Problems of baseline value,alkali liquor suckback,sodium hydroxide solution reutilization in process of determination of nitrogen in the coal using semi-micro gasification method are introduced,the feasibility of judging termination using automatic titrimetry instead of artificial visual titrimetry is discussed.

Effective calcium oxide in lime can be combined with sucrose to create higher-solubility calcium sucrose while calcium carbonate in lime and other calcium salts don t act with sucrose,by which to separate it,then the EGTA titrimetric method was used to determine effective calcium oxide content.