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

Abstract

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.

Description

[0001] technical field [0002] The invention relates to a device for on-line monitoring of the content of heavy metal elements in water by applying the principle of atomic fluorescence spectroscopy. Background of the invention [0003] The pollution of toxic and harmful heavy metals (such as lead, arsenic, cadmium, mercury, etc.) in water has the characteristics of low content and great harm. In particular, it is easy to accumulate in organisms, which has a very large adverse effect on ecosystems and human health. In order to timely and accurately reflect and understand the existence of heavy metals in water and to control them, the on-line monitoring of these heavy metals has been gradually paid attention to in recent years. However, there are unavoidable technical obstacles in the online analysis of heavy metals, mainly as follows: [0004] 1. Visible spectrophotometry is the most widely used in online analysis. This method has the advantages of mature technology, stabl...

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Problems solved by technology

However, compared with other analytical methods, the stability and repeatability of the electrochemical method are poor, especially in the face of environmental water samples with poor cleanliness, the drift caused by electrode contamination is inevitable

In addition, due to the low maintenance rate of the instrument required for on-site testing, and the poor cleanliness of the samples entering the instrument, the life of the electrode is significantly affected, and there are many repairs and replacements of the electrode, which greatly increases the operating cost of the equipment;

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