Related Experiment Video
Updated: Aug 16, 2026
07:38
Characterization of Biological Absorption Spectra Spanning the Visible to the Short-Wave Infrared
Published on: January 10, 2025
Analytical characteristics of a continuum-source tungsten coil atomic absorption spectrometer
Jennifer A Rust1, Joaquim A Nóbrega, Clifton P Calloway
1Department of Chemistry, Wake Forest University, Winston-Salem, NC 27109, USA.
Summary
A new tungsten coil electrothermal atomic absorption spectrometer enables simultaneous multi-element analysis. This versatile instrument shows promise for diverse applications, including gas phase temperature measurement and interference studies.
Area of Science:
- Analytical Chemistry
- Spectroscopy
- Atomic Absorption Spectroscopy
Background:
- Electrothermal atomic absorption spectrometry (ETAAS) is a powerful analytical technique.
- Simultaneous multi-element analysis can improve efficiency and reduce sample requirements.
- Developing versatile instrumentation is crucial for broad analytical applications.
Purpose of the Study:
- To assemble and evaluate a continuum-source tungsten coil electrothermal atomic absorption spectrometer.
- To demonstrate the instrument's utility through diverse applications.
- To explore methods for enhancing sensitivity and understanding interferences.
Main Methods:
- Construction of a spectrometer utilizing a xenon arc lamp, tungsten coil atomizer, Czerny-Turner monochromator, and photodiode array detector.
- Simultaneous multi-element analysis across a 4 nm spectral window with 0.024 nm resolution.
- Application of the instrument for gas phase temperature measurement, summation analysis of aluminum lines, background subtraction in oil emulsion analysis, and lead-sodium interference studies.
Main Results:
- The instrument successfully performed simultaneous multi-element analyses.
- Gas phase temperature during atomization was measured using tin.
- A summation approach for aluminum absorption lines improved sensitivity.
- A background subtraction technique was applied to oil emulsion analysis.
- Lead atomization interference by sodium was investigated, suggesting competition for H2.
Conclusions:
- The developed continuum-source tungsten coil ETAAS is a versatile instrument for simultaneous multi-element analysis.
- The demonstrated applications highlight its potential in various analytical fields.
- Further investigation into interference mechanisms can refine analytical methodologies.
Related Concept Videos
01:13Atomic Absorption Spectroscopy: Radiation and Light Sources
Atomic absorption spectroscopy (AAS) relies on the Beer-Lambert law, which requires that the radiation source emits a narrow range of wavelengths to match the absorption characteristics of the analyte atom. The primary criteria for choosing an appropriate radiation source in AAS is to provide a precise and intense emission at specific wavelengths that will allow accurate detection of the analyte.
Two common narrow-range 'line' sources used in AAS are hollow-cathode lamps (HCLs) and...
Two common narrow-range 'line' sources used in AAS are hollow-cathode lamps (HCLs) and...
01:22Atomic Absorption Spectroscopy: Instrumentation
An atomic absorption spectrophotometer (AAS) comprises several components: a radiation source, an atomizer, a monochromator, and a detector. The radiation source can be a hollow-cathode lamp (HCL) or an electrodeless-discharge lamp (EDL), both of which provide a narrow emission line of the required wavelength. However, some instruments use continuum sources and high-resolution monochromators to achieve a narrow range of radiation.
The atomizer used in AAS can be either a flame atomizer or an...
The atomizer used in AAS can be either a flame atomizer or an...
01:27Atomic Absorption Spectroscopy: Overview
Atomic absorption spectroscopy (AAS) is a technique used to analyze elements by measuring electromagnetic radiation (EMR) absorbed by atoms, which causes them to transition to a higher-energy orbit. The most crucial step in AAS is atomization, where the analyte is converted into gas-phase atoms, typically through a flame or furnace. Some of these atoms become thermally excited in the flame, while most remain in the ground state.
When irradiated by EMR of a particular wavelength, these...
When irradiated by EMR of a particular wavelength, these...
01:21Atomic Absorption Spectroscopy: Lab
For AAS measurements, samples must be introduced as clear solutions, often requiring extensive preliminary treatment to dissolve materials like soils, animal tissues, and minerals. Common methods for sample preparation include treatment with hot mineral acids, wet ashing, combustion in closed containers, high-temperature ashing, or fusion with reagents.
Solutions containing organic solvents, such as low-molecular-mass alcohols, esters, or ketones, enhance absorbances by increasing nebulizer...
Solutions containing organic solvents, such as low-molecular-mass alcohols, esters, or ketones, enhance absorbances by increasing nebulizer...
01:20Atomic Emission Spectroscopy: Overview
Atomic emission spectroscopy (AES) is an analytical technique used to determine the elemental composition of a sample by analyzing the light emitted from excited atoms. In AES, atoms in a sample are excited to higher energy levels by thermal energy from high-temperature sources, such as plasma, arcs, or sparks. When these excited atoms return to lower energy states, they emit light at specific wavelengths characteristic of each element. The resulting atomic emission spectrum, which consists of...
01:29Atomic Emission Spectroscopy: Lab
AES is a powerful analytical technique, especially effective when used with plasma sources, producing abundant spectra in characteristic emission lines. The Inductively Coupled Plasma (ICP), in particular, yields superior quantitative analytical data due to its high stability, low noise, low background, and minimal interferences under optimal experimental conditions. However, newer air-operated microwave sources are emerging as promising alternatives that could be more cost-effective than...