固相微萃取FFA扩散取样光纤夹具 57584-U

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固相微萃取FFA扩散取样光纤夹具

A holder for SPME FFA capable of determining the time-weighted average (TWA) concentration of volatile organic compounds (VOCs) in air. Unlike conventional sampling with SPME in which the fiber is extended outside the needle, during TWAS passive sampling the fiber is retracted a known distance inside the needle. The sample collect VOCs by the mechanism of molecular diffusion and sorption onto the fiber.

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