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Chemistry Laboratory

Atomic Absorption Spectroscopy (AAS) helps characterize various metals in all kinds of materials and solutions. Analyzing about 30 chemical elements is possible using this method. AAS is used for determining the concentration of chemical elements like Au, Ag, Al, Mn, Sn, Zn, Cu … The accuracy of this method is in the range of ppm (part per million).

AAS is based on processing the absorption of optical radiation (usually UV-VIS) by electrically neutral atoms in the gaseous state. For the purpose of analyzing atomic absorption using AAS equipment, a flame atomizer vaporizes the chemical element to be analyzed (dissolved in an inorganic acid), and subsequently the element dissociates into atoms. For each desired element, a special Hallow cathode lamp (radiation line source) is used to provide a suitable radiation, which will then be absorbed by the element's atoms.


Chemistry Laboratory News

Installation and Setup of ICP Equipment

Recently, Optima 8000 ICP-OES equipment has been installed and set up at RMRC chemistry laboratory and is currently operative.

Inductively Coupled Plasma Optical Emission Spectrometry (ICP-OES) is one of the most important instrumental methods for the analysis of chemical elements both qualitatively and quantitatively. This method can be used for determining the concentration of 70 chemical elements in various samples including soil, water, metals, ceramics, and organic materials. Due to the high repeatability and compatibility of ICP-OES, results are precise and accurate.

This method is based on the excitation of electrons of various elements in plasma atmosphere (as an excitation source) and the analysis of subsequent light emission of their ions. In this method a flow of Ar is ionized by a MHZ 40-20 magnetic field and produces a heat amount of close to 1000K. The sample is then sprayed into the Ar plasma and transforms to ions and subsequently radiates. The intensity of radiation is then measured by the equipment.

The range of application for ICP-OES
Applications in Geology: determining the concentration of chemical elements in soil, stones and sediments after dissolution by accelerators or in acids.

Applications in Biology: determining the concentration of trace metallic elements in water, soil, and sediments after dissolution and pre-concentration.

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