UV fluorescence sulfur analyzer is an instrument used for quantitative analysis of sulfur content in samples. It mainly adopts the principle of UV fluorescence method for determination and is widely used in fields such as petrochemicals, environmental protection, and food safety.
The sample is oxidized in a high-temperature cracking furnace to produce sulfur dioxide (SO ₂), which is then dried and dehydrated before entering the detection room. Sulfur dioxide is excited by ultraviolet light to produce specific wavelength fluorescence, and the fluorescence intensity is proportional to the sulfur content. It is detected by a photomultiplier tube and converted into an electrical signal to calculate the sulfur content.
The core principle of UV fluorescence sulfur analyzer is to use the fluorescence characteristics of sulfur element under specific conditions for quantitative analysis. The specific process is as follows:
Sample cracking: Introduce the test sample (liquid, solid, or gas) into a high-temperature cracking furnace (usually controlled at around 1000 ℃), and under the protection of an inert gas (such as high-purity argon), the sulfur element in the sample is oxidized and converted into sulfur dioxide (SO ₂).
Fluorescence excitation: The generated SO ₂ gas enters the fluorescence chamber and, under specific wavelength ultraviolet light (usually 190-230nm) irradiation, the SO ₂ molecule absorbs energy and transitions to an excited state.
Fluorescence emission and detection: When excited state SO ₂ molecules return to the ground state, they release characteristic fluorescence (wavelength approximately 330-390nm). The fluorescence signal is received and converted into an electrical signal by a photomultiplier tube, and its intensity is proportional to the sulfur content in the sample.
Data processing: The electrical signal is amplified and processed through a microcurrent amplifier and computer system, and the sulfur content in the sample is automatically calculated based on the standard curve.
Operation steps:
Select the appropriate standard curve based on the properties of the sample (the software usually comes with a built-in standard curve, which needs to be re established if there are special requirements).
Accurately input the oil density to ensure consistency between the injection and extraction volumes.
Perform injection operation and repeat 2-3 times after the experiment to ensure data accuracy, with data error controlled within 10%.
The sample data system automatically averages and saves, which can be viewed in the bottom left corner box.