Analytical Development for Detecting Femtomole-Level Organophosphorus Compounds in Biogeochemical Samples by Ion...

Area of Science:

• Environmental chemistry
• Analytical chemistry
• Biogeochemistry

Background:

• Phosphorus (P) is essential for life, with organic forms critical in biology.
• Analyzing organophosphorus compounds in environmental samples is key to understanding the P biogeochemical cycle.
• Current analytical methods may lack the sensitivity or resolution for complex environmental matrices.

Purpose of the Study:

• To develop a high-sensitivity, high-resolution analytical technique for detecting organophosphorus compounds.
• To enable precise quantification and molecular identification of organophosphorus compounds in environmental samples.
• To validate the technique's applicability in complex natural environments.

Main Methods:

• Development of an analytical technique combining ion chromatography (IC) with Orbitrap-mass spectrometry (Orbitrap-MS).
• Separation of organophosphorus compounds (alkyl phosphonates, alkyl phosphates) from other substances using IC.
• Online coupling of IC with Orbitrap-MS for sensitive detection and identification.

Main Results:

• The IC-Orbitrap-MS method achieved high sensitivity, detecting organophosphorus compounds at concentrations as low as ~10 fmol.
• The technique successfully separated and identified organophosphorus compounds amidst complex organic and inorganic interferences.
• Feasibility was demonstrated by analyzing organophosphorus compounds in deep-sea sediment samples.

Conclusions:

• The developed IC-Orbitrap-MS method offers a powerful tool for sensitive and specific analysis of organophosphorus compounds.
• This technique advances the study of phosphorus biogeochemistry in terrestrial and marine environments.
• The method has potential applications in astrobiology and extraterrestrial sample analysis.