o-Tolidine
o-Tolidine (CAS: 119-93-7), chemical formula [-C6H3(CH3)-4-NH2]2, is an organic compound with a molecular weight of 212.29 g/mol. It is recognised for its utility as a sensitive colorimetric reagent. Primarily, o-Tolidine is employed for the detection of free chlorine in water and as a reagent for identifying gold. Tech Serve Solutions supplies this chemical for laboratory and industrial applications.
- IUPAC
- 3,3′-Dimethylbenzidine,4,4′-Bianisidine
- Synonyms
- 3,3′-Dimethylbenzidine4,4′-Bianisidine
![o-Tolidine ([-C6H3(CH3)-4-NH2]2) — chemical structure, CAS 119-93-7; Chemistry, fine chemical supplied by Tech Serve Solutions](/_next/image?url=https%3A%2F%2Fpub-f4d920c906024441a773a96f7098e551.r2.dev%2Fimages%2Fproducts%2F119-93-7.png&w=3840&q=75)
Chlorine Detection
o-Tolidine serves as a sensitive colorimetric reagent for the detection of free chlorine in water. The reaction produces a distinct colour change, allowing for qualitative and quantitative analysis.
Gold Detection
This compound is utilised as a colour-forming reagent in analytical chemistry for the sensitive detection of gold. Its application aids in identifying the presence of this precious metal.
Chemical Synthesis
As an organic building block, o-Tolidine can be incorporated into various chemical synthesis pathways. Its structure makes it suitable for the creation of more complex organic molecules.
| Molecular weight | 212.29 |
|---|---|
| Linear formula | [-C6H3(CH3)-4-NH2]2 |
| Assay | ≥97.0% (calc. based on dry substance, NT) |
| Impurities tested | ~15% water |
| Application | Sensitive colorimetric reagent for gold and for free chlorine in water. |
| Melting point | 128-131 °C(lit.) |
Hazard statements
- H302Harmful if swallowed
- H350May cause cancer
- H411Toxic to aquatic life with long-lasting effects
Precautionary statements
- P201Obtain special instructions before use
- P273Avoid release to the environment
- P308IF exposed or concerned
| Protective equipment | Eyeshields, Faceshields, full-face particle respirator type N100 (US), Gloves, respirator cartridge type N100 (US), type P1 (EN143) respirator filter, type P3 (EN 143) respirator cartridges |
|---|---|
| Flash point | 100 °C / 212 °F |
| Transport (UN / ADR) | UN 3077 9 / PGIII |
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | T,N |
| Risk statements (R) | 45-22-51/53 |
| Safety statements (S) | 53-45-61 |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
Documentation
Every batch ships with a Certificate of Analysis covering assay, identity and purity; the grade is confirmed against your enquiry. Safety Data Sheets and technical data sheets are available on request.
Supply & logistics
Samples for technical evaluation; bulk MOQ by grade and packaging. In-stock material ships in 7–10 working days, worldwide, with full export documentation.
What is o-Tolidine used for?
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o-Tolidine is primarily used as a sensitive colorimetric reagent for detecting free chlorine in water and as a reagent for the detection of gold.
What are the CAS number and chemical formula for o-Tolidine?
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The CAS number for o-Tolidine is 119-93-7, and its chemical formula is [-C6H3(CH3)-4-NH2]2.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies o-Tolidine with an assay of ≥97.0% (calculated based on dry substance, NT), containing approximately 15% water. We do not represent this product as USP, BP, or EP grade.
What are the main hazards associated with o-Tolidine?
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o-Tolidine is classified with GHS symbols indicating it is harmful if swallowed (H302), may cause cancer (H350), and is toxic to aquatic life with long-lasting effects (H411). Appropriate personal protective equipment, including eyeshields, gloves, and respiratory protection, must be used.
How is o-Tolidine packed and shipped?
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o-Tolidine is shipped as UN 3077, Hazard Class 9, Packing Group III. Specific packaging details are available upon request.
How can I request a sample or quote for o-Tolidine?
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To request a sample or a quote for o-Tolidine, please contact our sales team through the website or by phone.
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