For organic analysis, an initial five-point calibration is performed with five standard concentration levels. This curve is subjected to linearity requirements specific to the method, which dictates the actual quantitation method to be used. On each successive day of analysis, a single midpoint standard is analyzed to verify the continued linearity and accuracy of the initial calibration curve. If these method-specific criteria are not met, then a new initial calibration curve is generated prior to the analysis of the environmental sample.
For inorganic and metals analysis, daily three point calibrations are performed according to the method being used.
AETL routinely uses methods that are listed in:
Code of Federal Regulations (40CRF Part 136) Methods for Chemical Analysis of Water and Wastes (EPA-600/4 – 79-020) Test Methods for Evaluating Solid Waste Physical/Chemical Methods (SW846) Standard Methods for the Examination of Water and Wastewater
Other methods of analysis are also used by AETL as needed.