Seawater COD detection method

A detection method, seawater technology, applied in the direction of Raman scattering, material excitation analysis, etc., can solve the problems that water samples are easily polluted by secondary pollution, the detection effect is affected, and the detection process is cumbersome, so as to shorten the detection time, the detection method is environmentally friendly, The effect of simplifying the operation steps

Active Publication Date: 2018-12-21
YANSHAN UNIV
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Problems solved by technology

However, these methods have problems such as cumbersome detection process, long detection time, and secondary pollution of water samples. In order to avoid these problems, spectral absorption method has become a COD detection method that has been studied more in recent years.
At present, the fluorescence interference is relatively large in the ultraviolet-visible light band detection, and the interference of the infrared absorption peak of water molecules also affects the detection effect in the near-infrared light band detection

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  • Seawater COD detection method

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Embodiment 1

[0042]Add different volumes of COD standard solutions with a concentration of 1000mg / L to each 10mL actual seawater sample to obtain 35 groups of actual seawater samples with a COD concentration ranging from 0.5 to 100mg / L, and the concentration gradient of the low concentration range of 0.5 to 10mg / L is 0.5mg / L, the high concentration range is 10-100mg / L and the concentration gradient is 5mg / L. Take sea crystals and distilled water with a mass ratio of 1:25 to prepare a simulated seawater sample with a salinity of 30, add different volumes of COD standard solutions with a concentration of 1000mg / L to each 10mL sample, and obtain a COD concentration ranging from 0.5 to 100mg / L simulated seawater samples in 35 groups, in which the low concentration range of 0.5-10mg / L has a concentration gradient of 0.5mg / L, and the high concentration range of 10-100mg / L has a concentration gradient of 5mg / L.

[0043] Place simulated seawater samples in figure 1 in the sample pool. Use the p...

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Abstract

The invention provides a seawater COD detection method, and belongs to the field of seawater detection. According to the seawater COD detection method, complicated pretreatment and chemical analysis does not need to be carried out on a practical seawater sample, operation steps are greatly simplified, and detection time is shortened. Different absorption characteristics of different substances byRaman spectrum minimize the influence of visible-near-infrared band light absorption by properties of water, the interference of fluorescence to the detection result is reduced by using the Raman spectrum, so that the detection result is more accurate; and compared with the traditional detection, the seawater COD detection method is environment friendly and cannot consume a large number of chemical reagents, and thus cannot cause an adverse effect to the environment.

Description

technical field [0001] The invention relates to the technical field of seawater detection, in particular to a seawater COD detection method. Background technique [0002] Water resources are an important resource for our survival and development. However, industrial waste water, domestic sewage and other wastes enter water bodies such as rivers, lakes and seas, and the pollution produced is greater than the purification capacity of the water body. This will lead to changes in many characteristics of water bodies, so the value of water will also be affected, endangering human health, causing damage to the ecological environment, and deteriorating water quality. Therefore, it is extremely important to detect and monitor ocean water quality. [0003] The sum of all reducing substances that need to be oxidized in water is called chemical oxygen demand, which can indicate the pollution of water samples, and is often expressed by the symbol COD (Chemical Oxygen Demand). At pres...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65
CPCG01N21/65
Inventor 吴国庆王碧霖张宏扬韩明宏
Owner YANSHAN UNIV
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