PropertyValueMolecular weight85.00 g/molMelting point306–308 °CBoiling / decomposition> 380 °C (decomposes)Density (solid, 25 °C)~2.26 g/cm³Density (molten, 350 °C)~1.90 g/cm³
Thermal Energy Storage Mechanisms
A. Sensible Heat Storage (Primary Mode)
Sodium nitrate stores heat efficiently by temperature rise:
Latent Heat Storage (Phase Change)
- Melts at ~306 °C
- Absorbs ~180 kJ/kg during phase transition
- Less commonly used alone due to:
- Phase segregation risks
Melting point reduced to ~220 °C
Operating range: 220–565 °C
Excellent thermal stability
Concentrated Solar Power (CSP)
Industrial waste-heat recovery
Thermal batteries
Molten-salt reactors (secondary coolant concepts)
High-temperature heat transport loops
- Nitrate ions (NO₃⁻) act as oxidizing agents
- Promote formation of a stable passive oxide film (Fe₂O₃ / Fe₃O₄) on steel
- Shift corrosion potential to more noble values
- Reduce metal dissolution rate
Most effective in neutral to alkaline pH (≥ 8)
Reduced effectiveness in acidic systems
InhibitorTypeNotesSodium nitrateAnodicEffective, economicalSodium nitriteAnodicStronger but more toxicSodium chromateAnodicVery effective but restrictedPhosphatesMixedSludge formation riskMolybdatesAnodicEnvironmentally safer, costly
Closed-loop cooling water systems
Heat exchangers (steel)
Hydrostatic pressure testing fluids
Concrete corrosion protection (rebar passivation)
Oilfield water systems
- Chloride: 800 ppm
- Required nitrate: ≥1200–2000 ppm NO₃⁻
- Maintain pH: 8.5–9.5
Sodium nitrate is an effective anodic corrosion inhibitor for steel in aqueous alkaline systems—but it must be carefully dosed. It should not be relied upon as an inhibitor in molten salt or high-temperature nitrate systems, where it behaves differently.
- 25 kg / 50 kg HDPE or PP bags
- Jumbo bags (1 MT)
- Bulk truck / container supply
- CIF / Ex-works Gujarat
Nitrate Peak Interference Testing (Ion Chromatography / Aqueous Analysis)
Below is a practical, validation-ready approach to identify, prove, and control nitrate (NO₃⁻) peak interferences, tailored for high-salt, sulfate-rich, and formulation matrices—which matches the type of work you’ve been discussing recently.
InterferentTypical IssueNitrite (NO₂⁻)Partial overlap / shoulderChlorate (ClO₃⁻)Same elution windowBromate (BrO₃⁻)Conductivity enhancementIodate (IO₃⁻)Late-eluting overlapFormate / AcetateEarly baseline disturbanceSulfate (SO₄²⁻)Suppressor overload, peak masking
Prepare solutions at 2–5× expected matrix level:
- Nitrite
- Chloride
- Sulfate
- Phosphate
- Acetate / formate
Acceptance
- No peak at nitrate RT ± 0.1 min
- Resolution (Rs) ≥ 1.5
TestCriterionRT shift≤ ±0.05 minArea change≤ ±5%Peak symmetry0.8–1.5
- Nitrate std (10 ppm)
- Sulfate (500–2000 ppm)
✔ Nitrate peak must remain:
- Identifiable
- Above noise (S/N ≥ 10)
- No flattening
Prepare matrix at:
- 100%, 75%, 50%, 25%
Plot:
- Dilution factor vs nitrate area
✔ R² ≥ 0.995 → no hidden interference
ParameterRequirementRs (NO₂⁻ / NO₃⁻)≥ 1.5Theoretical plates≥ 2000Tailing factor≤ 2.0RSD (area, n=5)≤ 2%
TechniquePurposeUV detection (210 nm)Confirms nitrate chromophoreIC-MS (ESI-)Absolute identityAlternate column chemistryConfirms selectivityDifferent eluent strengthShifts nitrate RT
Nitrate peak suppressed?
→ Check suppressor capacity / sulfate load
Peak shoulder?
→ Suspect nitrite or chlorate
Area increases with chloride?
→ Conductivity enhancement artifact
RT drifting?
→ Carbonate contamination or eluent aging
Include in report:
- Chromatograms (blank, spike, forced interference)
- RT & Rs tables
- Area bias calculations
- Justification of interferent levels
- Conclusion on specificity
No significant interfere.nce observed at the retention time of nitrate when potential anionic interferents were present at up to 5× matrix levels. Peak purity,ution criteria were met
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