What are the environmental fate and transport of the chemical with CAS 108-59-8?

The chemical with CAS 108 - 59 - 8 is dimethyl maleate, a colorless to pale - yellow liquid with a characteristic odor. As a supplier of this chemical, I am well - aware of the importance of understanding its environmental fate and transport. This knowledge not only helps in ensuring proper handling and storage but also contributes to minimizing its potential environmental impacts.

Physical and Chemical Properties

Dimethyl maleate has a molecular formula of C₆H₈O₄ and a molecular weight of 144.13 g/mol. It is soluble in many organic solvents such as ethanol, benzene, and acetone, and has a solubility in water of about 20 g/L at 20 °C. Its vapor pressure is 0.021 mmHg at 25 °C, which indicates that it can exist in the gas phase under certain environmental conditions. The boiling point of dimethyl maleate is 204 - 205 °C, and its melting point is about - 19 °C.

Environmental Fate

Atmospheric Fate

In the atmosphere, dimethyl maleate can undergo several processes. It can react with hydroxyl radicals (·OH), which are the most important oxidizing agents in the troposphere. The reaction rate constant of dimethyl maleate with hydroxyl radicals is estimated to be in the range of 10⁻¹¹ - 10⁻¹² cm³ molecule⁻¹ s⁻¹. This reaction leads to the formation of various degradation products, including aldehydes, ketones, and carboxylic acids. The half - life of dimethyl maleate in the atmosphere due to reaction with hydroxyl radicals is estimated to be on the order of hours to days, depending on the hydroxyl radical concentration.

Another important process in the atmosphere is photolysis. Although dimethyl maleate does not absorb strongly in the solar - UV region (290 - 400 nm), it may still undergo photochemical reactions under certain conditions, especially in the presence of other photosensitizing compounds.

Aquatic Fate

When dimethyl maleate enters an aquatic environment, its solubility in water allows it to be distributed throughout the water column. It can undergo hydrolysis, a chemical reaction with water. The hydrolysis rate of dimethyl maleate is pH - dependent. Under acidic or basic conditions, the hydrolysis reaction is accelerated. In neutral water, the half - life of dimethyl maleate hydrolysis is relatively long, but it can be significantly reduced in acidic or alkaline solutions.

Biodegradation is also an important process in the aquatic environment. Microorganisms in water can use dimethyl maleate as a carbon and energy source. Aerobic biodegradation is more efficient than anaerobic biodegradation. Studies have shown that dimethyl maleate can be biodegraded to carbon dioxide, water, and biomass under aerobic conditions. However, the biodegradation rate may be affected by factors such as temperature, nutrient availability, and the presence of other pollutants.

Soil Fate

In soil, dimethyl maleate can adsorb to soil particles. The adsorption is mainly influenced by the organic matter content and the clay content of the soil. Soils with high organic matter and clay content tend to have a higher adsorption capacity for dimethyl maleate. Once adsorbed, the mobility of dimethyl maleate in the soil is reduced.

Similar to the aquatic environment, biodegradation also occurs in the soil. Soil microorganisms can break down dimethyl maleate, and the rate of biodegradation depends on soil moisture, temperature, and the type of microorganisms present. In addition, dimethyl maleate can also volatilize from the soil surface into the atmosphere, especially in warm and dry conditions.

Environmental Transport

Atmospheric Transport

Dimethyl maleate can be transported in the atmosphere by wind. Its relatively low vapor pressure means that it is not as volatile as some other chemicals, but it can still be carried over long distances in the gas phase. Atmospheric transport can lead to the spread of dimethyl maleate from its source area to other regions, potentially affecting air quality and ecosystems far from the original release point.

Aquatic Transport

In aquatic systems, dimethyl maleate can be transported by water flow. In rivers, it can be carried downstream, and in lakes and oceans, it can be dispersed by currents. The dissolved form of dimethyl maleate moves with the water, and suspended or adsorbed forms may also be transported along with sediment particles.

Soil Transport

In soil, dimethyl maleate can be transported vertically through the soil profile due to infiltration and percolation of water. It can also be transported laterally in the soil, especially in areas with high water flow rates. Agricultural practices such as irrigation can increase the transport of dimethyl maleate in the soil.

Implications for Our Business

As a supplier of dimethyl maleate, understanding its environmental fate and transport is crucial for several reasons. Firstly, we need to ensure that our storage and handling facilities are designed to prevent any accidental releases of the chemical into the environment. This includes proper containment systems and spill response plans.

Secondly, we can provide our customers with information on the proper use and disposal of dimethyl maleate to minimize its environmental impact. For example, we can recommend that customers follow best - practice guidelines for handling chemicals in the workplace and that they dispose of any waste containing dimethyl maleate in accordance with local regulations.

In addition, we are committed to continuous improvement in our environmental management. We support research on the environmental fate and transport of dimethyl maleate to develop more accurate models and prediction tools. This knowledge will help us to better manage our operations and reduce the potential risks associated with the chemical.

If you are interested in purchasing dimethyl maleate or other related chemicals, we encourage you to [contact us for procurement and negotiation]. We also offer a wide range of other high - quality organic chemicals, such as 4 - Methylphenylacetic Acid/p - Tolylacetic Acid CAS 622 - 47 - 9, 2 2 - BIS[4 - (4 - AMINOPHENOXY)PHENYL]HEXAFLUOROPROPANE CAS 69563 - 88 - 8, and 4 - Cyanopyridine CAS 100 - 48 - 1. Our team of experts is ready to assist you in finding the right chemicals for your specific needs.

References

Howard, P. H., & Meylan, W. M. (1997). Handbook of physical properties estimation methods for organic compounds: environmental behavior and fate. CRC press.
Lide, D. R. (Ed.). (2007). CRC handbook of chemistry and physics. CRC press.
Schwarzenbach, R. P., Gschwend, P. M., & Imboden, D. M. (2003). Environmental organic chemistry. Wiley - Interscience.