Nleba anya na ịchịkwa ihe nitrogen: mkpa nitrogen zuru ezu, amonia nitrogen, nitrate nitrogen, nitrite nitrogen, na Kaifel nitrogen.

Nitrogen bụ ihe dị mkpa. Ọ nwere ike ịdị n'ụdị dị iche iche na ahụ mmiri na ala na okike. Taa, anyị ga-ekwu maka echiche nke mkpokọta nitrogen, amonia nitrogen, nitrate nitrate, nitrite nitrogen, na Kaishi nitrogen. Ngụkọta nitrogen (TN) bụ ihe nrịbama nke a na-ejikarị atụta mkpokọta nitrogen n'ime ahụ mmiri. Ọ na-agụnye amonia nitrogen, nitrate nitrate, nitrite nitrogen, na ihe ndị ọzọ dị na nitrogen, dị ka mgbọrọgwụ nitrate na nitrate. Amonia (NH3-N) na-ezo aka na mkpokọta amonia (NH3) na amonia oxides (NH4+). Ọ bụ alkaline nitrogen na-adịghị ike ma nwee ike meghachi omume site na mmeghachi omume nke ndu na kemịkalụ na ahụ mmiri. Nitral nitrogen (NO3 -N) na-ezo aka na ntinye nke mgbọrọgwụ nitrate (NO3-). Ọ bụ nitrogen acid siri ike, nke bụ isi ụdị nitrogen. Ọ nwere ike ịbụ site na ọrụ ndu nke amonia nitrogen na nitrogen organic na ahụ mmiri. Nitric nitrogen (NO2 -N) na-ezo aka na ntinye nke mgbọrọgwụ nitrite (NO2 -). Ọ bụ nitrogen acid na-adịghị ike, ihe na-ebute nitrate nitrate, ọ pụkwara isite na mmeghachi omume nke ndu na kemịkal dị n'ime ahụ mmiri. Kjeldahl-N na-ezo aka na nchikota amonia oxides (NH4+) na organic nitrogen (NORG). Ọ bụ ụdị nitrogen amonia nke nwere ike isi na mmeghachi omume nke ndu na kemịkal dị n'ime ahụ mmiri.
Nitrogen dị n'ime mmiri bụ akụkụ dị mkpa, nke nwere ike imetụta àgwà mmiri, ọnọdụ gburugburu ebe obibi nke mmiri mmiri, na uto na mmepe nke usoro ihe ọmụmụ mmiri. Ya mere, nlekota na njikwa nke mkpokọta nitrogen, amonia nitrogen, nitrate nitrate, nitrite nitrogen, na Kaishi nitrogen n'ime ahụ mmiri dị ezigbo mkpa. Ọdịnaya nke mkpokọta nitrogen bụ ihe ngosipụta dị mkpa maka ịlele mkpokọta nitrogen n'ime ahụ mmiri. N'ozuzu, mkpokọta nitrogen dị n'ime ahụ mmiri kwesịrị ịdị n'ime oke. Oke ma ọ bụ dị ala ga-emetụta ogo mmiri nke ahụ mmiri. Na mgbakwunye, amonia nitrogen, nitrate nitrogen, nitrite nitrogen, na Kaifer nitrogen bụkwa ihe ndị dị mkpa iji chọpụta ihe nitrogen dị n'ime ahụ mmiri. Ọdịnaya ha kwesịkwara imetụta ịdịmma mmiri nke ahụ mmiri n'ime oke ụfọdụ.
Ka ọ dị ugbu a, ọtụtụ mba nwere ụkpụrụ siri ike maka ọdịnaya nke mkpokọta nitrogen, amonia, nitrate nitrogen, nitrite nitrogen na Kaifer nitrogen n'ime mmiri. Mmetụta siri ike. Ya mere, onye ọ bụla kwesịrị ịṅa ntị na nlekota na ịchịkwa ihe ndị dị na nitrogen n'ime mmiri iji hụ na mmiri dị mma nke mmiri na-agbaso ụkpụrụ nke steeti. Na mkpokọta, mkpokọta nitrogen, amonia nitrogen, nitrate nitrate, nitrite nitrogen, na Kaifel nitrogen bụ ihe dị mkpa na-egosi ihe nitrogen dị n'ime ahụ mmiri. Ọdịnaya ha bụ ihe ngosi dị mkpa maka ịlele ogo mmiri, nke dị oke mkpa maka nlekota na njikwa. Naanị site na nleba anya na njikwa ezi uche nke ihe nitrogen dị n'ime mmiri, anyị nwere ike hụ na mmiri dị mma nke mmiri na-agbaso ụkpụrụ ma na-echebe ahụike nke mmiri mmiri.
Akara Lianhua ewepụtala ngwa ịchọpụta ogo mmiri ruo afọ 40. Ọ nwere ike ịnye ngwaahịa achọpụtara na amonia nitrogen, nitrogen mkpokọta, nitrogen nitrate, na nitrate nitrogen.