what chemicals are used in eutrophication
Trophic state. The level of eutrophication of a water body is expressed as a trophic state. The trophic state of a water body is derived from multiple parameters. Besides nutrient concentrations such as phosphorus and nitrogen, other parameters such as chlorophyll-a and secchi-depth are also used.rophic state. The level of eutrophication of a water body is expressed as a trophic state. The trophic state of a water body is derived from multiple parameters. Besides nutrient concentrations such as phosphorus and nitrogen, other parameters such as chlorophyll-a and secchi-depth are also used.