Degradation agent of compound sodium polythiocarbonate preparation for degrading nitrite in aquatic water and preparation method of degradation agent

Abstract

The invention provides a compound sodium polythiocarbonate preparation degradation agent for degrading nitrite in aquatic water. The compound sodium polythiocarbonate preparation degradation agent comprises the following components in percentage by mass: 3-11% of sodium trithiocarbonate, 12-40% of sodium pentathiocarbonate and the balance of purified water. The invention also provides a preparation method and application of the degradation agent for degrading nitrite in the aquatic water by using the compound sodium polythiocarbonate preparation. The compound sodium polythiocarbonate nitrite degradation agent prepared by the invention has the characteristics of long-acting effect, safety, no toxicity, no side effect, no residue, no pollution, no rebound, environmental friendliness, stable aquaculture water quality and the like, the effective degradation rate of the degradation agent on the nitrite in aquaculture reaches 93.2% or above, and meanwhile, the degradation agent can be used for degrading the nitrite in aquaculture in manners of chelation, capture, sedimentation and the like. Heavy metals such as arsenic, mercury, lead, cadmium, chromium and copper in a water body can be effectively removed, the food quality of aquatic animals is improved, the food safety of the aquatic animals is guaranteed, and the body health of people is maintained.

Description

Technical Field

[0001] The invention relates to the field of aquaculture, and in particular to a compound sodium polythiocarbonate preparation for degrading nitrite in aquaculture water and a preparation method thereof. Background Art

[0002] In current aquaculture waters, due to the large amount of feed being fed, the amount of residual feed in aquaculture increases, and the amount of excrement excreted increases, which in turn causes a large amount of nitrogen accumulation. Nitrogen is converted into ammonia nitrogen, nitrite nitrogen and nitrate nitrogen through the action of various microorganisms. On the one hand, these three types of nitrogen are absorbed by algae and aquatic plants. On the other hand, under certain conditions, nitrate nitrogen converts nitrate nitrogen into nitrogen gas through denitrification, which escapes from the water body into the atmosphere. If the aquaculture water body reaches a certain self-purification balance state, without external interference (such as the use of disinfectants), the nitrogen cycle of the water body will proceed smoothly and normally, and continue to be in a stable state.

[0003] On the other hand, a large amount of leftover bait and feces in high-density, high-intensity, and intensive aquaculture consumes oxygen in the water, causing a decrease or lack of dissolved oxygen (DO) in the water. In this way, pathogenic microorganisms will grow and multiply in large numbers, thereby invading farmed animals, which manifests as infection or disease in farmed animals. The use of disinfectants is the only way to kill pathogens. However, frequent and excessive use of disinfectants kills all beneficial microorganisms and pollutant digesters (nitrifying bacteria and nitrite bacteria) in the water, and the content of toxic and harmful substances - ammonia nitrogen and nitrite increases sharply.

[0004] Excessive nitrite in aquaculture water is highly toxic to farmed animals. Its mechanism of action is: through the respiration of fish and shrimp, it enters the blood through the gill filaments, oxidizing normal hemoglobin into methemoglobin. Methemoglobin cannot combine with oxygen, causing the blood's ability to transport oxygen to decrease. Even if the aquaculture water is rich in oxygen, it is easy to cause insufficient oxygen supply to the body's tissues, leading to hypoxia in fish and shrimp, stress response, and even suffocation and death of fish and shrimp.

[0005] The harm of nitrite to fish and shrimp is mainly reflected in: 1. Reducing the oxygen supply capacity of aquatic animals; 2. Disrupting the K+ concentration inside and outside the body cells, causing it to be unbalanced, thereby destroying the functions of nervous system transmission, skeletal muscle contraction, etc., and reducing the vitality of aquatic animals; 3. Destroying the function of the immune system and reducing the resistance of aquatic animals to pathogens.

[0006] Nitrite in aquaculture water is very toxic and has a strong toxic effect on aquatic animals. When the nitrite concentration in the water reaches or exceeds 0.15mg / L, it is easy to cause nitrite poisoning, and its symptoms are: anorexia, slow swimming, slow reaction, rapid breathing, floating on the surface to breathe, darker body color, and dark red gill filaments. Therefore, aquaculture must control the concentration of nitrite, otherwise there will be endless troubles.

[0007] Degrading nitrite has always been a difficult problem in aquaculture production, and nitrite poisoning often brings serious economic losses to farmers. In production practice, there is no specific drug that can quickly degrade nitrite, but a variety of methods and measures can be taken to alleviate and reduce nitrite concentration.

[0008] At present, the methods for degrading nitrite in aquaculture are as follows: ① By turning on the aerator or spraying chemical oxygenators throughout the pond, the dissolved oxygen in the aquaculture water is increased to accelerate the conversion of nitrite to nitrate, thereby reducing the nitrite content in the water. ② Degrading nitrite through microorganisms, using microbial preparations such as Bacillus, photosynthetic bacteria, nitrifying bacteria, and denitrifying bacteria to degrade nitrite. ③ Using water quality regulators composed of ammonium ion chelating agents, activated carbon, adsorbents, etc., through ion exchange, adsorb or degrade nitrite. ④ Oxidative decomposition of nitrite with strong oxidants.

[0009] The above-mentioned degradation of nitrite is mainly through oxidation, decomposition, chelation, adsorption and other methods, which are high in cost and low in efficiency and cannot meet the requirements of modern high-yield aquaculture production.

[0010] Based on the needs of aquaculture production, it is of great significance to develop a new type of nitrite degradation product that is simple, effective, easy to use, and environmentally friendly. Summary of the invention

[0011] In view of the above-mentioned deficiencies in the prior art, the present invention provides a compound sodium polythiocarbonate preparation for degrading nitrite in aquaculture water and a preparation method thereof. The nitrite degrading agent prepared by the present invention has the characteristics of long-term, environmentally friendly, efficient, safe, non-toxic, no side effects, no residue, no pollution, no rebound, environmentally friendly, stable aquaculture water quality, etc., and the effective degradation rate of aquaculture nitrite is more than 93.2%, and at the same time, it can effectively remove heavy metals such as arsenic, mercury, lead, cadmium, chromium, copper, etc. in water, greatly improving the food quality of aquatic animals, ensuring the food safety of aquatic animals, and maintaining people's health.

[0012] The product of the invention has simple preparation and use methods, economical and practical formula, stable and reliable effect, and is suitable for factory production.

[0013] The present invention adopts the following technical scheme:

[0014] A compound sodium polythiocarbonate preparation is a degradation agent for degrading nitrite in aquaculture water, which comprises the following components by mass percentage: 3%-11% sodium trithiocarbonate, 12%-40% sodium pentathiocarbonate, and the balance is pure water.

[0015] A method for preparing a compound sodium polythiocarbonate preparation for degrading nitrite in aquaculture water. The preparation comprises 3%-11% sodium trithiocarbonate, 12%-40% sodium pentathiocarbonate and the remainder pure water in a liquid mixer and mixed for 15-30 minutes. The mixture is placed for 0.5-1 hour and then canned into a 500ml or 1000ml product and affixed with instructions for use.

[0016] A method for using the composite sodium polythiocarbonate preparation as claimed in claim 1 to degrade nitrite in aquaculture water. For aquaculture water, use 100-400 ml per acre of 1 meter water depth. When using, dilute with pond water and spray the whole pond. Use in the morning on sunny days.

[0017] Furthermore, nitrite in water can be degraded by 0.3-0.5ppm within 72-96 hours after use.

[0018] By using the nitrite degradation agent prepared by the present invention, the nitrite in the aquaculture water body can be degraded to 93.2% of the nitrite content within 72-96 hours, and the nitrite concentration can be reduced to a safe range within 48 hours. The aquaculture water body nitrite compound sodium polythiocarbonate degradation agent prepared by the present invention is suitable for all aquaculture water bodies, including seawater aquaculture and freshwater aquaculture, and is suitable for all seawater and freshwater aquaculture species such as fish, shrimp, crab, frog, shellfish, etc. DETAILED DESCRIPTION

[0019] The technical solution of the present invention will be clearly and completely described below in conjunction with this specific embodiment.

[0020] In aquaculture water ecosystems, nitrite is a dynamic process, constantly produced and transformed. However, if environmental conditions change, such as lower temperature, reduced dissolved oxygen or water quality changes (disinfection), nitrite will accumulate and increase rapidly, which can easily cause harm to fish and shrimp.

[0021] The inventors have found through research in the process of realizing the present invention that the use of a compound sodium polythiocarbonate preparation (sodium trithiocarbonate, sodium pentathiocarbonate) can inhibit the conversion of ammonia nitrogen in aquaculture water into nitrite (nitrate nitrogen), thereby blocking the production of nitrite and achieving the effect of reducing nitrite. It has been found in the research that the use of sodium trithiocarbonate or sodium pentathiocarbonate alone also has the effect of inhibiting the production of nitrite, but the effect is unstable, easy to rebound, the effective time is short, and it strongly stimulates the gills of fish and shrimp, resulting in a stress response. In severe cases, fish and shrimp will die in large numbers, causing losses to the production of farmers.

[0022] The present invention uses sodium trithiocarbonate and sodium pentathiocarbonate. From 2021 to 2024, it has undergone several technical solution adjustments and formula adjustments, from a single sodium trithiocarbonate or sodium pentathiocarbonate, to a compound formula, to a compound formula with added detoxification and synergist, and has been continuously improved, overcoming the defects of easy rebound, instability, high irritation, and easy drug resistance compared to other similar products. Among similar products, the present invention is superior to other similar products.

[0023] Example 1

[0024] A compound sodium polythiocarbonate degrading agent for degrading nitrite in aquaculture water, which is composed of 10% sodium trithiocarbonate, 15% sodium pentathiocarbonate and 75% pure water in mass percentage. The mixture is put into a liquid mixer and mixed for 15-30 minutes, and then placed for 0.5-1 hour, and then canned into a 500ml product with instructions for use attached.

[0025] During the test, dilute with pool water and evenly spray throughout the pool. Measure the nitrite concentration (ppm) before use and re-measure the nitrite concentration (ppm) 72 hours after use. The test results are shown in Table 1:

[0026] Table 1 Degradation agent testing from May to August 2021

[0027]

[0028] Example 2

[0029] A degradation agent for degrading nitrite in aquaculture water using a compound sodium polythiocarbonate preparation. 6% sodium trithiocarbonate, 20% sodium pentathiocarbonate, and 74% purified water, measured by mass percentage, are placed in a liquid mixer and mixed for 15-30 minutes. After standing for 0.5-1 hour, the product is canned into 500ml and an instruction manual is attached. During the test, the water is dissolved and evenly sprinkled throughout the pond. The nitrite concentration (ppm) is measured before use and the nitrite concentration (ppm) is re-measured 72-96 hours after use. The test results are shown in Table 2:

[0030] Table 2 Degradation agent testing from June to August 2022

[0031]

[0032] Example 3

[0033] A compound sodium polythiocarbonate preparation is a degradation agent for degrading nitrite in aquaculture water. 4% sodium trithiocarbonate, 25% sodium pentathiocarbonate and 71% pure water, measured by mass percentage, are put into a liquid mixer and mixed for 15-30 minutes. After being left for 0.5-1 hour, the product is canned into 500ml and an instruction manual is attached.

[0034] During the test, dilute with pool water and evenly sprinkle throughout the pool. Measure the nitrite concentration (ppm) before use and re-measure the nitrite concentration (ppm) 72-96 hours after use. The test results are shown in Table 3:

[0035] Table 3 Degradant testing results from April to September 2023

[0036]

[0037] Example 4

[0038] A compound sodium polythiocarbonate preparation is a degradation agent for degrading nitrite in aquaculture water. 3% sodium trithiocarbonate, 30% sodium pentathiocarbonate and 67% pure water, measured by mass percentage, are put into a liquid mixer and mixed for 15-30 minutes. After being left for 0.5-1 hour, the product is canned into 500ml and an instruction manual is attached.

[0039] During the test, dilute with pool water and evenly sprinkle throughout the pool. Measure the nitrite concentration (ppm) before use and re-measure the nitrite concentration (ppm) 72-96 hours after use. The test results are shown in Table 4:

[0040] Table 4 Degradation agent testing results from May to July 2024

[0041]

[0042] The nitrite detection method is a colorimetric test with a special reagent. The test should be performed within 72-96 hours after use.

[0043] The nitrite degradation agent for aquaculture water prepared by the present invention is used in an amount of 150-400 ml per mu of 1 meter water depth according to the concentration of nitrite.

[0044] Repeated tests on large-scale aquaculture water bodies from 2021 to 2024 showed that the nitrite concentration ranged from 0.2ppm to 0.8ppm. After applying the nitrite compound sodium polythiocarbonate degrader of the present invention, the degradation rate could reach 93.2% within 72-96 hours. However, in 6.8% of the aquaculture water bodies, the effect was not obvious, which may be related to the bottom soil and water quality (dissolved oxygen) of the aquaculture water bodies.

[0045] After using the nitrite compound sodium polythiocarbonate degradation agent of the present invention, the water quality of the aquaculture water body is significantly improved and becomes clear, and the water color changes from black to yellow-green, achieving high-quality water quality for aquaculture that is fat, active, tender and refreshing.

[0046] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A compound sodium polythiocarbonate preparation for degrading nitrite in aquaculture water, characterized in that: The composition comprises the following components by mass percentage: 3%-11% sodium trithiocarbonate, 12%-40% sodium pentathiocarbonate, and the balance is pure water.

2. A method for preparing a compound sodium polythiocarbonate preparation for degrading nitrite in aquaculture water, characterized in that: 3% - 11% sodium trithiocarbonate, 12% - 40% sodium pentathiocarbonate and the balance pure water are put into a liquid mixer and mixed for 15 - 30 minutes. After standing for 0.5 - 1 hour, the product is canned into 500ml or 1000ml.

3. A method for using the composite sodium polythiocarbonate preparation as claimed in claim 1 to degrade nitrite in aquaculture water, characterized in that: For aquaculture water bodies, use 100-400ml per acre of 1 meter water depth. Dilute with pond water when using, and spray throughout the pond. Use in the morning on sunny days.

4. The method for using the composite sodium polythiocarbonate preparation as a degradation agent for degrading nitrite in aquaculture water as claimed in claim 3, characterized in that: 72-96 hours after use, the nitrite in the water can be degraded to 0.3-0.5ppm.

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