... methods for trace organics. In Chapter 2, we showed 120 Trace Environmental Quantitative Analysis, Second EditionMatrix solid-phase dispersion 25 1Solid-phase microextraction (SPME) 25 5Stir Bar ... (SFE) 20 0Reversed-phase solid-phase extraction (RP-SPE) 21 1© 20 06 by Taylor & Francis Group, LLC130 Trace Environmental Quantitative Analysis, Second Editionestablished whereby hydronium and ... deter-minative step.9 The analytes of interest are the class of chlorophenoxy acid herbicides(CPHs) and include 2, 4-dichlorophenoxyacetic acid (2, 4-D), 2, 4,5-trichlorophe-noxyacetic acid (2, 4,5-T),...