I am involve with sample preparation for trace residue analysis of toxicant wondering whether I need to add internal standard at extraction stage too?

Seyed Jamaleddin Shahtaheri @Seyed_Shahtaheri

11 November 2018 0 7K Report

However, in case of not getting appropriate external calibration curve at the analysis stage, we do need to add internal standard to delete possible systematic analytical instrument system errors.

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