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On-line monitoring method for double module linkage water quality

A water quality and linkage technology, applied in the measurement of color/spectral characteristics, etc., to achieve the effect of ensuring accuracy

Active Publication Date: 2013-01-02
YIWEN ENVIRONMENTAL SCI & TECH GUANGZHOU
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Problems solved by technology

[0009] The present invention is mainly to solve the problem that the results determined by the UV method need to be compared with the national standard method

Method used

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  • On-line monitoring method for double module linkage water quality
  • On-line monitoring method for double module linkage water quality

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Embodiment Construction

[0021] figure 1 A calibration flow diagram of an embodiment of the invention is shown, wherein:

[0022] (1) UV method for zero point calibration, that is, to measure the UV value of distilled water;

[0023] (2) Use the chemical detection module and the UV detection module to detect the water samples in the same period;

[0024] (3) Carry out linear regression analysis to two groups of data, calculate correlation equation:

[0025] COD or TOC=kUV+b

[0026] In the formula, UV——ultraviolet absorbance value (dimensionless, or l / m);

[0027] COD—chemical oxygen demand (mg / L);

[0028] TOC—total organic carbon (mg / L);

[0029] k——the slope of the linear equation;

[0030] b—the intercept of the linear equation.

[0031] figure 2 The detection flow chart of the embodiment of the present invention is shown, wherein: after calibration, the calculated correlation equation is input to the UV detection module, the water sample flows through the UV detection module,...

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Abstract

The invention mainly aims to solve the problem that a result measured by using a UV method needs comparing with the result of an international standard method, and discloses an on-line monitoring method for double module linkage water quality, which combines the UV method with a chemical method. The water quality can be measured (once every three seconds at a fastest speed) by using a UV method-based measuring module (a UV module for short); and simultaneously, a chemical method-based measuring module (a chemical measuring module for short) is used for measuring according to set time (measureonce every 0.5 hours to 30 days according to water quality change condition). Data of the two methods are compared and a null-point measurement is used for determining correlativity between a UV value and the result measured by the chemical method of the international method so as to evaluate a linear relation. The linear relation is input into the UV module as an operational formula (calibratingrelevant coefficients of the UV measuring module by using the chemical measuring module) of a COD or TOC value, so automatic comparison experiment between the UV method and the international method is achieved and the measuring instantaneity and correctness are ensured at the same time.

Description

technical field [0001] The present invention relates to a dual-mode linkage water quality online monitoring method combining UV method and chemical method, and in particular to a method for realizing automatic online comparison and calculation of correlation between UV method and national standard method in the instrument for COD online rapid measurement . Background technique [0002] With the development of China's economy, environmental pollution is becoming more and more serious. At present, most of the various water systems are polluted to varying degrees. Chemical Oxygen Demand (COD for short) refers to the amount of oxidant consumed by reducing substances that are easily oxidized by strong oxidants in water, and the result is converted into oxygen, in mg / L. The comprehensive index of reducing substances is one of the most important comprehensive indicators of organic pollution in water environment monitoring. Total organic carbon (TOC) is a comprehensive index that ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/33
Inventor 肖巍杨会霞刘宇兵
Owner YIWEN ENVIRONMENTAL SCI & TECH GUANGZHOU
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