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General Reporting Notes – Data Qualifiers <br /> <br /> <br />EU116_v8 (General Reporting Notes-Data Qualifiers) Enthalpy Analytical, LLC – Wilmington, NC <br />The following are general reporting notes that are applicable to all Enthalpy Analytical, LLC - <br />Wilmington, NC data reports, unless specifically noted otherwise. <br />General Data Qualifiers <br /> Ac - Alternate calculation flag indicates the es recovery was calculated using the opening concal <br />when either of the following situations is encountered in the data processing software: the ES <br />recovery is over 400% or the JS is not detected. <br /> B – The analyte was found in the method blank, at a concentration that was at least 10% of the <br />amount in the sample. <br /> Cxx – Two or more congeners co-elute. In EDDs, C denotes the lowest IUPAC congener in a co- <br />elution group and additional co-eluters for the group (‘xx’) are shown with the number of the <br />lowest IUPAC co-eluter. <br /> E – The reported concentration exceeds the calibration range (upper point of the calibration <br />curve). For HRMS data, this condition does not imply additional measurement uncertainty. For <br />LC-MS/MS data, these values should be considered as having measurement uncertainty higher <br />than values within the calibration range. <br /> EDL – Estimated Detection Level: The EDL is unique to isotope dilution methods and reflects <br />the conditions of analysis at the time of analysis, including the equipment used. Where the MDL <br />is a static value, the EDL is a dynamic value. <br /> EMPC – Estimated Maximum Possible Concentration: EMPC is specific to Dioxin/Furan tests to <br />indicate the determined ion-abundance ratio was outside the allowed theoretical range (usually <br />due to being near the detection limit, although it can very rarely be caused by a co-eluting <br />interference). The EMPC concentration is adjusted to reflect the value at the theoretical ion- <br />abundance ratio. <br /> I/IR – The ion ratio between the primary and secondary ions was observed to be outside the <br />method criteria. The analyte concentration may be inaccurate due to interference. <br /> J – The analyte has a concentration below the minimum calibration level (LOQ value) but greater <br />than the LOD. These values should be considered as having measurement uncertainty higher than <br />values within the calibration range <br /> L - For reports containing PFAS analytes only, this flag indicates that an analyte has a <br />concentration below the Minimum Detection Limit (MDL) . The reported concentration is not <br />recommended for regulatory use as the analyte signal may have a signal-to-noise ratio less than <br />the criteria deemed necessary to be considered a detected analyte. <br /> LOD – Limit of Detection: For reports conforming to the DOD ELAP QSM, this is the QSM- <br />defined LOD. For reports conforming to TNI requirements (but not DOD ELAP QSM <br />requirements), this value is the minimum detection limit (MDL). The LOD is adjusted for sample <br />weight or volume. <br />EU 0824-1274 Page 5 of 20 78 of 95