Abstract
A pressurized continuous flow system using electromagnetic induction heating technique has been developed for the determination of trace and minor element content in biological samples by microwave induced plasma-optical emission spectrometry (MIP-OES). The system allows the continuous solubilization of samples at an optimized temperature of 120 °C and pressure of 3.5 bar in 40 min. A system was used to perform off-line solubilization of slurried samples of biological tissues, non-fat milk powder and lichen (3% m/v). Recovery of trace and minor elements averaged 99.2 ± 0.1% was performed by MIP-OES using external calibration technique. The accuracy of the method was proved using certified reference materials from the National Research Council Canada (NRCC, Dogfish Liver, DOLT-2), National Institute of Standards and Technology (NIST, (Non-Fat Milk Powder, NIST 1549) and International Atomic Energy Agency (IAEA, Lichen, IAEA-336). Satisfied analytical results were also obtained in real sample analysis of milk powder, barley and cinnamon.
Highlights
Microwave induced plasma-optical emission spectrometry (MIP-OES) has been shown to be a promising technique for the determination of elements in view of its relatively low costs and easy usage.[1]
This paper describes the design and evaluation of pressurized continuous flow solubilization system method, of high heating efficiency, by employing electromagnetic heating technique
The use of pressurized flow solubilization system of various sample materials, as slurry samples, has been applied to the decomposition of elements from biological materials, hyphenated with the MIP-OES method, this technique was successfully applied to the determination of ng mL-1 levels of inorganic elements, in biological samples, with good accuracy and reproducibility
Summary
Microwave induced plasma-optical emission spectrometry (MIP-OES) has been shown to be a promising technique for the determination of elements in view of its relatively low costs and easy usage.[1] Some pre-treatment procedures, including sample digestion, pre-concentration, separation, etc., are necessary for the determination of elements in environmental samples. Sample preparation is usually achieved by “complete” digestion using either conventional wet- or dry-ashing techniques followed by the appropriate chemical treatments. These decomposition procedures are often time consuming, requiring large volumes of aggressive and expensive reagents, and are prone to systematic error resulting from contamination and volatilization and adsorption losses.[5] Many of the
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