Cupferron
Cupferron (CAS 135-20-6), with the chemical formula C6H5N(NO)ONH4 and a molecular weight of 155.15 g/mol, is a nitroso compound. It serves as a valuable reagent in analytical chemistry, primarily for the gravimetric determination of certain metal ions. It is also employed as a precipitating agent and in organic synthesis as a building block. Tech Serve Solutions supplies Cupferron for research and industrial applications.
- IUPAC
- N-Nitroso-N-phenylhydroxylamine ammonium salt
- Synonyms
- N-Nitroso-N-phenylhydroxylamine ammonium salt

Metal Ion Determination
Cupferron is widely used in gravimetric analysis for the quantitative precipitation and determination of various metal ions, including iron, titanium, vanadium, and zirconium. Its ability to form insoluble complexes facilitates their separation and measurement.
Precipitating Agent
Beyond quantitative analysis, Cupferron functions as a general precipitating agent in various chemical processes. This property is useful for separating specific metallic species from complex mixtures in laboratory settings.
Organic Synthesis Building Block
As an organic building block, Cupferron, also known as N-Nitroso-N-phenylhydroxylamine ammonium salt, can be utilised in the synthesis of more complex organic molecules. Its unique functional groups offer possibilities for diverse chemical transformations.
| Molecular weight | 155.15 |
|---|---|
| Linear formula | C6H5N(NO)ONH4 |
| Storage temperature | 2-8°C |
| Melting point | 150-155 °C (dec.)(lit.) |


Hazard statements
- H301Toxic if swallowed
- H315Causes skin irritation
- H319Causes serious eye irritation
- H335May cause respiratory irritation
- H351Suspected of causing cancer
Precautionary statements
- P261Avoid breathing dust, fume, gas or vapours
- P281Use personal protective equipment as required
- P301IF SWALLOWED
- P305IF IN EYES
| Protective equipment | Eyeshields, Faceshields, Gloves, type P2 (EN 143) respirator cartridges |
|---|---|
| Transport (UN / ADR) | UN 2811 6.1 / PGIII |
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | T |
| Risk statements (R) | 25-36/37/38-40 |
| Safety statements (S) | 26-36/37-45 |
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 Cupferron used for?
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Cupferron is primarily used in analytical chemistry for the gravimetric determination of metal ions like iron, titanium, and vanadium. It also serves as a precipitating agent and a building block in organic synthesis.
What is the CAS number and chemical formula for Cupferron?
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The CAS number for Cupferron is 135-20-6, and its chemical formula is C6H5N(NO)ONH4.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies Cupferron, CAS 135-20-6, at a purity suitable for general laboratory and synthesis purposes. We do not represent this product as USP, BP, EP, or pharmacopoeia grade. Please refer to the product's Certificate of Analysis for specific assay details.
What are the main safety hazards associated with Cupferron?
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Cupferron is classified as toxic if swallowed (H301), causes skin irritation (H315), serious eye irritation (H319), and may cause respiratory irritation (H335). It is also suspected of causing cancer (H351). Always handle with appropriate personal protective equipment including eyeshields, face shields, gloves, and a P2 respirator cartridge, and ensure adequate ventilation. Refer to the Safety Data Sheet for full details.
How is Cupferron shipped and exported?
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Cupferron (UN 2811) is shipped as a hazardous material under Packing Group III, class 6.1 (Toxic substances). Tech Serve Solutions complies with all international shipping regulations for the export of chemicals.
How can I request a sample or quote for Cupferron?
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To request a sample or a quote for Cupferron, please visit the Tech Serve Solutions website and use our online enquiry form, or contact our sales team directly with your requirements.
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