Determination of inorganic compounds in polyolefines
Sprache des Vortragstitels:
16 th Austrian Chemistry Days
Sprache des Tagungstitel:
High strength polymers are usually resistant to higher temperature and to many
solvents. For trace metal determinations dissolved samples are necessary and such
sample requires a rigorous sample preparation step. In many cases this includes a
microwave digestion procedure [1, 2]. Many analytical methods are available for the
determination of trace metals, including atom absorption spectroscopy (AAS), optical
emission spectroscopy (OES) and inductively coupled plasma mass spectrometry (ICPMS).
ICP-MS methods for trace metal determination achieve low detection limits and
fast analysis times .
In this work typical elements like aluminum, titanium and magnesia from different
catalyst systems (e.g. Ziegler-Natta-catalyst or metallocenes) which were used for
preparing polyolefines including homopolymers and copolymers were determined with
ICP-MS and previous microwave digestion.
Different acids and their mixtures e.g. nitric acid, hydrofluoric acid, phosphoric acid
and sulfuric acid were used for sample dissolution. High-pressure (100 bar) closedvessels
were used for the microwave digestion and temperatures from 200 to 270 °C. It
was found that stirring during the microwave digestion was very important. The
resulting digests were analyzed by ICP-MS. Detection limits for those elements were
lower than 1 ppb.