WHAT IT IS
Wavelength range in AAS typically covers the 170-190 nm to 900 nm region of the electromagnetic spectrum, including both the ultraviolet (UV) and visible light ranges. Each element absorbs light at a specific wavelength unique to its atomic structure. The ability of an AAS instrument to operate within this broad wavelength range allows for the detection and quantification of numerous elements, from heavy metals like lead and mercury to essential minerals like calcium and magnesium.
HOW IT WORKS
Hollow Cathode Lamps (HCLs) – Each lamp emits light at the specific wavelength absorbed by the element being analyzed. The wavelength range of the instrument must match the emission lines of the selected lamp.
Monochromators – These components isolate the exact wavelength of interest from the light source, ensuring that only the specific wavelength absorbed by the target element reaches the detector.
Detector Sensitivity – Detectors in AAS instruments are designed to measure light intensity accurately across the UV-visible spectrum, covering the full wavelength range used in atomic absorption measurements.
Calibration and Optimization – The instrument is calibrated for the specific wavelength corresponding to the element being analyzed, ensuring accurate and reliable measurements within the designated range.
IMPACT ON PERFORMANCE
Elemental Versatility: A broad wavelength range allows the analysis of a wide variety of elements, enhancing the instrument’s versatility.
Measurement Sensitivity: Different elements absorb light at different wavelengths, with some wavelengths providing higher sensitivity for trace-level detection.
Accuracy and Precision: The correct selection of wavelength ensures that only the target element’s absorption is measured, reducing interference from other elements.
Analytical Flexibility: An extensive wavelength range supports the analysis of both high- and low-concentration samples across multiple industries, from environmental monitoring to food safety.