PNTOSA
Para Nitro Toluene Ortho Sulphonic Acid
Molecular Formula
C₇H₇NO₅S
Molecular Weight
217.20 g/mol
Appearance
White to off-white crystalline powder / wet cake
CAS Number
121-03-9
Specifications
| Parameter | Specification |
|---|---|
| Appearance | White to off-white crystalline powder / wet cake |
| Purity (by Nitrite value) | Min. 82% (Technical) / Min. 99% (HPLC, Pure grade) |
| Free Acidity (as H₂SO₄) | Max. 2.0% |
| Insoluble Matter | Max. 0.2% |
| Moisture | Max. 3.0% |
| Solubility | Clear solution at 50% in water |
| Melting Point | 133–135°C |
| Molecular Weight | 217.20 g/mol |
| Molecular Formula | C₇H₇NO₅S |
Quality & Testing Methods
HPLC (High Performance Liquid Chromatography)
Purity determination — C18 reverse phase column, mobile phase: acetonitrile:water with 0.1% H₃PO₄, UV detector at 254 nm
Nitrite Value Titration
Reduction with Zn/HCl followed by diazotisation with 0.1N NaNO₂, endpoint by starch-iodide paper
Karl Fischer Titration
Moisture determination per ASTM E203
Gravimetric Analysis
Insoluble matter — filtered through 0.45μm membrane, dried at 105°C
Solubility Test
Visual clarity at 50% concentration in water
Melting Point
Automated melting point apparatus
Applications
Packaging
- 25 kg HDPE bags
- 50 kg HDPE bags
- Jumbo bags (500/1000 kg)
- Custom packaging available
Labelling: GHS/REACH compliant labelling. Export packaging available.
Incoterms: FOB Dahej/Nhava Sheva, CIF, CFR available.
Shipping
- Export to EU, USA, South-East Asia, Middle East, Africa
- GHS-compliant Safety Data Sheets (SDS) provided
- UN dangerous goods classification as applicable
- COA (Certificate of Analysis) with every shipment
Safety Information
Signal Word
Warning
Hazard Classification
Irritant (Skin/Eye)
GHS Pictograms
Storage Conditions
Store in cool, dry, well-ventilated area. Keep away from moisture and strong alkalis.
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