Biofilms are the predominant habitat of microbes in aquatic ecosystems. The environment in the biofilm is a nutrient-rich microhabitat that contains many types of ions. These nutrient-rich microhabitats are formed through the adsorption and desorption processes of ions. Hence, ion adsorption and desorption characteristics are essential to understanding and using biofilms for various purposes, such as aquatic environmental purification technology. However, the characteristics of ion desorption from biofilms after adding ions, especially cations, have yet to be widely explored. This study aims to analyze the ion desorption characteristics of the biofilm before and after the addition of monovalent dan divalent cations (i.e., K⁺ and Mg²⁺). The samples were biofilm formed naturally in the Lahor Reservoir in Malang Regency, East Java, Indonesia. The results of this study indicate that the ions will be desorbed from the biofilm matrices when the concentration of these ions around the biofilm decreases. Ions desorbed from biofilm matrices are K⁺, NH₄⁺, Na⁺, Ca²⁺, and Mg²⁺. When the concentration of cations in the surrounding water of the biofilm increases, various ions are desorbed from biofilms while the cation is adsorbed into the biofilm matrices. This study shows that the ions with a greater tendency to be desorbed from the biofilm have the same valence as the added ion. The results of this study indicate that one of the main factors driving ion desorption from the biofilm is the similarity of the characteristics with the ions adsorbed into the biofilm matrix. According to the results of this study, biofilm matrices can play an essential role in shaping ion dynamics in aquatic ecosystems and become one of the critical foundations for understanding aquatic microbial ecology and developing biofilm-based eco-aquatic technology.

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