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A technology of eutrophication and lakes, applied in the preparation of test samples, testing of organic pollutants in water, measuring devices, etc.
Inactive Publication Date: 2018-10-02
NORTHEAST INST OF GEOGRAPHY & AGRIECOLOGY C A S
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[0004] The present invention aims to solve the influence of multi-water quality parameter measurement on TSI in the calculation process of the existing trophic state index (TSI), and provides a new method for evaluating lake eutrophication
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specific Embodiment approach 1
[0034] Specific implementation mode one: the method for evaluating lake eutrophication in this implementation mode includes the following steps:
[0035] 1. Sampling the lake to obtain lake water quality samples;
[0036] 2. Determination of pH, salinity, water temperature, water transparency SD, total nitrogen TN, total phosphorus TP, dissolved organic matter concentration DOC, chlorophyll concentration Chla and optically active substance absorption aOACs for lake water quality samples;
[0037] If pH=6.44-10.92, salinity is 0.12-117.1ppt, water temperature is 273.16-311.16K, water transparency is 0.1-24.1m, total nitrogen is 0-57.2mg / L, and total phosphorus is 0-9.3mg / L, the concentration of dissolved organic matter is 0.27-790.50mg / L and the concentration of chlorophyll is 0-1256.2μg / L, then proceed to step three;
[0038] 3. The determination of the absorption aOACs of optical characteristic substances includes the absorption ap of the total suspended matter and the abso...
specific Embodiment approach 2
[0046] Embodiment 2: The difference between this embodiment and Embodiment 1 is that in Step 1, 4-5 sampling points are set for each lake. Others are the same as in the first embodiment.
specific Embodiment approach 3
[0047] Embodiment 3: This embodiment differs from Embodiment 1 in that the measurement accuracy of pH, salinity and water body temperature in step 2 are 0.01, 0.01ppt and 0.001K respectively. Others are the same as in the first embodiment.
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Abstract
The invention discloses a method for evaluating lake eutrophication, and relates to evaluation methods of water environment pollution. The method solves the influence on TSI by multiple water qualityparameter measurement during the existing computation of the nutrition condition indexes. The method comprises the following steps: firstly, performing sampling on a lake, so as to obtain a lake waterquality sample; secondly, measuring pH, salinity, water temperature, SD, TN, TP, DOC, Chla and aOACs according to the lake water quality sample; thirdly, ensuring that the measurement of the aOACs comprises measurement of ap and aCDOM; fourthly, back calculating the TSI through the measured aOACs, ensuring that data points are uniformly distributed on the two sides of a regression line, and further performing classification of degrees of evaluating lake eutrophication. The method is simple, can compute a TSI value of a lake through a model by only measuring optical active substance absorptioncoefficients of the lake. The method is applied to the evaluation of lake eutrophication.
Description
technical field [0001] The invention relates to a method for evaluating water environment pollution, in particular to a method for evaluating the degree of eutrophication of lakes. Background technique [0002] Eutrophication of lakes means that the water quality of lakes deteriorates, and the concentration of nutrients such as nitrogen and phosphorus in the water body increases substantially, leading to an increase in lake productivity or photosynthetic rate. Eutrophication of lakes will cause a series of abnormal reactions in the aquatic ecosystem, among which algal blooms are the most common phenomenon, seriously affecting the ecological functions of lakes and water quality safety. Most lakes in my country are facing the problem of eutrophication, and it is urgent to carry out monitoring and research on the degree of eutrophication of lakes. [0003] Nowadays, the comprehensive trophic state index method (TSI) with multi-parameter correlation weighting is widely used to ...
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