• USA Home
  • 92823 - Picrylsulfonic acid solution

92823 Sigma

Picrylsulfonic acid solution

~1 M in H2O

Synonym: 2,4,6-Trinitrobenzenesulfonic acid solution, TNBS

  • CAS Number 2508-19-2

  • Empirical Formula (Hill Notation) C6H3N3O9S

  • Molecular Weight 293.17

  •  Beilstein Registry Number 572358

  •  MDL number MFCD00064382

  •  PubChem Substance ID 57653494



Related Categories Amines, Analytical Reagents, Analytical/Chromatography, Derivatization Reagents, Derivatization Reagents TLC,
concentration   ~1 M in H2O
density   1.14 g/mL at 20 °C
shipped in   dry ice
storage temp.   −20°C



decomposes when stored at temperatures ≥0°C with precipitate formation (picric acid)

Other Notes

Sales restrictions may apply


Hydrophilic modifying reagent. Derivatives with amino compounds can be regenerated with hydrazine.

Safety & Documentation

Safety Information

Signal word 
Hazard statements 
Precautionary statements 
Supplemental Hazard Statements 
Explosive when dry.
UN3379 - DOT UN3265_PG_1 class 3 - PG 1 - Desensitized explosive, liquid, n.o.s. (Diethyl Azodicarboxylate 40% solution in toluene)
WGK Germany 


Certificate of Analysis

Frequently Asked Questions

Which document(s) contains shelf-life or expiration date information for a given product?
If available for a given product, the recommended re-test date or the expiration date can be found on the Certificate of Analysis.
How do I get lot-specific information or a Certificate of Analysis?
The lot specific COA document can be found by entering the lot number above under the "Documents" section.
Do we have information on freeze/thaw stability of Product 92823, Picrylsulfonic acid solution?
We have never tested freeze/thaw stability of this product. However, if stored at temperatures greater than 0°C the product will decompose and a precipitation of picric acid will begin to form.
How do we ship Product 92823, Picrylsulfonic acid solution?
To ensure the quality of this product, we ship it on wet ice.
What is our recommended disposal of Product 92823, Picrylsulfonic acid solution?
We would recommend you contact a licensed waste disposal company in your area for the disposal of this chemical.
What is the shelf life of Product 92823, Picrylsulfonic acid solution?
For this product, we assign a recommended retest date which is published on the bottom of the Certificate of Analysis. The Re-test date may be extended subject to quality review. If extended, a new QC release date and recommended re-test date will be published on the bottom of the Certificate of Analysis. If you want to guarantee the shelf life of your product we would recommend calling technical service at 800-231-8327 and we will be able to tell you what lots we have in stock and when they will be retested.
How do I find price and availability?
There are several ways to find pricing and availability for our products.Once you log onto our website, you will find the price and availability displayed on the product detail page.You can contact any of our Customer Sales and Service offices to receive a quote. USA customers: 1-800-325-3010 orview local office numbers.
What is the Department of Transportation shipping information for this product?
Transportation information can be found in Section 14 of the product's (M)SDS.To access the shipping information for this material, use the link on the product detail page for the product.
My question is not addressed here, how can I contact Technical Service for assistance?
Ask a Scientist here.
Show more questions
Protocols & Articles
Peer-Reviewed Papers


Related Products

Technical Service:

Our team of scientists has experience in all areas of research including Life Science, Material Science, Chemical Synthesis, Chromatography, Analytical and many others.

Bulk Ordering & Pricing:

Need larger quantities for your development, manufacturing or research applications?