The method of judging the source of cod in river and lake water in natural background

Abstract

The invention relates to a method for judging a COD source of a river and lake water body under a natural background. The method comprises the following steps: pretreating a sample, and filtering to remove suspended matters and microorganisms; absorbance measurement and correction: acquiring the corrected absorbance at the position of 210-530 nm; performing fluorescence spectrum measurement and correction: subtracting a fluorescence spectrum of the ultrapure water from the fluorescence spectrum measured by each sample to obtain a three-dimensional fluorescence spectrum of each sample; using the corrected absorbance at the 210-530 nm position for correction to acquire a corrected three-dimensional fluorescence spectrum; calculating the fluorescence index of each sample by utilizing the corrected three-dimensional fluorescence spectrum; and calculating a land area contribution rate or an authigenic source contribution rate. Components and sources of COD in the water body under the natural background can be more truly reflected by the sample. Ultraviolet light and fluorescence spectra are corrected, so that the calculation result is more accurate; the relationship between the terrestrial source contribution rate and the fluorescence index is quantified, and a direction is provided for the management decision of the basin water environment.

Description

technical field [0001] The invention relates to the field of ecological environment protection and restoration, in particular to a method for discriminating the characteristics and sources of COD components in river and lake water in a natural background. Background technique [0002] There are many kinds of organic substances in water, such as animal and plant fibers, oils, sugars, dyes, organic acids, various organic synthetic industrial products, organic raw materials, etc. The concentration of organic matter in water can be indirectly characterized by the corresponding oxygen demand. The most common characterization method is the determination of chemical oxygen demand (CODcr) in water by the potassium dichromate method. Surface water environmental quality standard (GB3838-2002) regards 15mg / L, 20mg / L, 30mg / L, 40mg / L as water body COD Cr Thresholds for Class II, III, IV and V assessments. In general, a large amount of organic pollutants discharged by human activities ...

AI Technical Summary

Problems solved by technology

[0003] Existing monitoring methods only measure the total amount of COD, without considering the source of COD in lake water under natural background conditions, and it is difficult to measure the relative proportions of various components, so they cannot objectively reflect the actual situation of man-made pollution, and will inevitably affect the water quality of the basin. Environmental management decisions are misleading

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