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Atomic Absorption Spectroscopy: Lab

Atomic 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...

Atomic Absorption Spectroscopy: Overview

Atomic 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...

Atomic Emission Spectroscopy: Overview

Atomic 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...

Atomic Absorption Spectroscopy: Interference

Atomic Absorption Spectroscopy: Interference

Interference leads to systematic error in atomic absorption (AA) measurements by enhancing or diminishing the analytical signal or the background. These interferences can be grouped into three main categories: spectral interference, chemical interference, and physical interference.
Spectral interference occurs when signals from other elements or molecules overlap with the analyte signal, falsely elevating or masking the analyte's absorbance. This interference can be corrected using Zeeman,...

Atomic Emission Spectroscopy: Lab

Atomic 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...

Atomic Absorption Spectroscopy: Instrumentation

Atomic 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...

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Updated: Jun 28, 2026

Preparation of Food Samples Using Homogenization and Microwave-Assisted Wet Acid Digestion for Multi-Element Determination with ICP-MS

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Simultaneous multielement atomic-absorption analysis of biological materials.

N J Miller-Ihli¹

¹U.S.D.A., Nutrient Composition Laboratory, Beltsville, MD 20705, U.S.A.

|January 1, 1990

Summary

A new atomic-absorption spectrometer (SIMAAC) can accurately determine multiple elements in biological samples using either flame or graphite furnace atomization. This versatile instrument offers precise results across different analytical conditions.

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Area of Science:

Analytical Chemistry
Spectroscopy
Environmental Science

Background:

Accurate elemental analysis of biological materials is crucial for health and environmental monitoring.
Existing atomic-absorption spectrometry methods can be time-consuming or limited in scope.

Purpose of the Study:

To develop and evaluate a prototype multielement atomic-absorption spectrometer (SIMAAC) for analyzing biological samples.
To assess the performance of SIMAAC using both flame and graphite furnace atomization techniques.

Main Methods:

Utilized a continuum source and a modified echelle polychromator with wavelength modulation.
Performed elemental analysis on diverse biological materials.
Employed both flame atomization and graphite furnace atomization for sample analysis.

Main Results:

The SIMAAC prototype successfully determined multiple elements in various biological matrices.
Analytical accuracy and precision were maintained even under compromise atomization conditions.
Comparative results from different atomization methods were consistent.

Conclusions:

The developed SIMAAC is a viable tool for multielement analysis in biological samples.
The spectrometer demonstrates flexibility and reliability across different atomization techniques.
Compromise conditions do not hinder the overall analytical performance, making it suitable for diverse applications.