Thin-film photochemical vapour generation

摘要

A photochemical vapor generator is disclosed having a reaction chamber with a liquid sample inlet, a carrier gas inlet and a carrier gas outlet. A liquid sample support surface for supporting a film of a liquid sample is in the reaction chamber. A source of ultraviolet radiation is positioned in radiative contact with the liquid sample support surface. Also described is a process for detecting and/or quantifying an analyte by providing a liquid film of a sample containing an organic acid or a salt thereof and a precursor compound of the analyte, exposing the liquid film to ultraviolet radiation to generate a volatile species of the analyte, separating the volatile species from the liquid film to form a vapor containing the volatile species, and directing the vapor to a detector to detect and/or quantify the analyte in the vapor. Amalgamation of photochemical reactions with thin film generation and gas-liquid phase separation achieves the benefits of all of these principles in a single unit, providing a simple and effective way of enhancing generation of an expanded suite of elements.

主权项

1. A photochemical vapour generator comprising: a reaction chamber having a liquid sample inlet, a carrier gas inlet and a carrier gas outlet; a liquid sample support surface for supporting a film of a liquid sample in the reaction chamber; and a source of ultraviolet radiation positioned in radiative contact with the liquid sample support surface, the ultraviolet source comprising an ultraviolet lamp or an ultraviolet LED, and the ultraviolet source further comprising:
a coil that surrounds the reaction chamber and the liquid sample support surface, or straight discharge tubes configured around the reaction chamber and the liquid sample support surface and running up and down a length of the reaction chamber.