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Sodium nitrate

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Sodium nitrate Chemical Properties
mp 306 °C (dec.)(lit.)
bp 380 °C
density 1.1 g/mL at 25 °C
storage temp. Store at RT.
solubility H2O: 1 M at 20 °C, clear, colorless
Water Solubility 900 g/L (20 ºC)
Sensitive Hygroscopic
Merck 14,8647
Stability:Stable. Strong oxidizer - may ignite flammable material. Incompatible with cyanides, combustible material, strong reducing agents, aluminium.
CAS DataBase Reference7631-99-4(CAS DataBase Reference)
EPA Substance Registry SystemNitric acid sodium salt(7631-99-4)
Safety Information
Hazard Codes O,Xn,Xi,C
Risk Statements 8-22-36/37/38-36/38-34-36
Safety Statements 17-26-27-36/37/39-37/39-36-45
RIDADR UN 1498 5.1/PG 3
WGK Germany 1
RTECS WC5600000
3
HazardClass 5.1
PackingGroup III
HS Code 31025090
Hazardous Substances Data7631-99-4(Hazardous Substances Data)
MSDS Information
ProviderLanguage
Sodium nitrate English
SigmaAldrich English
ACROS English
ALFA English
Sodium nitrate Usage And Synthesis
Water SolubilityThe dissolved grams per 100 ml of water at different temperature (oC): 73g/0oC; 80.8g/10oC; 87.6g/20oC; 94.9g/30oC; 102g/40oC; 122g/60oC; 148g/80oC; 180g/100oC .
Identification TestNitrate test (IT - 23) and sodium salt test (IT - 28) are positive.
Content AnalysisGB 1891-86 method
Principle:
Boiling nitrate and nitrogen alloy (45A150; u5Zn) in strong alkaline solution results in releasing of hydrogen, which reduces nitrogen nitrate (or other nitrogen compounds) to ammonia. Absorption ammonia with excess sulfuric acid then titration with standard alkali solution.
Reagent and Solution :
Preparation of mixed indicating liquid: Dissolve 0.12 g of methyl red and 0.12 g of methylene blue in 100 ml 95% ethanol solution.
Nitrogen alloy is smashed to pass through a screen of 20 meshes, and the content of alloy can pass through a screen of 80 meshes should not exceed 20%.
Dissolve 14 g (Accurate to 0.0002 g) of fully blended sample in water with a beaker, then transfer into 500 ml volumetric flask, dilute to scale and shake to be a backup.
Use the distillation unit as shown. Draw 50 ml of 0.5 mol/L sulfuric acid solution using straw into 500 ml conical flask, then add 50 ml of water.
Draw 50 ml of prepared liquid sample through a straw into a 1000 ml flat-bottomed distillation flask, then add 7.5 g nitrogen alloy, and 150 ml of water along the wall of bottle. Join the distillation unit according to the figure, and make the tube 4 hit the end of the bottom of the bottle. Add 70 ml of sodium hydroxide solution (300 g/L solution) in distillation bottle 1 quickly, immediately insert rubber stopper, reaction after 20 min at room temperature, micro heat 10 min, then high temperature distillation. After boiling 50 ~ 60 min, and obtain about 270 ml of solution in bottle (residual liquid product is about a third of the initial volume), down the conical flask, leave the tip of the tube 4 out of the liquid level inside the conical flask solution, then wash pipe 4 with water, stop heating.
Blank experiment was carried out at the same time under the same conditions in addition to the water replacement of liquid sample.
In the formula, c - concentration of standard sodium hydroxide solution (0.5 mol/L)
Vo - Blank consumption volume of NaOH standard solution, ml;
V - Sample consumption volume of NaOH standard solution, ml;
m - The quality of sample, g;
z - water content measured by the standard, %;
z, - Sodium nitrite content measured by the standard, %;
0.08499 - Millimoles quality of sodium nitrite, g;
1.232 - The coefficient of sodium nitrite to sodium nitrate.
The difference between the two parallel determination results should not be greater than 0.3%. Take the arithmetic mean as the determination results of parallel determination results. The difference between the different laboratory determination results is not greater than 0.5%.
Notice: Before testing the sample, verification using replacement of potassium nitrate with the same method. Calculation method is as follows.
In the formula, G - The quality of the benchmark potassium nitrate, g;
0.10111 - millimoles quality of potassium nitrate, g.
If several analysis results of potassium nitrate were between 99.95% ~ 100.05%, the test equipment is regarded in good condition (at least to be between 99.80% ~ 100.10%).
FAO/WHO method
Accurately weight 0.4 g of sample which has been dried at 105oC for 4 h into a 500 ral round bottom flask, then add 300 ml water. Add 3 g of Devardas alloy powder and 15 ml of 40% sodium hydroxide solution, join the splash ball and condenser on the flask. Stewing for 2h. Use a bottle containing50 ml of 0.1 mol/L sulfate acid to collect 250 ml of distillate, add three drops of methyl red - methylene blue test solution (TS - 150), use 0 ~ mol/L sodium hydroxide titration excess sulfuric acid. Blank experiment was carried out at the same time. Every mL0.1 mol/L equivalent to 8.5 mg sulfate sodium nitrate (NaNO3).
ToxicityADI 0 ~ 3.7 mg/kg (NO3 - meter, but do not apply to the baby younger than 3 months FAO/WHO, 2001). LD50 1100~2000mg/kg (rats, through the mouth).
Accordance to the stipulations of GB 2760-86, it can be used in hair color agent and in meat products, the maximum amount is 0.5 g/kg; residues be calculated by sodium nitrite, meat canned must not exceed 0.05 g/kg, meat products shall not be more than 0.03 g/kg.
Infants younger than six months are particularly sensitive to nitrate, do not be used for baby food. HACSG (EC child protection group) suggestions restriction for infants and young children food.
Dust can irritate the lungs and skin. Sodium nitrate has the characteristic of reduction to sodium nitrite in body, often resulting in formation of denaturation of hemoglobin, drinking water containing 50~100 RNG/L sodium nitrate, denaturation of hemoglobin in the blood rise significantly. Workers operate the production must wear work clothes, protective masks, latex gloves and other labor insurance supplies, in case of dust suction and protect respiratory and skin. Production equipment should be closed and the workshop ventilation is good. Take a shower after work.
Utilization LimitationGB 2760-1996: same as "17301," potassium nitrate.
The FAO/WHO (1984 mg/kg): cooked the ham, meat cooked pork shoulder, maximum amount 500; General cheese 50.
FDA, § 172.170 (2000 mg/kg): sodium nitrate total 500, 200 total sodium nitrite.
Chemical PropertiesColorless tripartite crystal or diamond crystals or white tiny crystal or powder. Odourless, taste salty, slightly bitter. Soluble in water and liquid ammonia, soluble in ethanol, methanol, slightly soluble in glycerol and acetone.
UsesSodium nitrate is one of the earliest nitrogen fertilizer, can be used for acid soil, especially suitable for root crops, such as sugar beet and radish. In the end of the 19th century to the early 20th century, Chile exploited sodium nitrate mining in large scale as nitrogen fertilizer for the world. Farmers in Xinjiang uygur autonomous region in China digged desert surface soil contain NaNO3 to plant grape fruits, and the fertilizer effect is remarkable.
Sodium nitrate can be used to make nitrate, picric acid, explosives, mineral raw materials, dyes, osmotic pressure regulator in medicine and other nitrogen compounds, it also can be used in glass, metallurgy, light industry and other industrial sectors.
In glass industry, it can be used for the production of various kinds of glass and its products of defoaming agent, decoloring agent, clarifying agent and oxidation solubilizer. Enamel industry uses it as oxidant, solubilizer, and to make enamel powder. Machinery industry uses it as metal cleaner, dispensing black metallic blue agent. Metallurgical industry uses it for steel and aluminum alloy heat treatment. Light industry uses it as combustion improver of cigarettes. Pharmaceutical industry uses it as a medium of penicillin.
It can be reduction by bacteria into sodium nitrite in meat, which results in color protection and bacteriostatic effect, and can be used as food color fixative in China.
It also can be used as decolorizing agent of molten caustic soda and analytical reagent.
Production MethodAbsorption method:
Bubble the exhaust derived from nitric acid production (contain NO + NO2 0.5% ~ 1.5%) into the bottom of absorption tower, use soda solution with a relative density of 1.240 ~ 1.3 and temperature of 25 ~ 60 oC spraying from the top of the tower to absorption nitrous oxide in gas, and then obtain the neutralizer. Add neutralizing liquid and nitric acid into converter, sodium nitrite will transform into sodium nitrate, the conversion temperature is between 90 ~ 105 oC, stirring with air at the same time. Using soda solution to neutralize the free acid in converted solution, keeping the alkalinity below 0.3 g/L, in atmospheric evaporation to solution the boiling point of 123 ~ 123 oC, through cooling crystallization, centrifugal separation, drying, sodium nitrate is obtained.
Na2CO3+NO+NO2→2NaNO2+CO2↑
Na2CO3+2NO2→NaNO2+NaNO3+CO2↑
3NaNO2+2HNO3→3NaNO3+H2O+2NO↑
Nitrogen gas released from oxidation reaction process can be returned to nitric acid production system to make nitric acid.
Double decomposition method:
Mix 50% ~ 52% of calcium nitrate, sodium sulfate and calcium nitrate solution cycle solution into a stirring reactor, reaction was conducted in the 50 ~ 55 oC under stirring for 3 ~ 4 h, filter the plaster through vacuum filter, and further filter to remove impurities, remove plaster after been washed with water, wash water merged with the filtrate, part of them return to diluted slurry reactor, and part of them been evaporation and concentration, through cooling crystallization, centrifugal separation and drying, sodium nitrate is obtained.
Ca(NO3)2+Na2SO4→2NaNO3+CaSO4↓
Direct extraction method:
The sodium nitrate ore is broken to a certain size, use fresh water or brine to spray heap leaching, then get a certain concentration of sodium nitrate brine, cooling to separate mirabilite, send brine to evaporation pans tan, until sodium nitrate alum (Na2SO4, NaNO3·H2O) crystal appeared, after filtering, the by-produc of sodium chloride brine continue insolation evaporation to get semi-finished products contained sodium nitrate alum. Melt the semi-finished product with a certain amount of brine (or crystallization mother liquor), after been filtered to remove impurities, filtrated the cooling crystallization, centrifugal separation, drying, sodium nitrate is obtained.
Conversion method:
Sodium nitrite concentration and dilute nitric acid mother liquor are sent into the tower, through steam heating and ventilation with compressed air mixing, then transform into sodium nitrate solution, add soda solution until slightly alkaline solution, then through purification, filtration, removal of arsenic and heavy metals, evaporation and concentration, cooling crystallization, centrifugal separation, drying, the food grade sodium nitrate is obtained.
3NaNO2+2HNO3→3NaNO3+H2O+2NO↑
CategoryOxidizing agent
Toxicity GradingPoison.
Acute ToxicityOral - LD50 in rats: 1267 mg/kg. Static chamber - LD50 in mice: 175 mg/kg.
Explosive Dangerous FeaturesExplosive mixed with sulfur, phosphorus, charcoal and other flammable.
Flammability Hazard CharacteristicsDecompose to generate oxygen when been heated; flammable when encounter organic matter, reducing agent, charcoal, sulfur and phosphorus; combustion produces toxic nitrogen oxides smoke.
Transportation and Storing CharacteristicsVentilated warehouse; light discharge; keep separate from sulfur, phosphorus, organic matter, reducing agent and charcoal tinder.
Chemical PropertiesWhite to yellow solid
Extinguishing AgentFog water and sand.
General DescriptionA white crystalline solid. Noncombustible but accelerates the burning of combustible materials. If large quantities are involved in fire or the combustible material is finely divided an explosion may result. May explode under prolonged exposure to heat or fire. Toxic oxides of nitrogen are produced in fires. Used in solid propellants, explosives, fertilizers, and for many other uses.
Air & Water ReactionsSoluble in water.
Reactivity ProfileA mixture of Sodium nitrate and sodium hypophosphite constitute a powerful explosive [Mellor 8, Supp. 1:154 1964]. Sodium nitrate and aluminum powder mixtures have been reported to be explosive,[Fire, 1935, 28, 30]. The nitrate appears to be incompatible with barium thiocyanate, antimony, arsenic trioxide/iron(II) sulfate, boron phosphide, calcium-sodium alloy, magnesium, metal amidosulfates, metal cyanides, powdered charcoal, peroxyformic acid, phenol/trifluoroacetic acid, sodium, sodium nitrite/sodium sulfide, sodium phosphinate, sodium thiosulfate, tris( cyclopentadienyl)cerium, and even wood [Bretherick 5th ed., 1995].
Health HazardINGESTION: Dizziness, abdominal cramps, vomiting, bloody diarrhea, weakness, convulsions, and collapse. Small repeated doses may cause headache and mental impairment.
Tag:Sodium nitrate(7631-99-4) Related Product Information
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