An improvement of the determination of phosphate was made on the basis of the State Standard Method through decrease the volume of sulfuric acid while preparing the ammonium molybdic solution.

• 本文对国标法测定磷酸盐方法进行了改进,通过减少配制钼酸铵溶液时硫酸的用量使得方法的准确度、灵敏度都得到提高,应用于工业循环冷却水中磷酸盐的测定,结果满意。