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We investigate the hydrothermal stability of cross-linked liquid silicone rubber (LSR) in water at 100°C up to period of two years. Optical microscopy of cross-sections of the exposed samples reveal that only the outer 100μm of the surface layer is affected after two years. However, the surface chemistry of the material after prolonged exposure becomes significantly modified, as monitored by X-ray...
The economical use of modern analytical instrumentation requires an online-coupling of efficiently working flow-systems which automate both sampling and sample pretreatment. Whenever extraction and preconcentration procedures are necessary the application of chromatomembrane cells proved to be very worthwhile. On this occasion the analyte exchange takes place inside a block of biporous PTFE wherein...
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