Free radicals have been used as reductants and applied to
vapor generation of many elements, including Hg. Photochemically
induced (PI)-CVG, which utilizes a photoreaction process
based on UV-vis irradiation,5,10-14 is a newly emerging vaporgeneration
method. Hydrogen and carboxyl radicals that arise
from photodissociation of low molecular weight organic acids (e.g.,
formic, acetic, and propionic) are employed to reduce mercury
ions to the neutral vapor. This process obviates the need for
expensive and high-purity reducing reagents (i.e., NaBH4 or
SnCl2), is amenable to speciation analysis with or without
chromatographic separation, and is less prone to interference from
concomitant ions.
Free radicals have been used as reductants and applied tovapor generation of many elements, including Hg. Photochemicallyinduced (PI)-CVG, which utilizes a photoreaction processbased on UV-vis irradiation,5,10-14 is a newly emerging vaporgenerationmethod. Hydrogen and carboxyl radicals that arisefrom photodissociation of low molecular weight organic acids (e.g.,formic, acetic, and propionic) are employed to reduce mercuryions to the neutral vapor. This process obviates the need forexpensive and high-purity reducing reagents (i.e., NaBH4 orSnCl2), is amenable to speciation analysis with or withoutchromatographic separation, and is less prone to interference fromconcomitant ions.
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