Determination method for phosphorus endogenous load of lake sediment

By using sediment stratification sampling and the phosphorus-molybdenum blue spectrophotometer method to determine the phosphorus content in sediments, and combining this with Frick's first law to calculate the phosphorus diffusion rate, the problem of inaccurate determination of phosphorus load in lake sediments in existing technologies has been solved, thus providing a more accurate basis for lake eutrophication management.

CN121475952APending Publication Date: 2026-02-06HEBEI NORTH UNIV
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Patent Information

Application Number
CN202511660964.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-11-13
Publication Date
2026-02-06

AI Technical Summary

Technical Problem

The lack of a more accurate and comprehensive method for measuring phosphorus loading in lake sediments has resulted in a lack of reliable basis for eutrophication control measures.

Method used

Sediment columnar samples were collected using a sediment stratification sampler, and the phosphorus content in the sediments was determined using the phosphomolybdenum blue spectrophotometer method. The phosphorus diffusion rate was determined using an in-situ sediment-water interface water quality sampler, and the phosphorus loading in the sediments was calculated using Frick's first law. The phosphorus concentrations in the overlying water and interstitial water were analyzed using exponential fitting and Origin software.

Benefits of technology

It enables a more accurate and comprehensive reflection of the phosphorus load status in lake sediments, provides standardized evaluation indicators, and offers a reliable basis for lake eutrophication control and ecological protection.

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Abstract

The invention discloses a method for measuring phosphorus endogenous load of lake sediments. The method comprises the following steps: 1) measuring phosphorus reserve of the sediments; (2) calculating the phosphorus reserve of the sediments of the polluted layer; (3) measuring and calculating the phosphorus diffusion rate of the sediments; (4) calculating the phosphorus internal load of the sediments, wherein the calculation formula is N = m * Fd2; in the formula, N is the phosphorus internal load (unit: n) of the sediment, m is the phosphorus reserve (g) of the sediment of the pollution layer, and Fd is the phosphorus diffusion rate (mg.m <-2 >. D <-1 >) of the sediment. According to the method, the state of the phosphorus internal load of the lake sediment can be reflected more accurately and comprehensively, the evaluation index of the phosphorus internal load of the lake sediment is more standardized, and a reliable basis is provided for lake eutrophication control engineering measures and lake basin ecological protection formulating measures.
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