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Effect of Organic Modifier on Basic Analyte pA Shift

1 Effect of Organic Modifier on Basic Analyte pA Shift [Pg.182]

In order for proper description of the basic analyte retention versus the mobile-phase IpH, the pH shift of the aqueous portion of the mobile phase must be [Pg.182]

TABLE 4-11. Retention Volnme of Aniline as a Fnnction of IpH (10-50 v/v% Acetonitrile) [Pg.184]

TABLE 4-12. IpK, Values of Basic Conipouuds as a Fuuctiou of Acetouitrile Compositiou [Pg.185]

50 v/v% acetonitrile were obtained (R 0.98) (Table 4-12). The downward change in pKa as a function of the v/v% MeCN between 0 and 50 v/v% MeCN agreed well with the IpK values determined by Espinosa et al. [93] for aniline, 0.14 pKa unit decrease per 10 v/v% acetonitrile, and 4-chloro aniline 0.18 pK unit decrease per 10 v/v% acetonitrile. [Pg.186]




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Analytical Effects

Basic Analytes effect

Basic analyte*

Basic analytes

Basic modifiers

Basicity effect

Basicity shift

Effect of organic modifier

Modifier effectiveness

Modifier effects

Organic analytes

Organic modifier effect

Organic modifier effect analytes

Organic modifiers

Organically modified

Shift effects

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