Quality control substances such as nitrogen, phosphorus, potassium, and available calcium in compound fertilizers

Chinese name: Quality control substances such as nitrogen, phosphorus, potassium, available calcium, available magnesium, sulfur, chloride ions, etc. in compound fertilizers

英文名称： Quality control substances such as nitrogen, phosphorus, potassium, available calcium, available magnesium, sulfur and chloride ions in compound (compound) fertilizers

Product Code: RMK069

Specification: 100g/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; 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 specified sampling amount for effective calcium (Ca) and effective magnesium (Mg) is 2g; the minimum sampling amount for total sulfur (S), total calcium (Ca), and total magnesium (Mg) is 0.2g

Applicable standard: Appendix of GB/T15063-2020 C、GB/T8573-2017 、GB/T8574-2024、GB/T19203-2003、GB/T24890-2010、NY/T1116-2014、NY/T2542-2014、SN/T3097-2012

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; The difference method is used for amide nitrogen [(- CONH ₂) - N]; 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 ions (CI -) were extracted 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), total calcium (Ca), and total magnesium (Mg) were digested using nitric acid perchloric acid inductively coupled plasma optical emission spectroscopy (ICP-OES) and calcination methods.

Value information:

Total nitrogen (N) (excluding organic nitrogen): 14.8 ± 1.3%

Nitrate nitrogen (NO)₃-N)：4.72±0.42%

Ammonium nitrogen (NH)₄⁺-N）：5.95±0.48%

Amide nitrogen [(- CONH ₂) - N]: 4.13 ± 0.39%

Effective phosphorus (P₂O₅）(EDTA method): 11.9 ± 1.0%

Water soluble phosphorus (P₂O₅）：8.60±0.73%

Potassium content (K)₂O）：10.3±0.9%

Chloride ion (CI)^-）：0.476±0.045%

Effective calcium (Ca): 7.88 ± 0.69%

Effective magnesium (Mg): 0.525 ± 0.047%

Total sulfur (S): 3.69 ± 0.31%

Total calcium (Ca): 8.72 ± 0.74%

Total magnesium (Mg): 0.861 ± 0.083%