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Analysis in medicine
In the context of clinical tests, hair or finger nails but also bones and tissue are occasionally tested for heavy metals. Since the quantity of such samples is usually quite small, the concentration after a wet-chemical digestion is often too low to obtain reliable results. With solid AA® these types of examinations can be greatly simplified. A small sample quantity, usually 0.1 - 0.5 mg, can be analyzed directly. The prior digestion and the associated dilution become unnecessary, which means that the detection sensitivity with regard to the original sample is increased significantly.
Petrochemical analysis
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Crude oil and the fractions contained therein are often difficult to mineralize, since they contain both very reactive and very stable components. The sample quantity that can be used is small, because a high pressure is generated during the digestion. Accordingly, the determination of element traces often requires a high analytical effort. Good examples are the elements nickel and vanadium, that act as a catalyst poison and increase the corrosion of unit parts and usually need to be determined in the lower mg/kg range. With solid AA® crude oil and similar samples can be analyzed directly without any additional preparation. Additionally, the direct solid analysis has the advantage that volatile organic compounds, such as nickel and vanadylporphyrin, remain in their original form. Therefore, selectively volatile and thermally stable element compounds can be determined with the solid AAS, a process that cannot be carried out after a mineralization. |
 Signal intensity for nickel and vanadium
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Application examples
| Tissue, liver, kidney |
Cd, Pb |
| Hair, finger nails |
Hg, As, Se, Pb, Cd, Si |
| Blood (on filter paper) |
Pb |
| Crude oil |
Ni, V, Cd, Pb, Cr |
| Catalysts | Fe, Cu, Pd, Pt, Rh, Pb, Co, Na |