Hydrogen sulfide (H2S) is a toxic soluble gas that has a severe toxic effect on the organism. Insufficient iron salt, the oxygen is too low, especially the water level, the pH is lowered, and the hydrogen sulfide content is extremely too high. When the hydrogen sulfide concentration in the pond rises, after hydrogen sulfide is infiltrated into the fish, hemoglobin has lost the carrier oxygen, causing the fish tissue to malfunction, causing death. When the aquaculture hydrogen sulfide concentration is too high, hydrogen sulfide can pass through penetration and absorption into the tissue and blood of the breeding animal, combined with hemes, destroying the structure of heme, so that hemoglobin is loses the ability to combine oxygen molecules, so that blood It is chocolate as black; and hydrogen sulfide has strong stimulation and corrosion of the skin and mucous membranes of the farmers, so that the tissue has a probe necrosis.
The concentration of sulfide (sulfur) is not more than 0.2 mg / L in my country's "Fisheries Water Quality Standard". The hydrogen sulfide content in the water can affect the survival and growth of the juvenile fish. When it reaches 0.3 mg / L, it can make the squid die. In breeding, especially seedling production, the concentration of hydrogen sulfide in water should be strictly controlled below 0.02 mg / L.
Causes of hydrogen sulfide gas: hydrogen sulfide in the breeding pond is mainly produced by sulfate contained in the pond under mud, decomposing organic sulfide decomposition in the residue and fish feces produced during anaerobic process. Hydrogen sulfide is combined with metal salts to form black metal sulfides, which is why the pond submmeter is made of black.
1, sufficient oxygen, eliminate oxygen debt:
High levels of water gases can oxidize hydrogen sulfate for non-toxic substances. Highly soluble oxygen inhibits the growth of sulfate reaches of bacteria, thereby inhibiting the production of hydrogen sulfide. The oxygen generator and spills a hymnoxy agent are effective oxygenation methods.
2, improve the substrate:
The sulfate and organic sulfide in the substrate are raw materials that produce hydrogen sulfide. All two types of substances in the substance reduction can effectively reduce the production of hydrogen sulfide. Clear more than deposited in the pond, mechanically flip the substrate to improve its ventilation conditions, and put into a ferric or micro-state substrate improvement agent.
3, often change water or replenish the new water:
The addition of new water can effectively reduce the content of organic matter and hydrogen sulfide in the water. At the same time, iron elements in the new water can be precipitated with hydrogen sulfide sulfide in the water, thereby reducing the concentration of hydrogen sulfide.
4, regulate the acid alkalin (pH):
The lower the pH, the greater the hydrogen sulfide poisoning opportunity. Generally, the water pH is controlled between 7.5-8.5. If it is too low, a raw lime is applied to increase the pH, a small amount, slowly increase the pH. At the same time, it should be confirmed that molecular ammonia in water is not over, otherwise the pH is increased, which is easy to cause ammonia poisoning.
5, reasonable payment:
Try to minimize the amount of bait in the pool.
6, reasonable fertilization:
Avoid excessive propagation of algae causes inverted algae to reduce water solubol oxygen.
Finally, two water quality sensors were recommended to detect hydrogen sulfide concentrations in aquaculture, which was analyzed by the design of Water Silk Sensor-H2S, completely dissolved sulfide (dissolved H2S, HS and S2) from Germany. One of the most important parameters of natural water and wastewater in the industry. Due to the evaporation of toxic H2S, in order to avoid any hazard, the concentration of sulfide dissolved in water must be observed to avoid any danger. The H2S can prevent oxygen transmission enzyme that causes death due to internal focus. On the other hand, a fully dissolved sulfide concentration is a very interesting parameter for scientists of several science sectors. They use this parameter to assess the natural lake, but can also be used to understand volcanic activities.
Finally, the hydrogen sulfide sensor-H2S sensor, the H2S sensor is based on electrochemical amps method, and the hydrogen sulfide (H2S) / sulfide dissolved in natural water can be rapidly analyzed on site. The H2S gas diffuses into the sensor by a gas permeability film, and then an oxidation reaction occurs on the surface of the working electrode in the sensor, and quantitative analysis is performed by recording the current signal associated with the H2S content. When the H2S / sulfide concentration (pH 5 - 8.5) is measured, the pH of the sample and the temperature value are required, and the output signal of the sensor is compensated by the electronic device, the measured value is corrected with the temperature of the temperature (temperature compensation) . The sensor can be applied to measurements of on-site water depth of 100 meters, and can also be used in laboratory testing. Read more
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