离子选择性电极测定球形氢氧化镍中的硝酸根

Determination of nitrate in spherical nickel hydroxide by ion-selective electrode

合适浓度的氢氧化钠溶液浸取,使试样中的硝酸根与基体镍分离,以磷酸二氢钠为离子强度调节剂,离子选择性电极测定球状氢氧化镍中的硝酸根,浸出液中微量元素对测定无干扰。本法测定回收率96.5%～102.0%,标准偏差不大于0.0005%,相对标准偏差不大于7.27%。

Nitrate in spherical nickel hydroxide was determined by ion-selective electrode with sodium dihydrogen phosphate as the ionic strength adjustor, and trace elements in the leaching solution did not interfere with the determination. The results showed that the recovery rate was 96.5%--102.0%, the standard deviation was less than 0. 0005%, and the relative standard devi- ation was less than 7.27%.