Área de trabajo: Análisis de Alimentos y Bebidas, Análisis de Materiales, Medio Ambiente.
Título: Preparación de Muestras para AA e ICP con asistencia de Digestores de Microondas.
Título original: Sample Preparation for ICP and AA.
Autor: Suhas Narkhede, Ph. D. Questron Technologies, Canada.
Ideal Sample Preparation method
Sample preparation for ICP and AA involves converting analyte form so that it is soluble in solvent of interest. This is often achieved by opening up tough chemical bonds in sample by attack of acids and heat. This acid attack results in formation of soluble salts of analyte. Ultimate goal is to convert sample in state presentable to instrument of interest.
Ideal method should be such that,
Brings 100% of sample in solution
Does not allow any analyte to leave the solution
Does not introduces any impurities
Does not brings in any interferences for analysis
Uses acids which are suitable for instrument employed in analysis
Uses acids which are convenient to use
It not very lengthy and can result in high throughput
Fact of life is such method does not exist!
l Digestion possible at higher temp than boiling points of acids
l Requires relatively less volumes of Acids
l Use of troublesome acids can be avoided
l Able to trap volatile elements
l Results in very good recoveries
l Environment friendly
l Large quantity of sample can not be handled
l Pre-digestion or pre-treatment is often required
l Relatively expensive
l Can not handle large no of samples
l Care is required to avoid cross contamination
l Safety measures are required to deal with large pressures
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