The Winkler method is a powerful analytical technique for measuring dissolved oxygen in water. With its ability to detect changes in temperature, it is an important tool for monitoring water quality and investigating the effects of global warming on aquatic ecosystems. This method involves several steps, including the addition of reagents that react with oxygen and the use of spectrophotometry to quantify the results. By understanding the Winkler method and its applications, we can gain valuable insights into the health of our water systems and take steps to protect them for future generations.