Ammonium thiosulfate, with the CAS number 7783 - 18 - 8, is a colorless to pale - yellow liquid or white crystalline solid. Its chemical formula is (NH₄)₂S₂O₃. The molar mass of ammonium thiosulfate is approximately 148.205 g/mol. It has a high solubility in water, which makes it easy to handle in various applications. The density of a typical ammonium thiosulfate solution is around 1.67 g/cm³. It is stable under normal conditions but may decompose when exposed to strong acids or high temperatures.
Ammonium thiosulfate has a wide range of applications in different industries:
Uso agrícola: When using ammonium thiosulfate as a fertilizer, it can be applied through different methods. It can be mixed with water and sprayed onto the soil surface or used in a fertigation system. The recommended application rate depends on the soil type, crop type, and nutrient requirements. Generally, for field crops, an application rate of 10 - 20 kg per hectare may be appropriate.
Uso fotográfico: In photography, ammonium thiosulfate is typically used in a fixing solution. The fixing solution should be prepared according to the manufacturer's instructions. Usually, a certain amount of ammonium thiosulfate is dissolved in water, and other additives may be added to optimize the fixing process. The photographic film or paper is then immersed in the fixing solution for a specific period, which is usually a few minutes, depending on the type of material and the fixing conditions.
Uso en la industria química: In chemical reactions, the dosage of ammonium thiosulfate is determined by the stoichiometry of the reaction. It should be added slowly to the reaction mixture under appropriate reaction conditions, such as temperature and pH control, to ensure the reaction proceeds smoothly.
Caso agrícola: In a large - scale wheat farm in the Midwest of the United States, the farmers used ammonium thiosulfate as a fertilizer additive. Before using ammonium thiosulfate, the wheat yields were relatively low, and the plants showed symptoms of sulfur deficiency, such as yellowing leaves. After applying ammonium thiosulfate at a rate of 15 kg per hectare through a fertigation system, the wheat plants showed significant improvement. The leaves became greener, and the root systems were more developed. At the harvest time, the wheat yields increased by 15% compared to the previous year, and the protein content in the wheat also improved.
Maletín fotográfico: A small - scale photography studio used ammonium thiosulfate in its fixing solutions. They had been using a traditional fixing agent but found that the fixing process was slow and the quality of the fixed images was not satisfactory. After switching to ammonium thiosulfate - based fixing solution, the fixing time was reduced from 10 minutes to 5 minutes, and the fixed images had better clarity and less residual silver halides, resulting in higher - quality prints.
Caso de la industria química: A chemical plant was dealing with heavy - metal - contaminated wastewater. They used ammonium thiosulfate as a reducing agent to precipitate heavy metals such as lead and mercury.
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