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Water salinity is a core factor regulating the structure and function of aquatic ecosystems. Its changes directly affect the survival and reproduction of organisms, community structure, nutrient cycling, and can even trigger regional ecological imbalances. The specific impacts are as follows: I. Direct Impacts on Aquatic Organisms Impact on Cell Osmolarity and Survival Aquatic organisms have specific tolerance ranges for salinity; exceeding these thresholds disrupts cellular osmolarity balance: Freshwater organisms: such as carp and grass carp, have a higher internal osmolarity than the surrounding freshwater and rely on ion regulation systems in their gills and skin to maintain balance. A sudden increase in salinity can lead to cell dehydration and shrinkage, resulting in respiratory distress and death. Marine organisms: such as corals and tuna, have a lower internal osmolarity than seawater and need to excrete excess salt through their salt-excreting organs. A sudden drop in salinit...

(I) Accurate Identification of Ecological Problems and Interruption of Pollution Chains Eutrophication Warning :By monitoring indicators such as chlorophyll, total nitrogen, total phosphorus, and cyanobacteria density, potential algal blooms/red tides can be detected early, allowing for timely implementation of source control, ecological water regulation, and aeration to prevent aquatic organism mortality due to oxygen depletion, food chain disruption, and aquatic ecosystem collapse. Tracking Heavy Metal/Toxic Organic Pollution:Monitoring pollutants such as lead, mercury, arsenic, pesticide residues, and petroleum hydrocarbons in water bodies identifies pollution sources. Enforcement and supervision drive emission reductions, minimizing pollutant accumulation in aquatic organisms and their transmission through the food chain. Protecting Groundwater and Wetland Ecosystems:Regular monitoring of groundwater over-extraction areas and wetland recharge areas tracks water quality and quantity...

BOD is the biochemical oxygen demand (Biochemical Oxygen Demand), also known as biochemical oxygen consumption, which is a comprehensive indicator of the content of oxygen-demanding pollutants in water and is widely used in environmental engineering and other fields. The following is a detailed introduction for you: Definition Biochemical oxygen demand refers to the amount of dissolved oxygen consumed in the biochemical reaction of microorganisms decomposing biodegradable organic matter in water under certain conditions, expressed in mg/L or percentage, ppm. Significance It is a comprehensive indicator reflecting the content of organic pollutants in water. The higher the BOD value, the more organic pollutants there are in the water body and the worse the water quality. It also reflects the degradation rate of organic matter in the water body and the self-purification capacity of the water body. Differences from other indicators Different from COD (Chemical Oxygen Demand), COD uses che...

In water quality monitoring , COD (chemical oxygen demand) and BOD (biochemical oxygen demand) are two very important indicators, which are mainly used to evaluate the degree of organic pollution in water bodies. COD (chemical oxygen demand) Definition: COD is the amount of oxidant consumed when a certain strong oxidant is used to treat a water sample under certain conditions. It reflects the degree of pollution of reducing substances in the water. The greater the chemical oxygen demand, the more serious the organic pollution in the water. COD is expressed in mg/L. Application: The determination of COD is not limited by water quality conditions and the determination time is short. COD can not only reflect the organic pollution in the water, but also indicate the inorganic substances with reducing properties in the water, such as sulfide, ferrous ions, sodium sulfite, etc.2. COD is often used to quickly evaluate the degree of pollution of water bodies, especially in the sewage treatment...