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TOC QA/QC terms
TOC info
| Term | Definition |
|---|---|
| Analysis Batch | A set of samples prepared and analyzed on the same instrument during a 24-hr period. This includes Cal samples, blanks, and regular samples. It is limited to 20 field samples, not including QC samples. |
| Calibration blank | is a volume of LRW treated with same reagents used in prep of calibration standards. It is a "zero standard" and is used to calibrate TOC analyzer. |
| Calibration blank | Is made at the same time as the calibration standards and stored along with and under the same conditions as the calibration standards. |
| Calibration blank | is used to monitor increases in organic background found in the calibration standards over time by analyzing it as a sample and comparing the results with initial analysis of it. |
| Field Reagent Blank | optional. A volume equivalent to that which is collected at a sample site, of LRW is placed in a sample bottle then transferred into a different bottle and analyzed. Think transport blank |
| Laboratory reagent blank | A volume of LRW that's prepared with each sample set, and treated as a TOC sample, including expsure to glassware, plasticware, equipment and reagents. Used to determine if organic contamination or other interferences are present in lab environment. |
| Field Duplicates | Gives measure of the precision associated with sample collection, preservation, storage, analysis and lab procedure. |
| Laboratory Fortified Matrix | an aliquot of a field sample to which a known quntity of KHP is added. The LFM is subjected to same prep and analysis as a sample and its purpose is to determine whether sample matrix affects accuracy of TOC results. |
| Laboratory Fortified Matrix | The background concentration of organic carbon in the sample matrix must be determined in a separate aliquot and the measured value in the LFM corrected for background concentration. |
| Laboratory Reagent Water | may be distilled or deionized or HPLC reagent grade or equivalent water which is low in TOC and less than 0.35 ppm TOC and less than 0.01 UVA. |
| Laboratory fortified matrix duplicate | If an analyte is rarely detected in a matrix, do this: use a second portion of sample to which a known amount of analyte of interest is added before sample prep. |
| Quality Control Sample | Solution containing known conc. of TOC, which is analyzed exactly like a sample. It's obtained from a source external to lab and is different from source used for preparing Cal stds. |
Created by:
maw247
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