ORGANIC MATERIALS

Method

X-ray fluorescence (XRF) spectrometry

XRF spectrometry has for many years been accepted internationally as a rapid and accurate technique for the analysis of organic substances.
The determination of total element concentrations of between 0.1 ppm and 100% in biological samples is carried out with a minimum of pre-treatment.

Sample preparation

Samples received for XRF trace-element analysis are dried at 60° C and finely ground in a tungsten carbide ring mill. Boric acid backed discs of 10-15 g of ground material are prepared under high pressure and analysed under vacuum.

Elements analysed

Programs are currently available for the determination of fifteen elements in organic materials on a routine basis, and a further 24 non-routinely. To view a layout of these elements, click here.

Quality assurance

Calibration of the spectrometer for the measurement of organic materials is carried out using international reference standards of appropriate compositional range for each element of interest in accordance with the requirements of International Accreditation New Zealand - ISO 17025.