Aarhus Universitets segl

Elemental analysis

CHNOS analyser

The Elementar Vario MACRO Cube is capable of measuring the Carbon, Hydrogen, Nitrogen, Oxygen and Sulfur content of a given sample with 200 ppm precision, regardless of whether the sample is a liquid or a solid. Prior to analysis the sample is packed into a tin or silver foil which makes the sample preparation simple and fast. In the CHNOS analyzer the sample is combusted at 1150 °C and the resulting gasses are separated according to their respective elemental content.

As a consequence of the quick sample preparation and the short analysis time of the Elementar Vario MACRO Cube, the time it takes to prepare and analyze the sample is approximately 15-20 minutes. Data handling is simple and the data can easily be exported to Microsoft Access or Excel.

X-Ray Fluorescence (XRF) spectroscopy

To meet routine demands within the field of elemental analysis, CMC has access to a brand new Spectro Xepos X-ray spectrometer featuring 8 secondary targets, vacuum mode and powerful quantification software. The spectrometer offers concentration determination down to the ppm-level of elements ranging from Sodium to Uranium with minimal needs for sample preparation.

This spectrometer is often used as a non-destructive technique which is particularly useful when the available sample supply is limited.

Induced Coupled Plasma Optical Emission (ICP-OES) spectroscopy

To handle demanding elemental analysis, CMC has the use of a brand new Spectro Arcos ICP-OES spectrometer. The instrument has a radial plasma view, giving it detection limits in the general range 0.01 - 50 ppb depending on the particular element in question, the injection system used (nebulizer, spray chamber) and the overall sample composition.

Each spectrum is recorded simultaneously (i.e. non-sequentially), which allows a high throughput even for broad screenings of elemental composition. Unlike most ICP-OES spectrometers this instrument is also capable of detecting the element chlorine, making fluorine the only element which falls outside the detection range. Also, the omni-presence in the plasma of Hydrogen, Carbon, Oxygen, Nitrogen and Argon invariably makes analyses of these particular elements inconclusive. Apart from these few exceptions, this ICP-OES system allows the quantification of all elements

Sample preparation (digestion) is accomplished by means of an Anton Paar Multiwave 3000 microwave oven equipped with an 8-vessel rotor which permit monitoring of overall pressure as well as individual vessel temperatures. With usual vessels this instrument allows digestion under hydrothermal conditions up to 260 °C and 60 bar. This makes it possible to treat even the most demanding samples such as oxides or degradation-resistant metal alloys.