Atomic Absorption Spectroscopy

Rayleigh WFX 210

The Rayleigh WFX 210 has a patented flame analysis technique which adopts an oxygen-rich air-acetylene flame which allows higher temperature elemental analyses compared to the nitrous oxide-acetylene flame. This AAS uses a graphite furnace with pneumatic control and pressure lock to ensure constant pressure and reliable contact.

Principle

Atomic absorption spectroscopy (AAS) is a technique which provides a quantitative analysis of metals in liquid samples by their absorption in the light. Elemental metals absorb optical light at their unique wavelengths when excited by heat. The AAS focuses a beam of optical light which is characteristic of the analyte element, through a specific wavelength through a flame into a detector. The sample is aspirated to the flame which atomises the analytes which then in turn absorb the light, causing a decrease in the intensity of the light. This change in intensity is recorded by the detector which converts the change into intensity.

Strengths

• Requires a small sample size
• Very good detection limits with few spectral interferences
• Fitted with an autosampler

Limitations

• Slow analysis time
• Chemical interferences and element limitations present

Applications

• Quanititative analysis of elements present in a variety of sample types

Technical Specifications

• The wavelength range is between 190 nm to 900 nm with an accuracy of ±0.25 nm
• Flame AAS is used to determine concentrations of elements in the parts per million (ppm) range at 2300 °C-3000 °C