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High level
material plastic recycling demands that plastic materials must be
sorted according to various types and free of harmful
substances. IoSys - Dr. Timur Seidel e.K. has taken part in solving
the problem. A Sliding spark spectrometer was developed for identifying
halogen-containing plastics and PVC. It will help to make further amounts
of waste polymers available for re-use.
With the newly
developed technique "sliding spark spectrometry", an interesting tool for
fast plastic identification now exists. It allows direct analysis of
handy, compact, non-conductive plastic parts from the application
field of household, engineering electronics and automotive waste plastics
and other materials. For sample preparation to remove dust and dirt or
paintings the sample surface can be easily cleaned by scratching with a
knife.
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The basic
principle of the method is the thermal vaporization of a small
amount of the plastic surface using a train of defined high-current
sliding sparks. The material components in the spark
plasma are vaporized, |
atomized and
activated to emit radiation.
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Halogen
detection is performed by
the characteristic emission of Chlorine and Bromine in
the optical spectra. The |
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intensities
of these spectral lines are compared with preset threshold values.
These element are detected if
the pre-set
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threshold
value for PVC, Chlorine and Bromine are exceeded. After calibration
with known halogen containing samples, the system enables
semi-quantitative in the sub-% concentration range.
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Identification of PVC is the result
if high intensity of Chlorine is measured. |
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