BS 5551 SubSec.4.3.3-1984
肥料.第4部分:化学分析.第3节:钾的测定.第3小节:水溶钾含量的测定方法(四苯基硼酸钾重量法:参考法)
Fertilizers. Chemical analysis. Determination of potassium. Method for determination of water-soluble potassium content (potassium tetraphenylborate gravimetric method: reference method)