Frequent Questions

I work at a water analysis lab and have run into a question concerning Method 548 calibration. In EPA method 548(gc/ms) it mentions prepping cal stds in triplicate. While calibrating must 3 calibration curves be generated?

A person does not generate three separate calibration curves.  The method employs an esterification step that has to also be applied to the calibration standards (procedural calibration).  There’s uncertainty associated with the yield of the product from the esterification.  Thus, the intent behind preparing triplicate standards at each concentration level is to obtain an average & std. deviation for each

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