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compounds have been used for many years in foods, pharmaceuticals, health and beauty products,
adhesives, sealants and many other commercial products. Silicones can appear in the environment in a
number of forms, as polar silanols, as nonpolar poly(dimethylsiloxane ) (PDMS) polymers or volatile
cyclic compounds such as octamethylcyclotetrasiloxane. It follows, that a simple and effective method
for determining silicon compounds in environmental samples (e.g. surface water) is required and Dorn
and Frame assembled an apparatus specifically for this purpose the details of which are shown in Figure
10.8.
Figure 10.8
The LC/ICP-AAS Tandem Combination Used
for The Determination of Silicones in Water (ref. 23)
As the silicon compounds had high molecular weights, the authors employed size exclusion
chromatography as the separation technique. The chromatograph was the Hewlett-Packard Model
1090M fitted with an auto sampler. The spectrometer was a Jobin-Yvon sequential JY Model 24S
which was equipped with dual monochromators. A standard Scott double-
