Dual channel atomic fluorescence spectrometer (AFS) is a highly sensitive analytical instrument used for detecting elements such as mercury, arsenic, selenium, antimony, etc. It is widely used in the detection of environmental, food, pharmaceutical, and geological samples due to its simple operation, low detection limit, and strong ability to resist matrix interference. However, in practical use, many users may experience deviation in results or even equipment damage due to insufficient understanding of the instrument principles or improper operation. Here are some common usage misconceptions and avoidance suggestions.
Firstly, neglecting the purity of reagents and the stability of reducing agents is a typical mistake.Dual channel atomic fluorescence spectrometerHigh quality requirements are placed on reducing agents such as KBH ₄. If the reagent contains impurities or is improperly prepared, it can lead to incomplete reactions, unstable signals, and even blockage of the flow path. High purity reagents should be selected and strictly proportioned according to the instructions. They should be prepared as needed to avoid prolonged exposure to air.
Secondly, the unreasonable setting of the carrier gas flow rate affects the measurement results. The carrier gas (usually argon) serves as a protective atmosphere and carries atomic vapor during the atomization process. Excessive flow will dilute atomic vapor and reduce sensitivity; If it is too low, it may cause atomic loss or flame instability. The gas pressure and flow rate should be adjusted reasonably according to the instrument model and the type of element to be tested, to ensure the best detection state.
Thirdly, improper sample preparation can lead to errors. Atomic fluorescence analysis has strict requirements for sample pretreatment, especially for complex matrix samples such as soil, biological tissues, etc. If the digestion is incomplete or interference ions (such as Cu ² ⁺, Fe ³ ⁺) are introduced, it will significantly inhibit the generation of hydrides, thereby affecting the recovery rate. It is recommended to use standard digestion methods and add masking agents if necessary to eliminate interference.
In addition, neglecting the daily maintenance and cleaning of instruments is also a common problem. After prolonged use, the reaction tank, gas pipeline, and atomizer are prone to blockage by residues, resulting in signal fluctuations or inability to inject samples normally. After each experiment, the pipeline system should be cleaned in a timely manner, and the pump tubes and filtration devices should be replaced regularly to ensure that the system is unobstructed.
Moreover, effective quality control and calibration verification have not been carried out. Some users only rely on factory curves for quantitative analysis, ignoring the impact of drift, contamination, or changes in reagent batches. It is recommended to run blank and standard solutions for baseline calibration before each test, and regularly use certified standard substances for quality control to ensure accurate and reliable data.
In conclusion,Dual channel atomic fluorescence spectrometerThe efficient and stable operation cannot be achieved without scientific operation and standardized management. Only by avoiding the common misconceptions mentioned above can its performance advantages be fully utilized to provide accurate and reliable detection guarantees for trace element analysis.