Molekula
Potassium tellurite
Supplying 4,500+ customers in over 80 countries
ISO 9001:2015 & ISO 14001:2015 certified · Supplying laboratories and industry since 2000 · Listed pack sizes are a starting point — we manufacture, source and repack to the quantity you need
Potassium tellurite is an inorganic compound containing potassium, tellurium, and oxygen, primarily used as a selective inhibitory agent in microbiological media such as Baird-Parker agar and tellurite blood agar. There it suppresses Gram-negative and other unwanted bacteria while allowing tellurite-tolerant species such as Staphylococcus aureus and Corynebacterium diphtheriae to grow, reducing it to form black colonies. It is also employed in analytical chemistry for trace metal analysis. This chemical has a CAS number of 7790-58-1, with the molecular formula K2TeO3 and a molecular weight of 253.79. It should be stored at ambient conditions and handled with caution, as it carries a "Danger" signal word. Molekula supplies Potassium tellurite from research to bulk quantities with full documentation and ISO 9001:2015 traceability.
Example image for illustration only. Other packaging and pack sizes are available.
Pricing & pack sizes
These pack sizes aren't a limit. Molekula manufactures, sources and repacks to order — if you need 500 kg and only see 1 kg listed, . We quote from grams to multi-tonne.
Need a different size? Add the nearest pack and change the size in your basket — we price it at the same rate per unit.
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5 g — £29.50 per pack ex VAT · £35.40 inc. VAT
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Tell us how much you need and when — drums, IBCs, sacks or a one-off bulk lot. We'll manufacture or source it and come back with a price.
Prices exclude VAT/sales tax and shipping.
Specifications
| Property | Value |
|---|---|
| Appearance | Off white powder |
| Chloride (Cl-) | ≤ 0.01% |
| Purity | ≥ 98.0% |
| Iron (Fe) | ≤ 0.01% |
| Identification (IR) | Conforms to Reference |
| Sodium (Na) | ≤ 0.03% |
| Sulphates (SO4)(2-) | ≤ 0.02% |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Transport Class | 6.1 |
| Packing Group | III |
| Acidity | Neutral |
Identification
| Property | Value |
|---|---|
| SKU | 90021880 |
| CAS Number | 7790-58-1 |
| IUPAC Name | dipotassium;tellurite |
| EC Number | 232-213-1 |
| Molecular Formula | K2TeO3 |
| Molecular Weight | 253.79 |
| Exact Mass | 255.8184 |
| SMILES | [O-][Te](=O)[O-].[K+].[K+] |
| InChIKey | BFPJYWDBBLZXOM-UHFFFAOYSA-L |
| InChI | InChI=1S/2K.H2O3Te/c;;1-4(2)3/h;;(H2,1,2,3)/q2*+1;/p-2 |
| PubChem CID | 65186 |
| UN Number | UN3284 |
| REACH Code | Y110 |
| TSCA Listed | Yes |
| HTS Code | 28429010 |
| Tariff Code | 2842901090 |
Safety & GHS
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Toxic
GHS06
Hazard statements
- H301 Toxic if swallowed
- H315 Causes skin irritation
- H319 Causes serious eye irritation
- H335 May cause respiratory irritation
Precautionary statements
- P261 Avoid breathing dust/fume/gas/mist/vapours/spray
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P301+310 IF SWALLOWED: Immediately call a POISON CENTER or doctor/physician
- P301+330 IF SWALLOWED: Rinse mouth. Do NOT induce vomiting
- P302+352 IF ON SKIN: Wash with soap and water
- P305+351+338 IF IN EYES: Rinse with water for several minutes. Remove contact lenses if present and easy to do. Continue rinsing
Documents
Safety Data Sheets (SDS)
Available in English, French, German, Italian, Russian, Spanish.
Certificate of Analysis (CoA) by batch
Enter a lot or batch number to retrieve the CoA for that specific batch. We can generate one from spec data if no PDF is on file.
Synonyms
- BFPJYWDBBLZXOM-UHFFFAOYSA-L
- dipotassium tellurite
- Dipotassium trioxotellurate
- K2O3Te
- Kali Telluricosum
- Potassiium Tellurite (IV)
- Potassium tellurate(IV)
- Telluric acid (H2TeO3), dipotassium salt
- Telluric acid (H2TeO3), potassium salt (1:2)
- Telluric acid, dipotassium salt
Frequently asked questions
What is potassium tellurite (K₂TeO₃) commonly used for?
Potassium tellurite is primarily used in analytical chemistry as a reagent for detecting and quantifying certain organic compounds, including in microbiological media (e.g., selectively inhibiting mainly Gram-negative bacteria in selective media for staphylococci, corynebacteria and E. coli O157 such as CT-SMAC), and as a precursor in semiconductor and optical material synthesis.
What is the molecular formula and molecular weight of potassium tellurite?
The molecular formula is K₂TeO₃, and the molecular weight is 253.79 g/mol.
How should potassium tellurite be stored?
Store potassium tellurite at ambient temperature in a tightly sealed container, away from moisture and incompatible substances. Handle with care—it is classified as Danger under GHS.
What grades or purities of potassium tellurite does Molekula supply?
Molekula supplies potassium tellurite in analytical reagent (AR) grade for laboratory use. Bulk or custom purities may be available upon request—please inquire for specifications.
Can Molekula supply potassium tellurite in bulk quantities?
Yes, Molekula can supply potassium tellurite in bulk quantities (e.g., 5 kg, 25 kg, or larger), depending on stock and lead time. Contact our sales team for pricing and availability.
What documentation comes with a potassium tellurite order?
Each order includes a Certificate of Analysis (CoA), Material Safety Data Sheet (MSDS/SDS), and batch-specific documentation for traceability. Additional certifications (e.g., purity verification) can be provided upon request.
Ready to order or need a custom pack?
Tell us the product, grade, and quantity — Molekula usually responds within one working day with pricing and lead time.