Total alkali: All Nat compounds Naoh. Na Na2 CO3, Na2SO3 Na,, Na2S2O3, et Active alkali AA: NaoH Nas Effective Alkali EA: NaOH+ Nas Sulfidity: I Na, S/(NaoH+ Na,S)] 100 制浆造纸原理与工程制浆造纸原理与工程 Total alkali: All Na+ compounds NaOH, Na2 S, Na2CO3 , Na2 SO3 , Na2 SO4 , Na2 S2O3 , etc Active Alkali, AA: NaOH + Na2 S Effective Alkali, EA: NaOH + ½ Na2 S Sulfidity:  Na2 S / ( NaOH + Na2 S )  100