eliminate the salinity disturbance caused by massive NaCl in the sea water, satisfies the determination of the high sensitivity request and the accurate request, and simplify the electrocircuit of the system.

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] Regarding the determination of chemical oxygen demand (COD) in seawater, my country's national standard (GB17378.4-1998) adopts the alkaline potassium permanganate method, but this standard method is a manual analysis method, and sampling, sample injection and data processing all rely on Compared with manual operation, it is not only cumbersome and labor-intensive, but also easy to introduce human errors. [0003] The Chinese patent No. ZL02113482.0 discloses an automatic analysis method for chemical oxygen demand, which belongs to the acidic potassium permanganate method, and its impelling liquid and oxidizing liquid are formed by potassium permanganate and sulfuric acid with different concentrations. Aqueous solution, its flo...

Claims

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Application Information

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