Injection internal standard. An analyte which is not present in the sample extract and is added to it just before injection as well as to each calibration standard. It can be used to correct for variability in injection. It should be chosen not to be susceptible to degradation or matrix-induced effects. Examples of I-ISTD for gc are PCB209, PCB101. 这里的内标是专门用来校正进样的么？
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