Elemental analysis plays a crucial role in the vast fields of scientific research and industrial production. From precise detection of heavy metal pollutants in environmental monitoring, to strict screening of various harmful elements in the field of food safety, and to in-depth exploration of trace elements in the human body in life sciences, the accuracy and efficiency of element analysis are crucial.
1、 The working principle of atomic fluorescent lamps
The working principle of atomic fluorescent lamps is based on the physical process of gaseous atoms releasing characteristic fluorescence after being excited. This process can be roughly divided into the following key steps:
1. Atomization: The element to be tested in the sample is first converted into a gaseous ground state free atom through flame atomization or flameless atomization.
2. Fluorescence excitation: A specific wavelength light source, such as a hollow cathode lamp, emits light towards the atomized sample. After absorbing energy from the light source, gaseous atoms transition from the ground state to the excited state. Taking mercury elemental analysis as an example, a mercury hollow cathode lamp emits light of a specific wavelength, which is absorbed by mercury atoms and induces them to enter an excited state.
3. Fluorescence emission: Atoms in an excited state are not stable and quickly return to the ground state. During this process, atoms release energy in the form of light radiation, producing characteristic fluorescence. There are various types of fluorescence, among which resonance fluorescence is more commonly used. Its fluorescence wavelength is the same as the excitation light, with a high transition probability, and can be excited by ordinary light sources. In addition, there are non resonant fluorescence types such as direct jump line fluorescence, step jump line fluorescence, and anti Stokes fluorescence, which are suitable for the analysis of specific elements.
4. Detection and quantification: The emitted fluorescent signal is captured by a photodetector and converted into an electrical signal. By measuring the linear relationship between fluorescence intensity and element concentration (following Lambert Beer's law), quantitative analysis of the tested element can be achieved. In practical operation, the instrument amplifies and converts the detected electrical signals into analog-to-digital signals, ultimately presenting accurate elemental content data.
2、 Design of Beijing Puxi Atomic Fluorescence Lamp
In the research and development of atomic fluorescent lamps, Puxi has created a series of distinctive products with years of accumulated rich experience and continuous innovation spirit.
1. Intelligent high-intensity hollow cathode lamp: PuXi's atomic fluorescent lamp adopts built-in chip technology, and the chip program is independently developed and written by the company. This innovative design endows the lamp with many advantages. Firstly, it can automatically recognize element lights, making it convenient for users to quickly and accurately select the required analysis light source. Secondly, the lamp records the optimal usage conditions of corresponding elements, such as key parameters such as lamp current and negative high voltage, providing important references for users, especially when facing unfamiliar sample measurement conditions, which can greatly help users optimize experimental plans. In addition, the lamp can automatically accumulate and record the usage time in the measurement state. This function is of great significance for users to judge the service life of the lamp, maintain and replace it in a timely manner, and effectively avoid affecting the accuracy of experimental results due to the expiration of the lamp life.
2. Plug and play element lamp technology: The universal atomic fluorescence lamp realizes plug and play function, and the process of changing the lamp does not require manual adjustment. This design ensures the consistency of the lamp position, effectively reducing detection errors caused by deviations in lamp installation position, and making the detection results more reliable. Whether in daily frequent experimental operations or in scientific research projects that require high experimental accuracy, this convenient and precise design has brought great convenience to users.
3. Innovative optical system design: The Puxi atomic fluorescent lamp adopts advanced non dispersive short focal length optical path technology in the optical system, effectively simplifying the structure, shortening the optical path, and significantly enhancing the fluorescence signal intensity. Compared with traditional dispersive instruments, non dispersive instruments, although lacking monochromators, can still achieve efficient elemental analysis through clever structural design. At the same time, Puxi also introduced a dual beam single detector optical system, which can effectively deduct the drift and fluctuation of the excitation light source, especially showing excellent stability in mercury testing, greatly improving the accuracy and reliability of measurement results.
3、 Performance advantages
1. Ultra high sensitivity: Beijing Puxi atomic fluorescence lamp shows excellent sensitivity, with detection limits for key elements such as mercury and arsenic reaching extremely low levels. This ultra-high sensitivity enables it to detect extremely trace elements in the sample, meeting the stringent requirements of ultra trace element analysis. In the field of environmental monitoring, the ability to accurately detect trace heavy metal pollutants in soil, water quality, and air provides strong data support for environmental protection work.
2. Good stability: With the advanced dual beam optical structure and stable light source system, the Pu Xi atomic fluorescence lamp can maintain excellent stability during long-term operation. The baseline drift is extremely small. After preheating for 30 minutes, the baseline drift within 30 minutes is ≤ 1%, effectively ensuring the consistency and reliability of the detection results. Whether conducting continuous analysis of a large number of samples or conducting experiments under different environmental conditions, the instrument can operate stably, providing users with reliable detection data.
3. Wide dynamic range: Its dynamic range covers 3-5 orders of magnitude and can adapt to sample analysis at different concentration levels. From detecting trace elements at extremely low concentrations to analyzing samples at relatively high concentrations, universal atomic fluorescence lamps can accurately provide results without the need for complex dilution or concentration of samples, greatly improving analysis efficiency and reducing experimental costs.
4、 Widely applicable fields
1. Environmental monitoring: In the field of environmental monitoring, Beijing Puxi atomic fluorescent lamps play an irreplaceable role. It can accurately detect heavy metal pollutants such as arsenic, mercury, lead, etc. in soil, water quality, and air. By accurately analyzing these pollutants, environmental protection departments can timely understand the environmental quality status, formulate scientific and reasonable environmental policies, take effective pollution control measures, and protect the ecological environment and public health.
2. Food safety: Food safety is related to the national economy and people's livelihood, and Pu Xi atomic fluorescent lamps have also shown great potential in this field. It can be used to screen for heavy metal elements such as selenium, lead, cadmium, etc. in various foods such as grains, aquatic products, and vegetables. By strictly detecting harmful elements in food, food safety can be effectively ensured, preventing foods with excessive heavy metals from entering the market and safeguarding consumers' dietary safety.
3. Industrial quality control: It is crucial to strictly control the heavy metal content in products during industrial production processes such as metallurgy and chemical engineering. Universal atomic fluorescence lamps can accurately analyze heavy metal elements in industrial products, help enterprises achieve quality monitoring of the production process, ensure product quality meets standards, improve resource utilization efficiency, reduce environmental pollution, and promote sustainable industrial development.
4. Life Sciences: In life science research, understanding the content and distribution of trace elements in the human body is of great significance for disease diagnosis, health assessment, etc. Universal atomic fluorescence lamps can be used to detect trace elements in biological samples such as blood, urine, and tissues, providing key data support for clinical diagnosis and medical research, and helping the development of human health.
Beijing Puxi atomic fluorescent lamps have advanced working principles, design, performance advantages, and a wide range of application fields. It not only provides powerful analytical tools for researchers and promotes the in-depth development of scientific research, but also provides reliable technical support for quality control and safety assurance in various industries, making important contributions to the progress and development of society. With the continuous advancement of technology, we believe that Beijing Puxi Atomic Fluorescence Lamp will continue to innovate and play a more important role in the field of elemental analysis in the future, unlocking new heights in elemental analysis.