American Analytical Services, Inc. has a standard operating procedure (SOP) for all aspects of sample drop off, drying and preparation, digestion, instrument analysis, quality control assurance and computerized data reporting.
Beginning with the prearranged schedule for sample shipments, AAS will insure a representative will be present to receive samples, fill out and check accuracy of chain of custodies (CC), log in samples and document any special instructions. Soil and rock samples will be dried and/or preserved for analysis. Soil samples will be panned and dried for 24 hours. Water samples will be preserved and refrigerated at 4°C until time of analysis.
The office will produce worksheets reflecting the CC, which identifies the sample, sample matrix, analysis requested, turn around time, and any other pertinent information. The samples are now ready for the preparation phase in which they are placed into sample groups (SG) so that they may be easily tracked throughout the analytical process.
Samples are segregated according to type and analysis requested. Water samples are digested in a separate lab area from the soils and rock samples. Samples are digested with high quality reagents in acid washed glassware or Teflon, or single use digestion vessels. The digestion of samples will strictly adhere to the specific protocol of the sample group. Sample quality controls will consist of duplicates and spikes at a rate specified by the method and lab control spikes and reagent blanks.