Chapter: Modern Analytical Chemistry: Obtaining and Preparing Samples for Analysis

Classifying Separation Techniques: Separations Based on Complexation Reactions (Masking)

One of the most widely used techniques for preventing an interference is to bind the interferent as a soluble complex, preventing it from interfering in the analyte’s deter- mination.

Separations Based on Complexation Reactions (Masking)

One of the most widely used techniques for preventing an interference is to bind the interferent as a soluble complex, preventing it from interfering in the analyte’s deter- mination. This process is known as masking.

Technically, masking is not a separation technique because the analyte and interferent are never physically separated from each other. Masking can, however, be considered a pseudo-separation technique, and is in- cluded here for that reason. A wide variety of ions and molecules have been used as masking agents (Table 7.6), and, as a result, selectivity is usually not a problem.

As shown in Example 7.13, a masking agent’s effectiveness can be judged by considering the equilibrium constants for the analytical and masking reactions.

Study Material, Lecturing Notes, Assignment, Reference, Wiki description explanation, brief detail

Modern Analytical Chemistry: Obtaining and Preparing Samples for Analysis : Classifying Separation Techniques: Separations Based on Complexation Reactions (Masking) |