In this work, aquatic plants Lemina minor were exposed to varying concentrations of cobalt [10, 20, and 30 mg/L] for a month in order to measure the amount of total chlorophyll and its protein content. This was done to evaluate the effects of various salt concentrations on the physiological states of the plants. The investigation's conclusions showed that the amounts of the components in the water plants used for the research rose in a different way than in the control sample as the study came to an end. We examined the levels of protein and chlorophyll in water plants exposed to heavy metals.