Matrix Spike/Matrix Spike Duplicate Sample Clauses

Matrix Spike/Matrix Spike Duplicate. An MS/ MSD is an aliquot of sample spiked with known concentrations of the target analytes of interest . The spiking occurs prior to sample preparation and analysis. Ea ch analyte in the MS and MSD shall be spiked at a level less than or equal to the midpoint of the calibration curve for each analyte. Only project samples shall be used for spiking. The MS/ MSD samples should be selected by the sampler and should be annotated on the chain-of-custody form. The MS/ MSD samples are used to document potential matrix effects in associated samples collected at a site. The prime contractor must select the samples for MS/ MSDs. The sample replicates will be generated in the field and will be used by the laboratory to prepare the appropriate MS/ MSDs. Only one soil sample container may be necessary for the parent sample, the MS sample, and the MSD sample (except for VOCs). The MS/ MSD results and flags must be associated or related to sa mples that are collected from the same site from which the MS/ MSD set were collected. A site -specific MS/ MSD is normally specified for each media (e.g., a different soil, water, or sediment) at each site during each sampling event. Project managers should designate the MS/ MSD and determine whether they are site -specific based on the project requirements. The standard collection frequency is one MS and one MSD for each site and included for every 20 field samples (i.e., collect up to 20 field samples followe d by two additional samples designated as MS and MSD). The frequency may be modified based on project-specific DQOs or the quantity of historical data available for a site. The performance of the MS and MSD is evaluated against the quality control acceptance limits shown in the Appendix B tables. If either the MS or the MSD is outside the quality control acceptance limits, the data shall be evaluated to determine whether there is a matrix effect or analytical error , and the analytes in the related samples s hall be qualified according to the data flagging criteria in Section 5.0. The laboratory should communicate potential matrix difficulties to the prime contractor so an evaluation can be made with respect to the DQOs.
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