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Calibration method of spectroscopic seawater COD sensor and COD sensor

A technology of calibration, calibration and sensor, applied in the field of spectroscopic seawater COD sensor, can solve problems such as time-consuming, inability to use rapid calibration and calibration, and heavy workload.

Pending Publication Date: 2021-04-23
山东达峰海洋科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a fast calibration method for spectroscopic seawater COD sensor and the spectroscopic seawater COD sensor calibrated by this method, aiming to solve the long time-consuming calibration method of spectroscopic COD sensor in the prior art And the workload is so large that it cannot be used for on-site rapid calibration of seawater

Method used

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  • Calibration method of spectroscopic seawater COD sensor and COD sensor
  • Calibration method of spectroscopic seawater COD sensor and COD sensor
  • Calibration method of spectroscopic seawater COD sensor and COD sensor

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Embodiment 1

[0047] A rapid calibration method for a spectroscopic seawater COD sensor of the present invention comprises the following steps:

[0048] 1) Take analytically pure 5-hydroxymethyl furfural and dissolve it in artificial seawater. The salinity of artificial seawater is 35‰, and the prepared concentrations are 0mg / L, 1mg / L, 2mg / L, 4mg / L and 8mg / L respectively. The liquid to be tested is ready for use;

[0049] 2) adopt the spectrometry seawater COD sensor for the liquid to be tested of step 1) gained, measure the absorbance under the 254nm wavelength, and the spectrometry seawater COD sensor is the spectrometry of the COD-202010-01 model produced by the Institute of Marine Instrumentation, Shandong Academy of Sciences Seawater COD sensor, absorbance at different concentrations, the curve equation of absorbance at different concentrations is: y=0.0251x-0.0296, R 2 =0.9998, where y represents the absorbance value, x is the concentration of the liquid to be tested, and R is the co...

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Abstract

The invention discloses a calibration method of a spectroscopic seawater COD sensor and the COD sensor. The method comprises the following steps: 1) dissolving 5-hydroxymethylfurfural in artificial seawater to prepare to-be-detected solutions with different concentrations; 2) measuring the absorbance of the to-be-detected solution under the wavelength of 254nm by adopting the spectroscopic seawater COD sensor; 3) measuring the COD value of the to-be-detected solution according to GB 17378.4-2007; 4) calculating according to the absorbance and the COD value to obtain an absorbance and COD value model curve; and 5) inputting the absorbance and the COD value model curve into the spectroscopic seawater COD sensor, and calibrating the spectroscopic seawater COD sensor. The conversion relation between the absorbance and the COD value is good in repeatability, the spectroscopic seawater COD sensor calibrated by the method can be directly used, the operation time is greatly shortened, chemical reagents are saved, the problem of blank calibration materials of the spectroscopic seawater COD sensor is solved, and the method is high in accuracy and good in repeatability.

Description

technical field [0001] The invention belongs to the technical field of seawater detection, in particular to a rapid calibration and calibration method of a spectroscopic seawater COD sensor and a spectroscopic seawater COD sensor calibrated by the method. Background technique [0002] Seawater chemical oxygen demand (COD) refers to the amount of oxidant consumed when a strong oxidant is used to treat water samples under certain conditions, expressed in mg / L of oxygen. Chemical oxygen demand is usually used to characterize the comprehensive organic pollution degree of seawater and is an important indicator to measure the environmental quality of seawater. The higher the COD value, the more serious the water pollution. At present, the commonly used method for the determination of seawater COD is the national standard alkaline potassium permanganate method, that is, under alkaline heating conditions, with a known amount and excess potassium permanganate, oxygen-demanding subst...

Claims

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Application Information

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IPC IPC(8): G01N21/33
Inventor 张丽王阳王婧茹孔祥峰高楠郭翠莲孙开明张艳敏荀小罡邹妍吕美蓉
Owner 山东达峰海洋科技有限公司
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