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Cod measuring method and device

A measuring method and measuring device technology, applied in the field of COD conversion formula, can solve problems such as inability to use correlation, and achieve the effect of less relative error

Active Publication Date: 2006-05-10
SHIMADZU SEISAKUSHO LTD
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

Therefore, it may not be possible to obtain a good correlation with COD using the COD conversion formula using the absorbance of a single ultraviolet wavelength.

Method used

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  • Cod measuring method and device

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Embodiment Construction

[0043] figure 1 It is a figure which shows an example of the absorptiometer which can be used as a COD measuring apparatus.

[0044] As the light source 1, a light source that outputs a continuous spectrum from the ultraviolet region to the visible region is preferable. An example of this is a xenon lamp. However, the light source is not limited thereto, and may be a mercury lamp or the like having a plurality of bright line spectra from the ultraviolet region to the visible region. Here, a light source that outputs a continuous spectrum like a xenon lamp is used.

[0045] The measuring cell 2 is a flow cell through which sample water can flow. The measurement cell 2 is made of synthetic quartz as a window material or the entire cell so that the light from the light source 1 can pass through the sample water.

[0046] 14 is a grating constituting a beam splitter for splitting light of a continuous spectrum, for example, a concave diffraction grating. A slit 13 serving as a...

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Abstract

The invention provides a method and a device for measuring COD. The COD conversion formula storage unit (20) of the calculation processing unit of the COD measurement device holds a COD conversion formula representing the relationship between the total absorbance and the COD value linearly combined by assigning weighting coefficients to the absorbance at a plurality of wavelengths, and the conversion unit (22) Calculate and output the converted COD value using this COD conversion formula. Preferably, the COD conversion formula calculation part (26) calculates the COD conversion formula based on the relationship between the total absorbance and the measured COD value of the sample water, and the correlation calculation part (28) calculates the COD conversion formula calculation part (26). The COD conversion formula calculates the respective correlations. At this time, the COD conversion formula storage unit (20) stores the conversion formula with the best correlation among the COD conversion formulas calculated by the COD conversion formula calculation unit (26) as the COD conversion formula for the sample water. According to the present invention, a COD conversion formula suitable for sample water can be used.

Description

technical field [0001] The present invention relates to the creation of a COD conversion formula (regression formula) for converting UV values ​​into COD values ​​based on the correlation between ultraviolet (UV) absorbance of discharged water or environmental water and COD (chemical oxygen consumption) measured values. This is a measuring method and device for obtaining converted COD values ​​from UV values ​​measured for sample water. [0002] COD adopts the concept including BOD (Biological Oxygen Demand). Background technique [0003] Japanese Industrial Standards (JIS) specifies automatic ultraviolet absorbance measuring instruments for water quality monitoring, and correlates UV measured values ​​with COD, and uses them in calculations of water pollution loads for total water quality restrictions (see Non-Patent Document 1). [0004] Used in COD determination as Figure 6 The absorptiometer shown. Light from a light source 1 such as a low-pressure mercury lamp is irr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/33G01N33/18
CPCG01N21/33G01N33/1806G01N33/1893
Inventor 板桥亨久森田洋造
Owner SHIMADZU SEISAKUSHO LTD
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