Analysis of distribution dissolved oxygen concentration in Kali Lamong river estuary, Surabaya during pandemic Covid-19

Dissolved oxygen (DO) is the amount of gaseous oxygen dissolved in water, which is influenced by atmospheric pressure, temperature, salinity, water turbulence, photosynthesis, respiration, and waste. The amount of dissolved oxygen DO in a river or lake represents the quality of water. Water molecules contain an oxygen atom. However, it is not needed by aquatic organisms living in natural water. This study aims to analyze the distribution of dissolved oxygen DO concentration distribution in the Kali Lamong river estuary during pandemic Covid-19 in.the dry season. The concentration of dissolved oxygen DO was measured by DO meter in real-time. The result demonstrated that the average concentration of dissolved oxygen dissolved oxygen concentration in the Kali Lamong river estuary was 5.29 mg/L. The results show that the water quality of Kali Lamong is classified in second class. These criteria indicate the water classification that can be utilized for water infrastructure/facilities.