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Aminomethylphosphonic acid (AMPA) is a weak organic acid with a phosphonic acid group.<br />Tea is one of the most popular beverages in the world after water, and it is brewed by steeping tea leaves/buds in hot/boiling water to make tea infusions. The tea is cultivated in old orchards, which provide an ideal setting for weed development, which is progressively controlled by herbicides like GLYP or GLUF. Consequently, there is increasing concern that tea infusions may be a source of herbicide residues’ exposure to humans. Therefore, it is essential to determine the concentration of GLYP and GLUF and their primary metabolites aminomethylphosphonic acid (AMPA) and 3-(methylphosphinico)propionic acid (MPPA) in tea infusions.<br />This service provides two analytical procedures using dual-channel capillary electrophoresis-coupled contactless conductivity detection (CE-C4D) followed by solid-phase extraction (SPE) for simultaneous determination of glyphosate (GLYP), glufosinate (GLUF), and their two major metabolites, aminomethylphosphonic acid (AMPA) and 3-(methylphosphinico) propionic acid (MPPA), respectively, in a popular beverage such as tea infusions.