Potassium thiosulfate, with the chemical formula K₂S₂O₃, has a CAS number of 10294 - 66 - 3. It is a white crystalline powder that is highly soluble in water. The product we offer is of high quality, with strict quality control measures in place during the production process to ensure its purity and stability. The purity of our potassium thiosulfate can reach over 98%, which meets the high - standard requirements of various industries.
It has a molecular weight of approximately 222.32 g/mol. In terms of physical properties, it has a density of around 2.544 g/cm³. The melting point of potassium thiosulfate is around 446 °C (decomposition). It is stable under normal storage conditions but should be kept away from strong oxidizing agents and acids to prevent chemical reactions.
Potassium thiosulfate has a wide range of applications in different fields:
It is used as a fertilizer. Potassium is an essential nutrient for plants, which can enhance plant resistance to diseases and stress, improve fruit quality and yield. Sulfur is also necessary for plant growth, participating in the synthesis of proteins and vitamins. Potassium thiosulfate can be easily absorbed by plants through the roots, providing a long - term and stable supply of potassium and sulfur nutrients.
In the traditional photography industry, potassium thiosulfate is used as a fixing agent. It can dissolve the unexposed silver halides in photographic films and papers, making the image permanent and stable.
It serves as a reducing agent in some chemical reactions. It can react with various metal ions, making it useful in metal extraction and purification processes. For example, it can be used in the recovery of precious metals such as gold and silver.
For soil application, it can be mixed with other fertilizers and evenly spread on the soil surface. The recommended application rate depends on the soil fertility, crop type, and growth stage. Generally, for common field crops, the application rate can be 10 - 20 kg per hectare. For foliar spraying, a solution with a concentration of 0.5% - 2% can be prepared and sprayed on the leaves. Make sure to spray in the early morning or late afternoon to avoid leaf burn caused by strong sunlight.
Prepare a fixing solution according to the specific formula requirements. Usually, a certain amount of potassium thiosulfate is dissolved in water, and other additives such as boric acid and potassium alum may be added. Then, immerse the photographic film or paper in the fixing solution for a certain period of time, usually 5 - 10 minutes, depending on the type of film or paper.
The usage in the chemical industry needs to be determined according to specific reaction conditions. Generally, it is added to the reaction system in a controlled manner, and the reaction temperature, pH value, and other factors should be strictly controlled.
In a wheat - growing area in the Midwest of the United States, farmers applied potassium thiosulfate as a fertilizer. They divided the farmland into two parts, one part was treated with potassium thiosulfate, and the other part was used as a control group with only traditional fertilizers. After the harvest, it was found that the wheat in the experimental group had a 15% higher yield than the control group. The wheat grains were also fuller, and the protein content was increased, indicating that potassium thiosulfate can effectively improve the yield and quality of wheat.
A professional photographer used potassium thiosulfate - based fixing solution to process his black - and - white negatives. He found that compared with other fixing agents, the potassium th
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