The experimental rusults show that total nitrogen and total phosphorus can be determined at the same time if the right amount of sodium hydrate and potassium persulfate are added.

• 实验结果表明,选用合适的氢氧化钠和过硫酸钾的加入量,可在同一消解液中同时测定总磷和总氮,并能克服消解液保存时间短的缺点。