The book "Marine Chemistry" offers a comprehensive introduction to the fundamental principles of reaction equilibria and kinetics that play a role in marine geochemical cycles. It highlights how the main electrolytes influence the rates and equilibria of chemical reactions in the ocean. To understand these interactions, a detailed knowledge of major, minor, and trace elements is necessary. Furthermore, this work focuses on the development and application of analytical techniques for the accurate determination and specification in seawater. Another important aspect is the investigation of the effects of pollution on the marine ecosystem, as even small amounts of other elements can significantly impact the global chemical cycle. The book is aimed at professionals such as marine chemists, biogeochemists, ecologists, oceanographers, environmental engineers, and analytical chemists.