Why is the catalytic current so useful to trace analysis of number of transition metals? 

The catalytic current is a useful tool in trace analysis of transition metals due to its sensitivity and selectivity in detecting low concentrations of these metals in a sample.

The catalytic current is a current that occurs at an electrode surface when a reactant species is electrochemically oxidized or reduced in the presence of a catalyst. In the case of trace analysis of transition metals, the metal ions in the sample act as the catalyst, and a reactant species such as hydrogen peroxide or oxygen is used to generate the catalytic current.

The sensitivity of the catalytic current arises from the fact that it is directly proportional to the concentration of the metal ions in the sample. Thus, even low concentrations of metal ions can generate a measurable catalytic current. Additionally, the selectivity of the catalytic current comes from the fact that __________ ______ __________ _________ _______ ________ __________ ________ ___ __________ _________.
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