masking reagent

masking reagent

[′mask·iŋ rē‚ā·jənt]
(analytical chemistry)
A substance that decreases the concentration of a free metal ion or ligand by conversion into an essentially unreactive form, thus preventing undesirable chemical reactions that would interfere with the determination. Also known as masking agent.
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The kit also contains a proprietary masking reagent to increase assay performance in a homogeneous format.