Atomic absorption spectrophotometer: a breakthrough in the core technology of elemental analysis

The importance of atomic absorption spectrophotometer

Atomic absorption spectrophotometer (AAS) is a core instrument in the field of elemental analysis, and its importance is reflected in three dimensions:

Accurate detection: Through atomic absorption spectroscopy technology, metal and semi metal elements can be detected at the ppm to ppb level, with sensitivity far exceeding traditional chemical analysis methods.

Widely applicable: covering eight major fields such as environmental monitoring, food safety, and pharmaceutical research and development, becoming the "gold standard" for laboratory quality control.

Technological iteration: From early single element analysis to modern multi-element combination, it promotes breakthrough development in fields such as materials science and environmental governance.

Technical principle: Precise dialogue between light and atoms

The instrument is based on atomic absorption spectroscopy, and the core process is as follows:

Light source excitation: Hollow cathode lamp emits characteristic sharp line spectra of the tested element (such as copper 589nm).

Atomization process: Flame or graphite furnace atomizes the sample to form ground state atomic vapor.

Optical signal capture: The monochromator filters characteristic spectral lines, and the photomultiplier tube converts light intensity into electrical signals.

Quantitative analysis: According to Lambert Beer's law (A=kc), calculate the concentration of elements through a standard curve.

Technical advantage: redefining analysis accuracy

Taking Shandong Hengmei HM-AAS3 as an example, the core innovations include:

Total reflection achromatic optical system

Replacing traditional convex lenses with concave mirrors eliminates focal chromatic aberration of different elements and improves light efficiency by 30%.

C-T type monochromator

The 1800 line/mm grating combined with a dazzling wavelength of 230nm design achieves a spectral resolution of 0.2nm and significantly enhances anti-interference ability.

Eight Element Lighthouse Technology

One lamp operation+seven lamp preheating mode, reducing lamp replacement time to 1 minute and increasing analysis efficiency by 50%.

Intelligent background correction

Deuterium lamp and self absorption dual-mode calibration, with a background signal of 1A and a background deduction ability of 50 times, ensure the accuracy of low concentration detection.

Industry pain points and innovative solutions

Pain point 1: Time consumption for pre-processing complex samples

Solution: Introduce hydride generator combined technology to achieve online enrichment of elements such as arsenic and selenium, reducing pretreatment time by 70%.

Pain Point 2: Simultaneous Analysis of Requirements with Multiple Elements

Solution: Develop a graphite furnace flame combination module that supports synchronous detection of 8 elements, reducing the cost of single sample analysis by 40%.

Pain point 3: High complexity of instrument maintenance

Solution: Intelligent fault diagnosis system (such as combustion head blockage warning) reduces downtime and maintenance costs by 35%.

Application case: Practical testing of heavy metals in soil

Project background: Investigation of soil lead and cadmium pollution in an industrial park

Technical solution:

The sample was processed using microwave digestion method, and the recovery rate was>95%.

The flame method was used to determine lead (detection limit 0.008 μ g/mL), and the graphite furnace method was used to detect cadmium (characteristic quantity 0.5pg). Result: Complete single sample full element analysis within 10 minutes, and the data meets the requirements of HJ 166-2020 standard.

Atomic absorption spectrophotometer is evolving from a "laboratory tool" to an "intelligent analysis platform". Shandong Hengmei will continue to drive industry transformation through technological innovation, helping global users achieve more efficient and accurate element analysis.