THE SCIENTIFIC DETERMINATION OF REPORTING LIMITS AND EXPERIMENTAL CONFIRMATION OF A CALCULATION MODEL USING LABORATORY QUALITY CONTROL DATA

摘要

The State of California, Department of Health Services Division of Drinking Water andrnEnvironmental Monitoring (DHS-DDWEM), has used Detection Limit for Reporting (DLR) tornestablish the lower reporting limit for regulatory reports. The DLR refers to the minimum levelrnat or above which any analytical finding of a contaminant in drinking water shall be reported tornthe State of California. DLR values are set by regulation.rnInitiated by DDWEM in February 1999, a technical review committee consisting of members ofrnDHS and the regulated community of laboratories was convened to establish a more scientificrnand reproducible basis for the establishment of DLRs. A Statewide study by laboratoriesrncertified for drinking water was conducted to refine the criteria and establish numerical values.rnConcentration ranges for the statewide study were established using a statistical model andrnlaboratory QC data together with EPA Performance Evaluation Study data. This paper willrndiscuss the outcome of the study and how the calculation model can be used to simplify therndetermination of detection, reporting, and quantitation limits.