On-line in-water heavy metal monitor based on atomic fluorescence spectroscopy

The invention relates to an on-line in-water heavy metal monitor based on atomic fluorescence spectroscopy. The monitor comprises a feeding-reacting system, an atomization system and an optical system, wherein the feeding-reacting system is used for quantitatively introducing a water sample or a standard solution into an instrument to be reacted with a reducing agent so as to generate heavy metal hydride in a gas state; the heavy metal hydride is carried by a carrier gas and enters the automation system after being subjected to water-gas separation; the hydride in the gas state is decomposed into metal atoms at appropriate temperature; under the triggering action of a specific wavelength triggering light of the optical system, the metal atoms in the gas state generate resonance or non-resonance fluorescence; and by measuring the fluorescence intensity, the quantitative result of the heavy metal element is obtained. The advantages of the atomic fluorescence spectroscopy analysis principle is sufficiently utilized, the rapid high-sensitivity on-line monitoring on the in-water heavy metal elements is realized, and the problem of analysis interference is avoided to the maximum extent.