Research purpose: In recent years, a newly rising living organism sampling technique- microdialysis is show up. Its principle is substance can diffuse along concentration gradient and semi permeable membrane permit micro molecule compound to pass. The merits as follows: normal position sampling, real-time, on-line, non sample pretreatment and dynamic detection. But the price of on-line apparatus is high, if generalization this new analytical technique manufacture domestic equipment is imperative.
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