Cold Atomic Fluorescence Mercury Analyzer / Mercury Analyzer

The Cold Atom Fluorescence Mercury Analyzer is a dedicated mercury measurement instrument that can accurately measure trace mercury in air, water soil, food minerals, biological samples and cosmetics. It has a high degree of automation, easy operation, low detection limit, and accurate measurement results. Such characteristics can be widely used in environmental testing, food hygiene, water, medical, chemical, hydrology, geology and other departments.

Principle: The low-pressure mercury lamp emits a 253.7 nm line, irradiates the mercury vapor generated in the sample to be measured, mercury atoms fluoresce in the fire, and is converted into an electric signal by a photomultiplier tube. After amplification, A/D conversion, the data is generated by the single-chip microcomputer. Processing, LED display, print out test results.

The instrument uses excess stannous chloride to fully react with mercury chloride in the sample. The reaction formula is as follows:

HgCl2 snCl2-SnCl2 Hg (gas)

The generated mercury vapor is ejected from the atom nozzle by the carrier gas, and is irradiated by the excitation light with a wavelength of 253.7 nm emitted from the low mercury lamp. The ground state mercury atoms are excited to a high energy state and radiate resonance when returning to the ground state. Fluorescence, this fluorescence is focused on a photomultiplier tube by a condenser lens, photoelectric conversion is achieved, the photocurrent is amplified (recordable peaks can be recorded by a recorder), A/D conversion is performed by the computer, and the calculation result can be printed.

When the concentration of mercury is very low, the fluorescence intensity is in a good linear relationship with the concentration of mercury and can be used for the quantitative determination of trace amounts of mercury.

It should be pointed out that the excited mercury atom emits fluorescence instead of spontaneously returning to the ground state, and it also collides with the background particle and converts the energy into thermal motion of the particle, resulting in a transition without fluorescence radiation and a decrease in fluorescence intensity. This is the phenomenon of atomic fluorescence quenching. Since the chance of collision of excited mercury atoms with argon is much smaller than that of nitrogen, oxygen, and carbon dioxide in the air, the fluorescence quenching caused is much smaller. Therefore, when using argon as the gas source, the sensitivity of the instrument is higher than that of nitrogen. Much more. Similarly, during the measurement process, the instrument is required to avoid intrusion of air into the excitation zone to reduce the fluorescence phenomenon caused by this and increase the stability of the instrument.

main indicators:

1, detection limit: Ar0.01ng/mlN20.05ng/ml

2. Noise: <±0.02mv in 1h

3, the correlation coefficient: r> 0.999

4, zero drift: within 1h <±0.05mv

5, relative standard deviation: CV ≤ 4%

6, size and weight 475×420×245mm15kg

The Cold Atom Fluorescence Mercury Analyzer is a dedicated mercury measurement instrument that can accurately measure trace mercury in air, water soil, food minerals, biological samples and cosmetics. It has a high degree of automation, easy operation, low detection limit, and accurate measurement results. Such characteristics can be widely used in environmental testing, food hygiene, water, medical, chemical, hydrology, geology and other departments.

Principle: The low-pressure mercury lamp emits a 253.7 nm line, irradiates the mercury vapor generated in the sample to be measured, the mercury atoms radiate out of the fire, and is converted into an electric signal by a photomultiplier tube. After amplification and A/D conversion, the data is generated by the single-chip microcomputer. Processing, LED display, print out test results.