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Last update: 2010-02-01

XRF Analysis of Polymers

A great variety of Polymer samples ...
was analysed in 1992 using UniQuant®2 and comprised:

-  granules (loose and hot pressed)
-  synthetic yarn
-  a piece of carpet
-  odd shaped pieces of plastic

There has been no sample preparation, except for the hot pressed granules.
The results on loose granules are so close to those on hot pressed pellets that
analysing loose granules directly seems to be the preferred technique..

The total measuring time was 15 minutes per sample. In routine practice, the measuring
program may be tailored and the total measuring time would then be less than 10 minutes.

We here only show some results for 2 Polyester specimen, both of the same material..
One is measured as loose granules on a supporting film in vacuum, the other is
hot pressed to a tablet and measured without supporting film. The concentrations of
the elements Ti, P, Sb and Mn had been previously analysed by XRF based on a
conventional calibration line.

Polyester, results in ppm (mg/kg)

       By conventional             UniQuant2
         XRF analysis

     pressed   pressed   loose Estimated pellet pellet granules Max. Error
Ti         2950            3500       3500        200
P            43              58         48          5
Sb          290             300        250         30  
Mn           80              84         86          8



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