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In analytical chemistry, the detection limit, lower limit of detection, also termed LOD for limit of detection or analytical sensitivity (not to be confused with statistical sensitivity), is the lowest quantity of a substance that can be distinguished from the absence of that substance (a blank value) with a stated confidence level (generally 99%).
Because of the complex inter-relationship between analytical method, sample concentration, limits of detection and method precision, the management of Analytical Quality Control is undertaken using a statistical approach to determine whether the results obtained lie within an acceptable statistical envelope.
Method Reporting Limits (MRL) are generally about ten times the MDL. There is a formula for computing the MRL based on the MDL for EPA compliance labs, but I don't recall exactly what it is. Reporting results near the MDL aren't a sticky issue just because of the LOQ, but also because the claimed uncertainty for a method begins to break down at ...
An assay (analysis) is never an isolated process, as it must be accompanied with pre- and post-analytic procedures. Both the communication order (the request to perform an assay plus related information) and the handling of the specimen itself (the collecting, documenting, transporting, and processing done before beginning the assay) are pre-analytic steps.
The government needs to borrow money to continue paying out what Congress has already approved, but the debt ceiling puts a limit on how much money the U.S. government can borrow to pay its bills.
The general expression Qualitative Analysis [...] refers to analyses in which substances are identified or classified on the basis of their chemical or physical properties, such as chemical reactivity, solubility, molecular weight, melting point, radioactivity properties (emission, absorption), mass spectra, nuclear half-life, etc. Quantitative Analysis refers to analyses in which the amount ...
The outage raises questions about the disclosure of mishaps by private space companies and whether conflicts of interest could mar the ability of NASA and regulators to weigh their significance at ...
The FDIC is an independent government agency charged with maintaining stability and public confidence in the U.S. financial system and providing insurance on consumer deposit accounts.