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seepärast redutseeritakse nitraatlämmastik enne kjeldahli mineraliseerimist metallilise raua ja tina(ii)kloriidi abil ammoniaagiks.
for this reason the nitrate nitrogen is reduced to ammonia with metallic iron and stannous chloride before kjeldahl digestion.
selektiivse katalüütilise taandamise käigus redutseeritakse no ja no2 ammoniaagi ja katalüsaatori abil n2-ks temperatuuril ligikaudu 300–400 °c.
scr reduces no and no2 to n2 with the help of nh3 and a catalyst at a temperature range of about 300 – 400 °c.