Chemical Sample Collection Information - Query Results
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EPA's SAM lists the analytical methods that have been selected by multi-agency technical work groups for use by laboratories that are tasked with sample analysis following a contamination incident. The method tiers listed reflect the extent of method validation and indicate the level of method usability for the specific analyte and sample type. These tiers are defined in the Chemical Methods Query on the Selected Analytical Methods for Environmental Remediation and Recovery website: https://www.epa.gov/esam/selected-analytical-methods-environmental-remediation-and-recovery-sam-2022
In some cases, analytes are listed as not a concern in a particular sample type; in these cases, SAM work groups have determined that the analyte is not a concern due to a number of factors, including the analyte's low likelihood of persistence, toxicity, mobility or solubility within the particular sample type.
Sample sizes are based on the minimum amount needed for analysis of a single sample. Additional sample amounts may be requested or needed for laboratory quality control analyses (e.g., duplicates, matrix spikes) or for measurement of low analyte concentrations. It is also recommended that additional sample(s) be collected in case of the need for reanalysis due to sample spillage or unforeseen analytical difficulties. Where possible, sample sizes are based on specifications included in the selected analytical methods.