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Gas chromatograph mass spectrometer system has a pre-filter mass analyzer and an electron multiplier to provide excellent sensitivity. Desorption for solids is carried out with <br>a flow rate of 1 to 1.5 ml/min at a regulated temperature between 100 and 350u2103. The analysis is sensitive and focused, with a seven-stage temperature programming and an interface <br>temperature of 450u2103.
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