A calculated value, the level at which a particular piece of analytical instrument can detect the presence of a specific compound above the background noise of the instrument detector. For dioxin/furan analysis, this value is determined by the signal to noise ratio which must be a minimum of 2.5.
minimum concentration of a contaminant that can be determined.
The minimum concentration of a substance that can be identified, measured, and reported within 99 percent confidence that the analyte concentration is greater than zero; determined from analysis of a sample in a given matrix containing the analyte.
The lowest quantity of a hazardous substance that can be distinguished from the normal random "noise" of an analytical instrument or method. For HRS purposes, DL is the method detection limit (MDL) or, for real - time field instruments, the instrument detection limit (IDL) as used in the field.
The smallest quantity that can be accurately measured by an analytical method.
Analytical capability based on the amount of the sample and the sensitivity of the analytical method.
The smallest concentration or amount of a component of interest that can be detected by a single measurement with a stated level of confidence.Generally regarded as the concentration level with a precision of Â±100%.
the concentration at which the mean value of the output sensor signal is equal to two standard deviations. In practice, the lowest concentration of the analyte that can be detected and/or measured by a sensor. In other words, the concentration (or activity) of the measured ion at the point of intersection between the extrapolated linear segment of the calibration curve (representing the normal slope of the electrode) and a horizontal line (representing the voltage when the concentration is so low, that small changes in concentration do not produce any detectable change in the electrode response). The portion of the calibration curve between this point and the beginning of the truly linear section is known as the non-linear range of the electrode. Samples are still measurable within this range provided that several standards are used to define the changing slope of the curve accurately, but the error in concentration (per millivolt error in measurement) will be progressively greater as the slope reduces.
Refers to the least amount of the target substance that could be detected by the instrument or analytical process that was used to determine the result. Above this value, the target substance is presumed to be present.
the minimum detectable concentration of analyte that can be confidently measured. Defined as 3x the standard deviation of repeated measurements on a blank sample.
The minimum concentration, which can be detected under ideal analytical conditions.
The smallest concentration or amount of a substance that can be reported as present with a specified degree of certainty by a definite, complete analytical procedure.
The largest anomaly that could be missed (not the smallest anomaly that could be found) by an in-line inspection tool.
The lowest amount of substance that can be distinguished from the noise of an analytical instrument or method for a "clean" sample of a particular matrix.
The minimum concentrations that can be accurately and precisely measured by the laboratory and/or specified in a quality assurance plan.
the lowest amount that can be distinguished from the normal "noise" of an analytical instrument or methods. [Source: Risk Assessment Guidance for Superfund: Volume I -- Human Health Evaluation Manual ( Part A). Interim Final. U.S. Environmental Protection Agency. Office of Emergency and Remedial Response. EPA/540/1-89/002, Definitions for Chapter 5
the lowest level that can be determined by a specific analytical procedure or test method.
The minimum concentration of an analyte (substance) that can be measured and reported with a 99% confidence that the analyte concentration is greater than zero as determined by the procedure set forth in 40 CFR Part 136, Appendix B.
The smallest amount of substance that a laboratory test can reliably measure in a sample of air, water, soil or other medium.
A minimum concentration that must be accurately and precisely measured by the laboratory and/or specified in the quality assurance plan.
The lowest concentration of a drug which can reliably be detected in a specimen.
The detection limit of an individual analytical procedure is the lowest amount of analyte in a sample that can be detected, but not necessarily quantitated as an exact value.
the minimum amount of an analyte that can be detected reliably. This is most often defined as three times the standard deviation of the blank measurement.
the lowest concentration of a given pollutant that an analytical method or equipment can detect and still report as greater than zero.
The lowest concentration of a chemical that can reliably be distinguished from a zero concentration.
A number, expressed in units of concentration (or amount), that describes the lowest concentration level (or amount) that an analyst can determine to be different from an analytical blank (background level).
In analytical chemistry, the detection limit, or LOD (limit of detection), is the lowest quantity of a substance that can be distinguished from the absence of that substance (a blank value) within a stated confidence limit (generally 1%). There are a number of different "detection limits" that are commonly used. These include the instrument detection limit (IDL), the lower level of detection(LLD), the method detection limit (MDL) and the level of quantitation (LOQ).