Hydride/steam generation
Holak first used hydride generation in 1969 for the determination of arsenic by atomic absorption. He puts zinc into a sample solution acidified with hydrochloric acid to produce hydrogen, and then collects the arsine in a trap cooled with liquid nitrogen. After the reaction, he warmed the trap and introduced the arsine into the argon/hydrogen diffusion flame with a stream of nitrogen to measure the atomic absorption of arsenic.
Many representative elements of Groups IV, V, and VI of the Periodic Table of the Elements (As, Sb, Bi, Ge, Sn, Pb, Se, Te) can form volatile covalent hydrides with new ecological hydrogens. The advantages of hydrides are evident in the separation and enrichment of the elements to be tested, thus alleviating or even completely eliminating interference. There are two processes in its occurrence:
(1) Process hydride released from the sample solution, i.e. the analysis of materials in acidic solution, the conversion of hydrogen by reaction with gaseous hydride; hydride generation must have a process of generating a hydrogen atom, usually a metal and an acid or a boron hydride alkali Metal salts are achieved as reducing agents. In the early days, a metal/acid system was used. The most commonly used metal was zinc, which reacted with hydrochloric acid to form a new ecological hydrogen, and the analyte was reduced to a hydride.
(2) The gaseous hydrogen liberated in the solution is sent to the atomizer or ionizer by the carrier gas.
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