Laserfiche WebLink
1 <br /> Ql'ruanterra <br />' Environmental <br /> Services <br /> Quanterra Environmental Services- Western Region <br />' Quality Control Definitions <br />' C Parameter Definition <br /> A set of up to 20 field samples plus associated laboratory QC <br /> QC Batch samples that are sunilar in composition (matrix) and that are <br /> processed within the same tune period with the same reagent <br />' and standard lots <br /> Consist of a pair of LCSs analyzed withui the same QC batch <br /> Duplicate Control Sample to monitor precision and accuracy independent of sample <br /> (DCS) matrix effects This QC is performed only if required by client <br /> or when insufficient sample is available toperform.MS/MSD <br /> A second aliquot of an environmental sample, taken from the <br />' same sample container when possible, that is processed <br /> independently with the first sample aliquot The results are <br /> Duplicate Sample (DU) used to assess the effect of the sample matrix on the precision <br />' of the analytical process The precision estimated using this <br /> sample is not necessarily representative of the precision for <br /> other samples in the batch <br />' A volume of reagent water for aqueous samples or a <br /> contairunant-free solid matrix (Ottawa sand) for soil and <br /> Laboratory Control Sample sediment samples which is spiked with known amounts of <br />' (LCS) representative target analytes and required surrogates An <br /> LCS is carred through the entire analytical process and is <br /> used to monitor the accuracy of the analytical process <br /> inde endent of lawential matrix effects <br /> A field sample fortified %%ith known quantities of target <br /> analyzes that are also added to the LCS Matrix spike <br />' Matrix Spike and Matrix Spike duplicate is a second matrix spike sample MSs/MSDs are <br /> Duplicate (MS/MSD) carried through the entire analytical process and are used to <br /> determine sample matrix effect on accuracy of the <br />' measurement system The accuracy and precision estimated <br /> using MS/MSD is only representative of the precision of the <br /> sample that was spiked <br />' A sample composed of all the reagents (in the same quantities) <br /> in reagent water tamed through the entire analytical process <br /> Method Blank (MB) The method blank is used to monitor the level of <br />' contamination introduced during sample re aration-ste s <br /> Organic constituents not expected to be detected in <br /> environmental media and are added to every sample and QC at <br />' Surrogate Spike a known concentration Surrogates are used to determine the <br /> efficiency of the sample preparation and the analytical <br /> process <br />' Source Quanterra® Quality Control Program, Policy QA-003,Rev 0, $119196 <br /> 1 <br /> 1 <br />