Quality control substances such as nitrogen, phosphorus, and potassium in blended fertilizers (BB)

Title: Quality Control Substances for Nitrogen, Phosphorus, Potassium, Effective Calcium, Effective Magnesium, Sulfur, and Chloride Ions in Blended Fertilizer (BB)

英文名称： Quality control substances for nitrogen, phosphorus, potassium, available calcium, available magnesium, sulfur and chloride ions in blended fertilizers (BB)

Product Code: RMK068

Specification: 70g/bottle

Application areas: fertilizers, ecological fields.

Matrix: Blended fertilizer (BB)

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; effective phosphorus (P₂O₅）Minimum sampling amount 0.5g; water-soluble phosphorus (P₂O₅）The specified sampling amount is 1g; potassium content (K)₂O) The minimum sampling amount is 1g; chloride ion (CI)^-）The minimum sampling amount is 2g, and the minimum sampling amount for available calcium (Ca), available magnesium (Mg), and total sulfur (S) is 1g

Applicable standards: GB/T21633-2020、GB/T15063-2020、GB/T15063-2020、GB/T8573-2017、GB/T8574-2024、GB/T15063-2020 Appendix C, GB/T 19203-2003, GB/T24890-2010, GB/T21633-2020

Characteristic Form: Solid (Powder)

Main analysis methods: Total nitrogen (N) is analyzed using the Dumas combustion 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; Water soluble phosphorus (P₂O₅）Adopting pure water extraction inductively coupled plasma optical emission spectroscopy (ICP-OES) and gravimetric method; Potassium content (K)₂O) Using boiling water extraction - potassium tetraphenylborate gravimetric method, inductively coupled plasma optical emission spectroscopy (ICP-OES), flame atomic absorption spectroscopy (FAAS); Chloride ion (CI)^-）Using boiling water extraction electrode potential method and ion chromatography (IC). Effective calcium (Ca) and effective magnesium (Mg) were extracted using citric acid extraction inductively coupled plasma optical emission spectroscopy (ICP-OES); Total sulfur (S) was digested using nitric acid perchloric acid inductively coupled plasma optical emission spectroscopy (ICP-OES) and calcination method.

Value information:

Total nitrogen (N): 15.7 ± 1.3%

Nitrate nitrogen (NO)₃-N)：4.90±0.44%

Ammonium nitrogen (NH)₄⁺-N）：9.98±0.81%

Effective phosphorus (P₂O₅）(EDTA method): 15.3 ± 1.3%

Water soluble phosphorus (P₂O₅）：8.11±0.69%

Potassium content (K)₂O）：15.1±1.3%

Chloride ion (CI)^-）：0.223±0.021%

Effective calcium (Ca): 0.208 ± 0.021%

Effective magnesium (Mg): 2.44 ± 0.22%

Total sulfur (S): 7.70 ± 0.64%