Chlorpyrifos

Chlorpyrifos structural formula

CAS Number2921-88-2
Molecular FormulaC9H11Cl3NO3PS
Molecular Weight350.571
InChI KeySBPBAQFWLVIOKP-UHFFFAOYSA-N
LogP4.96
Synonyms
  • Chlorpyrifos
  • O,O-Diethyl O-(3,5,6-trichloropyridin-2-yl) phosphorothioate
  • Phosphorothioic acid, O,O-diethyl O-(3,5,6-trichloro-2-pyridinyl) ester
  • 2921-88-2
  • Dursban
  • CPF
  • Chlorpyriphos
  • O,O-Diethyl-o-(3,5,6-trichloro-2-pyridyl)phosphorothiolate
  • Phosphorothioic acid, O,O-diethylO-(3,5,6-trichloro-2-pyridinyl) ester
  • Bonidel
  • Chloroban
  • Chloropyrifos
  • Chloropyrifos-ethyl
  • Chloropyriphos
  • Chlorpyrifos E
  • Chlorpyrifos-ethyl
  • Clorpiran
  • Clorpirifos
  • Coroban
  • Danusban
  • Dhanusban
  • Dursban 10CR
  • Dursban Pro
  • Dursban R
  • Dursban TC
  • Dursband
  • Dursband 48
  • Emperor
  • Ethyl chlorpyriphos
  • Geodinfos
  • Killmaster
  • Lentrek
  • Lock-On
  • Lorsban
  • Lorsban 50SL
  • O,O-DIETHYL O-(3,5,6-TRICHLORO-2-PYRIDINYL PHOSPHOROTIOATE)
  • O,O-Diethyl O-(3,5,6-trichloro-2-pyridinyl)phosphorothioate
  • O,O-Diethyl O-(3,5,6-trichloro-2-pyridyl) phosphorothioate
  • O,O-Diethyl O-(3,5,6-trichloro-2-pyridyl) thiophosphate
  • O,O-Diethyl-O-(3,5,6-trichloro-2-pyridyl)phosphorothioate
  • O,O-Diethyl-O-3,5,6-trichloro-2-pyridylphosphorothionate
  • PHOSPHOROTHIOATE, O,O-DIETHYL O-(3,5,6-TRICHLORO- 2-PYRIDYL)
  • Phosphorothioic acid, O,O-diethyl O-(3,5,6-trichloro-2-pyridinyl) ester
  • Phosphorothioic acid, O,O-diethyl O-(3,5,6-trichloro-2-pyridyl) ester
  • Pyrifos
  • Pyrinex
  • Spannit
  • Stipend
  • suScon Green
  • Tafaban
  • Xinnongba
  • BRN 1545756
  • Caswell No. 219AA
  • Chlorpyrifos ethyl
  • Chlorpyriphos-ethyl
  • Detmol U.A.
  • Detmol ua
  • O,O-Diethyl O-(3,5,6-trichloro-2-pyridyl) phsophorothioate
  • Dursban F
  • EINECS 220-864-4
  • EPA Pesticide Chemical Code 059101
  • Piridane
  • 2-Pyridinol, 3,5,6-trichloro-, O-ester with O,O-diethyl phosphorothioate
  • suSCon Blue
  • O,O-Diaethyl-O-3,5,6-trichlor-2-pyridylmonothiophosphat
  • UNII-JCS58I644W
  • O,O-diethyl O-(3,5,6-trichloropyridin-2-yl) thiophosphate
  • Trichlorpyrphos
  • m-Chlorpyrifos
  • 12768-48-8
  • 39475-55-3

Applications:

UV-Vis Spectrum of Chlorpyrifos

December 19, 2025
Access the UV-Vis Spectrum SIELC Library
UV-Vis Spectrum of Chlorpyrifos.

If you are looking for optimized HPLC method to analyze Chlorpyrifos check our HPLC Applications library

For optimal results in HPLC analysis, it is recommended to measure absorbance at a wavelength that matches the absorption maximum of the compound(s) being analyzed. The UV spectrum shown can assist in selecting an appropriate wavelength for your analysis. Please note that certain mobile phases and buffers may block wavelengths below 230 nm, rendering absorbance measurement at these wavelengths ineffective. If detection below 230 nm is required, it is recommended to use acetonitrile and water as low UV-transparent mobile phases, with phosphoric acid and its salts, sulfuric acid, and TFA as buffers.
For some compounds, the UV-Vis Spectrum is affected by the pH of the mobile phase. The spectra presented here are measured with an acidic mobile phase that has a pH of 3 or lower.

 

 

 

Application Analytes:
Chlorpyrifos
SIELC Technologies usually develops more than one method for each compound. Therefore, this particular method may not be the best available method from our portfolio for your specific application. Before you decide to implement this method in your research, please send us an email to research@sielc.com so we can ensure you get optimal results for your compound/s of interest.

Separation of Chlorpyrifos on Newcrom R1 HPLC column

February 16, 2018
Separation of Chlorpyrifos on Newcrom C18 HPLC column

Chlorpyrifos can be analyzed by this reverse phase (RP) HPLC method with simple conditions. The mobile phase contains an acetonitrile (MeCN), water, and phosphoric acid. For Mass-Spec (MS) compatible applications the phosphoric acid needs to be replaced with formic acid. Smaller 3 µm particles columns available for fast UPLC applications. This liquid chromatography method is scalable and can be used for isolation impurities in preparative separation. It also suitable for pharmacokinetics.

Application Column

Newcrom R1

The Newcrom columns are a family of reverse-phase-based columns. Newcrom A, AH, B, and BH are all mixed-mode columns with either positive or negative ion-pairing groups attached to either short (25 Å) or long (100 Å) ligand chains. Newcrom R1 is a special reverse-phase column with low silanol activity.

Select options
Application Analytes:
Chlorpyrifos
The result was obtained by a proprietary SIELC algorithm. It may deviate from the actual experimental data. The experimental data are available upon request. Contact us before ordering the column as there may be a more suitable column alternative by either e-mail: support@sielc.com or by phone: 847-229-2629.