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Quality Control Procedures Services
Calibration of instrumentation is done daily before analysis is carried out and then checked with control standards. Analytical working standards are those made from approved stock standards traceable to the National Bureau of Standards (NIST) and purchased from a reputable vendor. A logbook will be kept detailing the preparation of these standards. A notebook is kept of the working standards including date made, concentration, preparation volumes, and analyst. Daily standards are those made up from working standards each day due to low concentrations of the analyte or decomposition problems. All working standards are stored in airtight bottles.Samples are digested, extracted, or treated with reagent washed glassware. Metals glassware shall be soaked in a dilute acid bath and rinsed with de-ionized water and kept for the specific analysis of metals. Samples will be treated with quality reagents and shall follow protocol of contractual requirements.
The (ICV) (standard with accepted analyte value), and control blank (ICB) (accepted blank value of analyte) will be charted in the instrument log books. The (ICV) will be within ±10% of the true value. The (ICB) will be maintained below the instrument detection limit. During the analysis, ongoing checks of control samples will be generally performed at a frequency of one CCV/CCB per ten samples. The control verification must meet the requirements stated above. Quality control procedures also include sample duplicates and spikes at a rate of one per twenty samples. Logbooks will reflect daily operations of instrumentation and analytical procedures. QC customized to meet a client’s specific can also be provided.
Data reporting will take place once all requests for analysis are complete and the integrity of the QA/QC is met. The reports are generated from the instrument computer whenever possible, and transferred to excel spreadsheets. Analysis not performed on an instrument is detailed in log books and lab bench sheets for inclusion in the excel spreadsheets. Once the data is entered on the computer, it can be faxed, mailed, or e-mailed to the client depending on their preference.