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Method for estimating river humification index (HIX)

A technology of humification and index, which is applied in the field of estimating humification index, and can solve problems such as the impact of HIX

Active Publication Date: 2018-11-27
NORTHEAST INST OF GEOGRAPHY & AGRIECOLOGY C A S
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Problems solved by technology

[0004] The purpose of the present invention is to solve the technical problem that the actual measurement and tedious calculation operations of instruments and surveyors affect HIX in the process of using three-dimensional fluorescence technology and FRI fluorescence area integration technology in the existing method, and to provide a method for estimating the humification of rivers index method

Method used

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  • Method for estimating river humification index (HIX)
  • Method for estimating river humification index (HIX)
  • Method for estimating river humification index (HIX)

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Experimental program
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specific Embodiment approach 1

[0028] Specific implementation mode one: the method for estimating the river humification index in this implementation mode is carried out according to the following steps:

[0029] 1. 368 water samples were collected in the Yangtze River Basin, Yellow River Basin, Songhua River Basin, Haihe River Basin, Liaohe River Basin, Pearl River Basin, Huaihe River Basin and Qinghai-Tibet inland flow area. The DOC concentration range of the water samples was 0.76-226.9mg / L, For each water sample, 2500ml of water located 0.1m below the water surface and in the middle of the river was collected, refrigerated in a refrigerator at 4°C, and filtered with a 0.22μm Whatman polycarbonate membrane to obtain CDOM water samples;

[0030] 2. Put the CDOM water sample into the cuvette, measure the absorbance of the water sample CDOM at a wavelength of 200-800nm, and obtain the absorption coefficient of the CDOM water sample, and use the absorption coefficient CDOM of the CDOM water sample at 254nm 2...

specific Embodiment approach 2

[0042] Embodiment 2: This embodiment differs from Embodiment 1 in that there are 368 water sample collection points in Step 1. Others are the same as in the first embodiment.

[0043] The concentration range of DOC in the water samples of each basin was 0.76-226.9mg / L.

specific Embodiment approach 3

[0044]Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that in step two, Shimadzu UV-2600PC ultraviolet spectrophotometer is used to measure the absorbance of CDOM water sample. Others are the same as in the first or second embodiment.

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Abstract

The invention discloses a method for estimating river humification index (HIX) and belongs to the field of river water environment assessment with an aim to solve the technical problem that HIX is affected by actual measurement and tedious calculation by instruments and measuring personnel with a three-dimensional fluorescence technique and an FRI (fluorescence regional integration) technology inan existing method. The method includes 1), performing sampling; 2), measuring CDOM (chromophoric dissolved organic matter) absorbancy of a water sample; 3), performing quantitative analysis of three-dimensional fluorescence spectrum with the FRI method, and calculating the HIX; 4), constructing the correlation between CDOM254 and HIX, performing description with following models: HIX=0.1093XCDOM254+1.4839, wherein R<2>=0.864, p is smaller than 0.01, and estimating the HIX by measuring CDOM254 of the water sample. The mean absolute percentage error (MAPE) of the measured HIX and the HIX calculated according to the method is only 18.27%, the specific value of the measured HIX to the HIX calculated with the method is 0.93, and the CDOM254 and HIX models are good in precision.

Description

technical field [0001] The invention belongs to the field of river water environment evaluation, in particular to a method for estimating humification index. Background technique [0002] DOM (dissolved organic matter) widely exists in rivers, and its functional groups are abundant and its mobility is high. In addition, it is rich in nutrients such as C, N, and P, and then participates in various physical and chemical reaction processes in the water environment, which has an important impact on the quality of the water environment. The composition and size of DOM determine the carbon cycle and carbon dioxide emissions to a certain extent, and can even affect global climate change. Colored dissolved organic matter CDOM (chromophoric dissolved organic matter) is an important part of DOM and widely exists in various natural water bodies, and is an important material affecting river ecosystems. Therefore, the distribution and composition of DOM in water bodies has become one o...

Claims

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Application Information

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IPC IPC(8): G01N21/33G01N21/64
CPCG01N21/33G01N21/64
Inventor 尚盈辛宋开山温志丹刘阁房冲吕丽丽
Owner NORTHEAST INST OF GEOGRAPHY & AGRIECOLOGY C A S
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