Quality control substances for total nutrients nitrogen, phosphorus, and potassium in compound fertilizers

Chinese names: Quality Control Substances for Total Nutrients (Nitrogen, Phosphorus, Potassium) in Compound Fertilizers (GB/T15063-2020), (GB/T8573-2017), (GB/T8574-2024), (NY/T2540-2014), (NY/T1116-2014)

英文名称： Quality control substance of total nutrient (N, P, K) in compound fertilizer

Product Code: RMK067

Specification: 70g/bottle

Application areas: fertilizers, ecological fields.

Matrix: Compound fertilizer

Storage conditions: Store at room temperature and away from light

Attention: During opening and use, precautions should be taken to prevent contamination. The minimum sampling amount for total nitrogen (N) is 0.05g; nitrate nitrogen (NO)₃-N) The minimum sampling amount is 0.5g, ammonium nitrogen (NH)₄⁺-N) The minimum sampling amount is 0.1g, and the effective phosphorus (P₂O₅）Minimum sampling size 2g; potassium content (K)₂O) The minimum sampling amount is 0.5g

Applicable standards: GB/T15063-2020, GB/T8573-2017, GB/T8574-2024, NY/T2540-2014, NY/T1116-2014

Characteristic Form: Solid (Powder)

Main analysis methods: Total nitrogen (N) was determined using Dumas combustion method and sulfuric acid digestion distillation titration method; Nitrate nitrogen (NO)₃-N) Using ultraviolet spectrophotometry (UV) and ion chromatography (IC); Ammonium nitrogen (NH)₄⁺-N) Adopting the alkalization distillation titration method; Effective phosphorus (P₂O₅）Adopting EDTA extraction inductively coupled plasma optical emission spectroscopy (ICP-OES) and gravimetric method; Potassium content (K)₂O) Potassium tetraphenylborate gravimetric method, inductively coupled plasma optical emission spectroscopy (ICP-OES), and flame atomic absorption spectroscopy (FAAS) were used.

Value information:

Total nitrogen (N): 15.0 ± 1.2%

Nitrate nitrogen (NO)₃-N)： 7.08±0.61%

Ammonium nitrogen (NH)₄⁺-N）：7.84±0.63%

Effective phosphorus (P₂O₅）(EDTA method): 6.15 ± 0.54%

Potassium content (K)₂O）：23.7±1.9%