98.5% Purity NaNO2 Sodium Nitrite for Azo Dyes and Metal Heat Treatment
Sodium nitrite, commonly known as nitrate, is an inorganic compound with the chemical formula NaNO2. It is a white to light yellow powder or granular substance, resembling table salt, monosodium glutamate and white granulated sugar in appearance. It is odorless, hygroscopic, toxic, highly soluble in water, slightly soluble in methanol . Its aqueous solution is alkaline, with a pH value of approximately 9. Sodium nitrite is a strong oxidizing agent with reducing properties. It gradually oxidizes in the air, and its surface turns into sodium nitrate. It can also be oxidized by oxidizing agents. It decomposes upon encountering weak acids and releases brown nitrogen dioxide gas. Contact with organic substances and reducing agents can cause explosion or combustion and release toxic and irritating nitrogen oxide gas. It can also be oxidized by strong oxidants, especially ammonium salts. For instance, at room temperature, they can interact with ammonium nitrate, ammonium persulfate, etc., generating high heat and causing combustibles to catch fire. It is mainly used for manufacturing azo dyes and can also be used as a mordant, bleaching agent and metal heat treatment agent for fabric dyeing.
| ITEM | Value | |||
| Best quality | First quality | Qualified quality | result | |
Content of sodium nitrite (calculated by dry base) % | ≥99.0 | ≥98.5 | ≥98.0 | 98.5 |
Content of sodium nitrate (calculated by dry base) % | ≤0.8 | ≤1.0 | ≤1.5 | 1.2 |
Content of chloride(NaCl) (calculated by dry base) % | ≤0.10 | ≤0.17 | — | 0.11 |
| Content of insolubles in water(calculated by dry base) % | ≤0.05 | ≤0.06 | ≤.10 | 0.009 |
| Moisture % | ≤1.4 | ≤2.0 | ≤2.5 | 1.2 |
| Appearance of the product | White fine crystal | |||
| Package and Trademark | By a woven plastic bag out, and a white plastic bag inner | |||
| Result | First quality | |||
Food Industry
Nitrite is mainly used as a preservative and color fixative in food processing, but its dosage must be strictly controlled to avoid excessive intake that may harm health.
1. Preservation and color protection of meat products
2. Application in pickles
Industrial Field
1.Corrosion inhibitor
In the fields of metal processing and anti-corrosion, nitrite can be used as a water-soluble corrosion inhibitor and added to cutting fluids, antifreeze, boiler water, etc., to inhibit the corrosion of metal surfaces (such as rusting of steel).
2. Organic synthesis raw materials
NaNO2 is used for the synthesis of organic compounds such as dyes, drugs and pesticides.
3. Concrete additives
Sodium nitrite is used in concrete as an antifreeze or early strength agent to lower the freezing point, promote the hardening of cement, and improve the construction performance of concrete in low-temperature environments.
Applications in the Fields of Medicine and Biology
1. Antidote (Cyanide poisoning)
Nitrite can oxidize hemoglobin to methemoglobin. Methemoglobin can combine with cyanide ions (CN⁻) to form non-toxic cyanated methemoglobin, thereby eliminating the acute toxicity of cyanide (it needs to be used in combination with sodium thiosulfate).
2. Biological experimental reagents
In biochemical experiments, nitrite can be used as a reagent to detect the activity of proteins, amino acids or enzymes (such as diazotization reactions for detecting aromatic amino acids).