TAILIEUCHUNG - TECHNIQUES FOR THE ANALYSIS OF ORGANIC CHEMECALS BY INDUCTIVELY COUPLED PLASMA MASS SPECTROMETRY (ICP-MS)

To help ensure accurate measurements, Region 9 recommends that these guidelines be followed whenever VOCs in soil or other solid matrices are sampled and analyzed. These guidelines address methods for: (1) handling of samples as intact soil cores; (2) preserving samples; (3) storing samples in hermetically sealed containers; and (4) minimizing analyte losses due to direct volatilization (both in the field and the laboratory) and biodegradation. Region 9 believes that following these guidelines is a scientifically important part of ensuring that accurate concentrations of VOCs are measured. Therefore, the procedures by which data are generated for or. | Techniques for the Analysis of Organic Chemicals by Inductively Coupled Plasma Mass Spectrometry ICP-MS Petrochemical Authors Ed McCurdy Don Potter Agilent Technologies Ltd. Lakeside Cheadle Royal Business Park Manchester SK8 3GR UK Abstract Inductively Coupled Plasma Mass Spectrometry ICP-MS is used for the routine monitoring of trace and ultra-trace metal contaminants in aqueous-based chemicals. Recent advances in ICP-MS technology and methodology have extended the analytical capability of the technique to the determination of similarly low levels of metal contamination in organic solvents and other complex matrices. The new instrument hardware overcomes previous limitations in ICP-MS sample introduction systems while advances in applications development enable complete removal of carbon-based spectral interferences from organic sample matrices using the Agilent cool plasma technique. Using the new ICP-MS methodology virtually any organic material can be analyzed either directly or after simple dilution with a suitable solvent without the need for matrix removal or digestion. New developments include the use of organic solvent resistant materials in the sample introduction path and precise control of sample delivery and solvent volatility to avoid system overloading. Optimization of plasma parameters allows the carbon matrix to be decomposed completely and gives complete removal of carbon-based as well as argon-based interferences allowing the routine analysis of key elements like Mg K Ca Cr and Fe at levels previously only possible with Graphite Furnace Atomic Absorption Spectroscopy GFAAS . Introduction ICP-MS is widely used for the determination of metals in aqueous sample matrices because of its multielement capability excellent sensitivity flexibility and reliability as a routine analytical tool. However the analysis of organic samples is more challenging because of difficulties in sample introduction and the spectral interferences that arise from the .

• Hoá dầu
• Withholding Law
• Holding Period
• Vein Stenosis
• Recurrent Pancreatic Cancer
• Pancreatic Neuroendocrine Tumors
• Management Paradigm