elsicon concentration column是什么？ 在文献中看到了这样一段处理方式，没有看明白是怎么处理的，求解释？麻烦大家啦。 Incorporated into the injector was an Elsicon concentration column (ELSICO, Russia) with internal diameter 4 mm, length 5 mm, filled with Separon S18 sorbent (30 ~m) , for purification and concentration of the samples instead of a batching loop of fixed volume. The sample (50/zl) was introduced into the injector and washed three times with 50/zl of water at the load 3 position, after which analysis was initiated
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