Proton nuclear magnetic resonance spectroscopy has been used t o determine trace amounts of polydimethylsiloxane (PDMS) in plastics additives, dyes and pigments. A n efficient Soxhlet extraction procedure using pentane is proposed. Accurate, quantitative results were achieved w i t h samples containing siloxanes at the big g-1 level. The quantification limit was found t o be 0.1 big g-1 of PDMS. This is the level at which acceptable recoveries were found.
Fourier transform infrared (FT-IR) spectrometry has been used to determine trace amounts of polydimethylsiloxane in a plastics additive. The efficiency of the proposed extraction method and the utility of the developed FT-IR method were used to determine siloxanes at the vg g-1 level in plastics additives. Various evaluation possibilities of the recorded spectra were compared both in the presence and absence of interfering absorption bands arising from simultaneously extracted components. The method was applied successfully to the determination of siloxanes in a number of other additives.
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