Method for measuring contents of total nitrogen and total phosphorus contained in seawater substrate sludge by adopting combined digestion

A method of determination, a technology of phosphorus content, applied in the direction of material analysis by observing the influence of chemical indicators, and analysis by making materials undergo chemical reactions, etc., can solve the problems of no public literature reports, etc., and achieve accuracy High efficiency, improved work efficiency, easy and quick operation
CN102175683AInactive Publication Date: 2011-09-07CENT LAB TIANJIN ACADEMY OF AGRI SCI
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
CENT LAB TIANJIN ACADEMY OF AGRI SCI
Publication Date
2011-09-07
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a method for measuring the contents of total nitrogen and total phosphorus contained in seawater substrate sludge by adopting combined digestion, comprising the following steps of: weighing 1.0 g of air-dried sample screened through a phi 0.5 mm sieve; adding 8 mL of sulfuric acid and 2 mL of hydrogen peroxide, carefully and uniformly shaking, and placing overnight; slowly increasing temperature till the sulfuric acid is smoky; slightly cooling, then adding a plurality of drops of hydrogen peroxide, and continuously heating till the solution is colourless or off-white; slightly cooling, adding water, and heating to boiling; taking down for cooling, nondestructively transferring a digested solution into a 100 mL volumetric flask, adding water, fixing volume, and standing for clarification or filtering by using phosphate-free filter paper; then sucking 10.0 mL of sample solution containing 0.05-1.0 mg of the phosphorus into a 50 mL volumetric flask, adding water to 20-30 mL, carrying out color development and color comparison with a standard solution series under same conditions, and reading absorbance; and carrying out a control experiment by respectively using standard substances, i.e. ammonium sulfate and monopotassium phosphate to measure the contents of the total nitrogen and the total phosphorus which are contained in the seawater substrate sludge. The measuring method has high accuracy and easiness, convenience and fastness for operation and is suitable for batched measurement, thereby enhancing the work efficiency.
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Description

Technical field

[0001] The invention belongs to the technical field of marine research and environmental protection. It involves the analysis method of total nitrogen and total phosphorus content in sea bottom mud. More specifically, it is a method that uses joint digestion to determine the total nitrogen and total phosphorus content of seabed mud. Background technique

[0002] With the rapid development of the world economy, a large number of pollutants produced by humans are discharged into water bodies and gradually accumulate in the bottom sludge, causing the bottom sludge to be polluted to varying degrees. Among them, nitrogen and phosphorus are important elements of aquatic ecosystems. Excessive input can lead to eutrophication of water bodies and trigger red tides. A large part of the nutrients in nearshore water bodies comes from the exchange of materials between sediments and overlying water. The exchange and diffusion of nutrient elements at the material-water interfa...

Claims

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