简介：During1985～1987,theconcentrationofnitratenitrogenwashigherintheLaizhouBayandtheBohaiBaywhilethatofnitritenitrogenwashigherintheLiaodongBayandtheBohaiBay,Theconcentrationofnitratenitrogenwashighestinwinterandlowestinsummerwhilethatofnitritenitrogenwashighestinautumnandlowestinspring.theseasonalvariationoftheconcentrationofnitratenitrogenwasmaximumintheLaizhouBayandtheBohaiBaywhilethatoftheconcentrationofnitritenitrogenwasmaximumintheLiaodongBay.Therewasagreatdifferenceintheconcentrationofnitratenitrogenbetweenthesurfaceandthebottominautumnandintheconcentrationofnitritenitrogenbetweenthesurfaceandthebottominsummer.Themainreasonfortheseasonalvariationsoftheconcentrationofnitratenitrogenandnitritenitrogenwasthemarinebiochemicalprocess.ThenitratenitrogenandnitritenitrogenintheBohaiSeabasicallymaintainedaquasi-equilibriumstateseasonalcycle,Thequesi-equilibriumstateseasonalcycleofnitratenitrogenandnitritenitrogenatthebottomwasstablewhilethatatthesurfacewasliabletovariationscausedbyotherfactors.

简介：NH^+4-N对吴郭鱼的24小时半致死浓度为41．39ppm，当水中NO^2--N浓度维持在6．4ppm时，对吴郭鱼24小时半致死浓度为44．58ppm。48小时半致死浓度为41．55ppm.当PH9．6时，对鲤鱼的24小时半致死浓度为6．02ppm，当PH为8．9时为8．57ppm，当PH8．2时为18．45ppm，PH8．0时为22．31ppm，PH7．S时为48．18ppm，PH7．0时则超过100ppm。