Standard procedure for metal methods is to run a minimum of 3 calibration standards (making sure to bracket the expected sample concentration). Then run the calibration blank and a single mid-level calibration standard immediately following each calibration routine, after every ten analyses and at the end of the sample run.
EPA Method 200.8-How many calibration solutions and which one(s) should be run after the calibration routine, every ten analyses, and at the end of the sample run for checking instrument performance?
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