Regional Geochemical Centre

Sample Preparation

In support of the PW2400, we have a Claisse Fluxy fusion device. With this instrument we are able to melt geologic samples together with a lithium borate flux in platinum crucibles and quickly form glass disks which are ideal for x-ray analysis. Liquid samples and loose powders can be analyzed using special sampling attachments that come with the PW2400. This type of sampling is ideal for liquid sludge, sediments and powdered samples that cannot be altered during analysis. Another type of sample perfect for x-ray fluorescence spectroscopy is particulate matter on filter disks, such as might be obtained from atmospheric sampling or the filtering of suspensions in liquids.

The major elements are measured on fused glass beads. Beads are prepared by mixing 5 g lithium tetraborate, 300 mg lithium fluoride and 35 mg lithium bromide with 1 g sample and fusing the mixture in a platinum crucible using the Claisse Fluxy at a temperature of approximately 1050 °C. The melts are molded into 30 mm disks and analyzed.

The Claisse Fluxy


Trace elements are determined on pressed pellets. These are prepared by mixing 10 g sample with 1.5 g powdered Bakelite (a phenol-formaldehyde co-polymer) and pressing the mixture into a disk approximately 5 mm thick and 40 mm diameter using the Herzog press at 20 tonnes for 10 seconds. The pellets are heated to 180 °C for 15 min and cooled to produce a sample for analysis.

The Hydraulic Press:


The Rhino Jaw Crusher: