The Evolution and Significance of CAS Numbering A Focus on CAS 124-04-9

In the vast realm of chemistry, the identification and categorization of chemical substances play a critical role in research, regulation, and commercial applications. One of the most essential tools for this purpose is the Chemical Abstracts Service (CAS) registry number, a unique numerical identifier assigned to every chemical substance that is described in the literature. This article will delve into the intricacies of CAS numbering, with a particular focus on the chemical substance represented by CAS 124-04-9, commonly known as 1,4-Dichlorobenzene.

Understanding CAS Numbers

A CAS number is a proprietary identification number assigned by the Chemical Abstracts Service, a division of the American Chemical Society. This numbering system allows for the precise identification of chemical substances, irrespective of their names. Each CAS number is unique and consists of up to ten digits, divided into three segments by hyphens. The primary purpose of the CAS number is to eliminate ambiguity in the identification of chemicals, facilitating communication and information sharing among researchers, regulators, and industry professionals.

CAS 124-04-9 refers to 1,4-Dichlorobenzene, a chlorinated aromatic hydrocarbon. This chemical is characterized by a benzene ring where two of the hydrogen atoms have been replaced by chlorine atoms in the 1 and 4 positions, giving it its name. 1,4-Dichlorobenzene is a colorless solid with a distinctive odor reminiscent of mothballs, and it is primarily used as an intermediate in the synthesis of various chemical compounds.

Applications and Importance

1,4-Dichlorobenzene plays a vital role in several industrial applications. It is commonly utilized as a solvent and as a component in the manufacture of pesticides, dyes, and other chemical formulations. Additionally, it has been historically used in the production of mothballs and deodorants and as a fumigant.

Despite its usefulness, the use of 1,4-Dichlorobenzene has raised environmental and health concerns. Studies have indicated that prolonged exposure can pose risks, including respiratory issues and potential carcinogenic effects. As such, regulatory bodies have put forth guidelines to limit its use and manage its impact on human health and the environment.

Regulatory Landscape

In response to the associated risks of chemicals like 1,4-Dichlorobenzene, various regulatory measures have been established. Agencies such as the Environmental Protection Agency (EPA) in the United States and the European Chemicals Agency (ECHA) in Europe have instituted protocols to assess the safety of chemical substances. These regulations are designed to ensure that manufacturers comply with safety guidelines, including reporting on the use and emissions of substances identified by CAS numbers.

Furthermore, the listing of 1,4-Dichlorobenzene on various hazardous substances lists underscores the need for careful handling, usage guidelines, and the pursuit of safer alternatives in industrial processes.

Conclusion

CAS numbers, such as CAS 124-04-9 for 1,4-Dichlorobenzene, are indispensable tools in the world of chemistry, facilitating clear communication about substances across various sectors. While 1,4-Dichlorobenzene serves important industrial functions, the awareness of its potential health and environmental impacts exemplifies the ongoing balance between chemical utility and safety. As the field continues to evolve, the importance of responsible management and innovation in chemical safety practices remains paramount. In a world where chemical substances are integral to numerous applications, understanding and respecting the significance of CAS numbers will undoubtedly play a vital role in promoting health, safety, and environmental stewardship.