1 Scope
This standard specifies test methods for determination of total nitrogen, phosphorus and potassium content in water-soluble fertilizers.
This standard is applicable to determination of total nitrogen, phosphorus and potassium content in liquid or solid water-soluble fertilizers.
2 Normative References
The following documents are indispensable for the application of this document. For dated references, only the dated edition is applicable to this document. For undated references, the latest edition (including all the amendments) applies.
GB/T 8170 Rules of Rounding off for Numerical Values & Expression and Judgment of Limiting Values
GB/T 8572 Determination of Total Nitrogen Content for Compound Fertilizers Titrimetric Method after Distillation
HG/T 2843 Chemical Fertilizer Products Standard Volumetric, Standard, Reagent and Indicator Solutions for Chemical Analysis
NY/T 887 Density Testing of Liquid Fertilizer
3 Determination of Total Nitrogen Content
Foreword I
1 Scope
2 Normative References
3 Determination of Total Nitrogen Content
4 Determination of Phosphorus Content - Quinoline Phosphomolybdate Gravimetric Method
5 Determination of Potassium Content - Potassium Tetraphenylborate gravimetric Method
