We have a limited supply of samples previously analysed in our proficiency testing challenges. These samples can be used to assess the accuracy of your own calibrators or control material. The samples are available for purchase. For spiked samples, we supply details of the nominal concentrations, together with the descriptive statistics for each method published by the proficiency testing scheme on our website. Subject to availability, you can choose any sample circulated in the past 12 months.The samples are not supplied as certified reference materials.
The costs are, per 1mL:
To this cost must be added packaging and and surface/Air Mail postage at the following rates:
Rest of the World US$32.00 or GBP22.00
Courier shipment is available on request at a cost of:
Rest of the World US$140.00 or GBP100.00