Diethylenetriaminepentaacetic Acid (DTPA - ACID), with the CAS number 67 - 43 - 6, is a high - quality chemical product available at a low price. It has the molecular formula C₁₄H₂₃N₃O₁₀ and a molecular weight of approximately 393.35 g/mol. DTPA - ACID is a white crystalline powder that is soluble in water and has a slightly acidic taste. It is a polyamino carboxylic acid with excellent chelating properties, which can form stable complexes with various metal ions, such as calcium, magnesium, iron, copper, and zinc.
1. **Medical Field**: DTPA - ACID is used in the treatment of heavy metal poisoning. It can chelate with heavy metal ions in the body, forming stable complexes that can be excreted through the kidneys, thus reducing the toxicity of heavy metals. For example, it is used to treat patients exposed to radioactive metals like plutonium, americium, and curium.
2. **Industrial Applications**: In the industrial sector, it is widely used as a chelating agent in water treatment, textile dyeing, and papermaking. In water treatment, it can prevent the precipitation of metal salts, thus preventing scaling and corrosion in pipes and equipment. In textile dyeing, it can improve the color fastness of dyes by chelating metal ions in the water that may affect the dyeing process.
3. **Agricultural Field**: It can be used as a micronutrient fertilizer synergist. By chelating metal micronutrients, it can improve the bioavailability of these nutrients in the soil, promoting plant growth and increasing crop yields.
1. **Medical Use**: When used in the medical field, DTPA - ACID is usually administered through intravenous injection under the supervision of medical professionals. The dosage and treatment duration depend on the type and severity of heavy metal poisoning.
2. **Industrial Use**: In industrial applications, the appropriate amount of DTPA - ACID is added to the relevant process according to the specific requirements. For example, in water treatment, the dosage is determined based on the concentration of metal ions in the water. It is usually added in the form of an aqueous solution, and the pH value of the solution may need to be adjusted to ensure the best chelating effect.
3. **Agricultural Use**: In agriculture, it can be mixed with fertilizers and applied to the soil. The recommended dosage varies depending on the type of soil and crops. It is important to ensure uniform distribution in the soil to achieve the best results.
1. **Medical Case**: A patient was accidentally exposed to radioactive plutonium during a nuclear power plant accident. Doctors immediately administered DTPA - ACID through intravenous injection. After a series of treatments, the level of plutonium in the patient's body decreased significantly, and the patient's health gradually recovered. The successful treatment not only demonstrated the effectiveness of DTPA - ACID in chelating radioactive metals but also saved the patient's life.
2. **Industrial Case**: A textile dyeing factory was experiencing problems with color unevenness and poor color fastness. After adding an appropriate amount of DTPA - ACID to the dyeing process, the chelation of metal ions in the water improved the dye - fiber binding, resulting in more uniform colors and better color fastness. This significantly improved the quality of the dyed textiles and increased the market competitiveness of the factory.
3. **Agricultural Case**: A farmer applied DTPA - ACID - chelated micronutrient fertilizers to his orchard. The treated fruit trees showed stronger growth, more abundant foliage, and higher fruit yields. The improved bioavailability of micronutrients in the soil promoted the overall health of the trees and the quality of the fruits.
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