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| "Synonyms:Tetrasodium hexacyanoferrate Sodium hexacyanoferrate(II) Sodium prussiate yellow Sodium ferrocyanide decahydrate Molecular Formula:Na4[Fe(CN)6]·10H2O Molecular Weight: 484.06 HS Code: 2837200000 Grade: Industrial grade；Food Grade99%+ Hazard Class:General Cargo" | |||||||||
13601-19-9
bosschemical
13601-19-9
Sodium ferrocyanide (also known as yellow prussiate of soda, or YPS) is a sodium hexacyanoferrate (II) complex formed by iron and cyanide ions. It is a classic iron salt studied in analytical chemistry and coordination chemistry. Its chemical formula is usually written as:
Na4Fe(CN)6 (decahydrate Na4Fe(CN)6·10H2O, CAS No.: 13601-19-9 (anhydrous), 14434-22-1 (decahydrate), EINECS No.: 237-081-9, molecular weight approx. 303.91 (anhydrous), 484.06 (decahydrate))
At room temperature, it is a lemon-yellow translucent crystal or crystalline powder, odorless, soluble in water (the decahydrate has higher solubility), slightly soluble in ethanol, and loses its water of crystallization at about 100℃, turning into a white powder. Reagent-grade and research-grade products must be refined from high-purity raw materials and subject to stricter purity and impurity standards.
From a molecular structure perspective, the anion of sodium ferrocyanide is [Fe(CN)6]4-, with six cyanide ions (-CN) coordinated around the ferrous ion at their carbon ends to form a stable octahedral complex. This typical transition metal cyanide complex structure makes it a classic subject of coordination chemistry. Simultaneously, its reaction with ferric ions to form Prussian blue—a characteristic reaction that is not only a classic method for testing for ferric ions in analytical chemistry but also a fundamental reaction for synthesizing Prussian blue-like compounds (PBA) functional materials, which is currently a research hotspot in sodium-ion battery electrode materials.
Chemically, sodium ferrocyanide reacts with ferric ions to form Prussian blue, and decomposes to produce hydrocyanic acid when exposed to strong acids or high temperatures. It is low in toxicity and stable, but must not be stored with acids. Reagent-grade products must be stored in sealed, moisture-proof, and light-protected conditions.
Non-food grade and non-industrial grade sodium ferrocyanide refer to products intended for testing and scientific research applications, rather than food processing or large-scale industrial use. These primarily include reagent-grade and research-grade specifications. Compared to food-grade and industrial-grade products, these products place greater emphasis on the following indicators:
Content (purity)
Reagent-grade reagents require high purity (generally above 99%), as purity directly determines the accuracy of analytical results and experiments.
Free cyanide
Free cyanide is a critical safety indicator for the product and must be strictly controlled (the lower the better) to ensure experimental safety.
Heavy metal limits
Reagent-grade reagents have strict limits on heavy metal content to ensure experimental safety and analytical reliability.
Water-insoluble matter
The solution must be extremely low in water-insoluble matter to ensure clarity and transparency, and to avoid impurities interfering with analysis and reaction.
Clarity
The aqueous solution should be clear, free of turbidity and insoluble matter, reflecting the purity of the product and the level of process control.
1. Anti-caking agent for edible salt (core application)
Sodium ferrocyanide, according to GB 2760, is a special anti-caking agent for edible salt. The maximum usage based on ferrocyanide is 0.01 g/kg. It can inhibit salt from absorbing moisture and clumping, and maintain the good looseness and flowability of salt particles. It is a mature and classic anti-caking aid in the salt making industry.
( 1 ) It can be applied to ordinary table salt, table salt, seasoning salt, low sodium salt and potassium-type healthy salt, ensuring that the product is loose and easy to sprinkle, and that the weighing and measurement are stable, making it suitable for daily seasoning in the home and for use in the catering industry.
( 2 ) Its corresponding food additive code E535 is an internationally recognized standard. It is widely used in sea salt and table salt in the European and American markets, and is also a commonly used anti-caking agent for imported salt entering the domestic market.
( 3 ) China’s exported salt uses sodium ferrocyanide anti-caking agents in accordance with international standards (the US limit is 20 mg/kg based on anhydrous matter, and the Australian and New Zealand standard is 50 mg/kg for the total amount of potassium ferrocyanide/sodium), serving the global salt market.
2. Salt for food processing and pickling
Sodium ferrocyanide is used as an anti-caking treatment for salt in food processing and pickling, keeping it fluid and enabling accurate measurement in pickling, seasoning and food production. It is an important additive to salt in the food industry.
3. Prussian Blue (Iron Blue) Pigment Production (Core Application)
Sodium ferrocyanide reacts with ferric salts to produce Prussian blue (ferric ferrocyanide), a classic blue inorganic pigment with high weather resistance, high tinting strength, and strong hiding power. It is widely used in paints, industrial coatings, inks, plastics, rubber, and educational pigments, and is the most mainstream variety of blue inorganic pigment.
4. Steel carburizing and metal surface treatment
Sodium ferrocyanide is used in liquid carburizing heat treatment of carbon steel to help improve the surface hardness and wear resistance of steel parts; it is also used for anti-corrosion treatment of metal surfaces, serving the hardware, machinery and cutting tool industries.
5. Analytical Chemical Reagents
Sodium ferrocyanide is a classic raw material for studying transition metal cyanide complexes, coordination chemistry, and the synthesis of Prussian blue (PBA) compounds. It is used in the study of complex structures, reaction mechanisms, and functional materials, serving both academic research and technological development.
6. Red blood salt and fine chemical raw materials
Sodium ferrocyanide is a basic raw material for the preparation of fine chemicals such as sodium ferricyanide (sodium prussiate of potassium ferrocyanide), and is also used in the production of cyanide derivatives. It is an important intermediate in the cyanide complex chemical industry.
7. Metal purification and separation
Sodium ferrocyanide is used in the purification of tin and in the separation of metals such as copper from molybdenum ore. It utilizes its complexing and precipitation properties to achieve the separation and purification of metals, serving the metallurgical industry.
8. Research on New Energy Battery Materials
Sodium ferrocyanide is an important raw material for the synthesis of Prussian blue analogues (PBA). PBA, as a cathode material for sodium-ion batteries, has the advantages of low cost and good rate performance, and is a research hotspot in the field of energy storage. It may be used for small-batch synthesis research in the laboratory.
9. Customized Synthesis and Functional Materials Development
Sodium ferrocyanide can be used to synthesize Prussian blue nanomaterials, molecular magnets, and electrochromic materials, serving the research and development of functional and new materials. It is a small-batch raw material in the research and development stage.
It should be noted that non-food grade and non-industrial grade specifications do not mean "risk-free": Sodium ferrocyanide will decompose and release hydrocyanic acid when exposed to strong acids or high temperatures. Reagent-grade products are for experimental use only and are strictly prohibited from being ingested. Experimental operations must be carried out in a ventilated place with protective equipment worn, away from acidic substances, and stored in a sealed, moisture-proof, and light-proof container.
Sodium ferrocyanide (Na4Fe(CN)6, CAS No. 13601-19-9, decahydrate 14434-22-1) is a lemon-yellow crystal. The cyanide ion is stably locked within the [Fe(CN)6]4- ion. It exhibits extremely low toxicity at room temperature and is a classic research subject in coordination chemistry. In daily life, we indirectly encounter it through testing and analysis services, scientific research and university laboratories, new energy battery research, teaching experiments, and the industrial chain. In non-food and non-industrial applications, reagent-grade and research-grade sodium ferrocyanide with a purity of over 99% is widely used in iron ion analysis and detection, coordination chemistry research, Prussian blue sodium battery material development, teaching experiments, and custom synthesis. It is a crucial reagent connecting "cyanide complex chemistry" with "detection, scientific research, and new energy."
