A kind of digestion device and its application method for the determination of total nitrogen in pond sediment

A sediment and digestion technology, applied in the field of fishery ecological environment research of aquaculture discipline, can solve the problems of air pollution, difficulty of digestion device, inability to absorb poisonous gas, etc., and achieve the effect of easy storage, easy assembly and simple operation

Inactive Publication Date: 2017-02-22
FRESHWATER FISHERIES RES CENT OF CHINESE ACAD OF FISHERY SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Digestion units for total nitrogen determination in sediments are particularly difficult
The digestion reagents are generally potassium sulfate, copper sulfate and concentrated sulfuric acid. Although the above reagents have good oxidation effects during the digestion process, they are prone to generate a large amount of sulfur dioxide gas. It is absorbed in time, and the untreated toxic gas is directly discharged to the outside through absorption, which is also likely to cause serious air pollution

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  • A kind of digestion device and its application method for the determination of total nitrogen in pond sediment

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Effect test

Embodiment 1

[0023] Such as figure 1 Shown, a kind of digestion device that is used for pond sediment total nitrogen determination comprises electric furnace 1, digestion pipe 2, first container 4, second container 6, condenser 7, adsorption pipe 10 and vacuum pump 11;

[0024] The electric furnace 1 is provided with several digesting pipes 2, and the several digesting pipes 2 are communicated through the air intake pipe 3 and then lead to below the liquid level of the first container 4; the first container 4 and the second container 6 pass through the first container 4 A gas outlet pipe 5 is connected, and the first gas outlet pipe 5 leads to the bottom of the second container 6;

[0025] The second container 6 is connected to the condenser 7 through a second outlet pipe 8; the second container 6 is connected to an adsorption pipe 10 and a vacuum pump 11 through a pipeline 9 in sequence.

[0026] The digestion pipes 2 are provided with corresponding digestion pipe covers 12, and the dige...

Embodiment 2

[0032] The method of using the digestion device for the determination of total nitrogen in pond sediments, the steps are as follows:

[0033] (1) Pretreatment: freeze-dry the sediment to be digested at -40°C for 10 hours, and then pass through a 90-mesh sieve to obtain a sediment sample;

[0034] (2) Adding samples: Add 0.4g of the sediment sample obtained in step (1) to each digestion tube 2, then add 1.8g of mixed oxidant, mix well, and then add 4mL of concentrated sulfuric acid with a mass concentration of 98%;

[0035] (3) Digestion: Close the digestion tube cover 12 and the digestion tube 2 tightly, turn on the electric furnace below, heat to 150-200°C for 1.5 hours, and cook until the liquid in the tube is clear and transparent;

[0036] (4) Tail gas treatment: turn on the vacuum pump 11, and the pumping pressure is 10MPa. The tail gas generated by the reaction of the digestion pipe 2 first enters the sodium hydroxide solution in the first container 4 through the intake ...

Embodiment 3

[0039] The method of using the digestion device for the determination of total nitrogen in pond sediments, the steps are as follows:

[0040] (1) Pre-treatment: The sediment to be digested was freeze-dried at -80°C for 5 hours, and then passed through a 110-mesh sieve to obtain a sediment sample;

[0041] (2) Adding samples: Add 0.6g of the sediment sample obtained in step (1) to each digestion tube 2, then add 2.2g of mixed oxidant, mix well, and then add 6mL of concentrated sulfuric acid with a mass concentration of 95%;

[0042] (3) Digestion: Close the digestion tube cover 12 and the digestion tube 2 tightly, turn on the lower electric furnace, heat to 200-300°C for 0.5h, and digest until the liquid in the tube is clear and transparent;

[0043] (4) Tail gas treatment: turn on the vacuum pump 11, and the pumping pressure is 30 MPa. The tail gas generated by the reaction of the digestion pipe 2 first enters the sodium hydroxide solution in the first container 4 through the ...

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Abstract

The invention relates to a digestion device for measuring total nitrogen in pond sediments and a using method of the digestion device for measuring the total nitrogen in the pond sediments, and belongs to the technical field of ecological environment research in aquaculture subject fishery. The digestion device comprises an electric furnace, digestion pipes, a first container, a second container, a condenser, an adsorption pipe and a vacuum pump, wherein multiple digestion pipes are arranged on the electric furnace and are communicated with one another by virtue of air inlet pipelines so as to stretch into below the liquid surface in the first container; the first container and the second container are connected by virtue of a first air outlet pipe; the first air outlet pipe stretches into the bottom of the second container; the second container and the condenser are connected by virtue of a second air outlet pipe; and the second container is sequentially connected with the adsorption pipe and the vacuum pump by virtue of pipelines. The whole measurement process is finished after pretreatment, sampling, digestion and tail gas treatment are finished. The digestion device disclosed by the invention comprises a digestion utensil and also contains a whole set of digestion tail gas treatment device, and the digestion process can be normally finished even if a ventilating hood is not used. The device provided by the invention is easy to operate, rapid, safe and free of pollution.

Description

technical field [0001] The invention relates to a digestion device for measuring total nitrogen in pond sediments and an application method thereof, belonging to the technical field of fishery ecological environment research in the subject of aquaculture. Background technique [0002] It is extremely important for aquaculture practitioners and scientific researchers to master the changing laws of physical and chemical indicators of pond water quality. For example, knowing the level of dissolved oxygen in a timely manner can help judge whether the aerator needs to be turned on in the next step of breeding activities to prevent fish from dying due to hypoxia; the increase of total nitrogen and total phosphorus is the cause of eutrophication in pond water, which can help In order to carry out artificial intervention on the water body in time to prevent the excessive reproduction of harmful algae, in order to achieve the purpose of accurately cultivating the water quality of the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/44
Inventor 陈家长范锋裘丽萍刘颖宋超
Owner FRESHWATER FISHERIES RES CENT OF CHINESE ACAD OF FISHERY SCI
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