Faqs

MDLs are the starting point within a laboratory of defining normal Reporting Limits (RLs), also called Practical Quantitation Limits (PQLs). An MDL is a value that is statistically determined and [...]

Method Detection Limits (MDLs) are the minimum concentrations of substances that can be measured with 99% confidence that the analyte concentrations are greater than zero. MDL studies are [...]

Surrogates are used in most organic analysis to demonstrate matrix compatibility with the chosen method of analysis. Each sample is spiked with a known concentration of surrogate compound(s) [...]

A surrogate is an organic compound similar to the analytes of interest in both chemical composition and behavior in the analytical process, but not normally found in environmental samples.

A Matrix Spike and Spike Duplicate (MS/MSD) are representative but randomly chosen client samples that have known concentrations of analytes of interest added to the samples prior to sample [...]

Laboratory Control Samples and Sample Duplicates (LCS/LCSD) are samples prepared in the laboratory that contain analytes that are representative of the analytes of interest in client submitted [...]

A method blank (MB) is an analyte-free matrix such as DI Water for liquids or cleaned sand for solids and/or soils that is processed in exactly the same manner as the samples. The main function [...]

There are several levels of Quality Control (QC) packages available. A standard or Level II QC package includes results QC samples associated with your specific samples: Method Blank, a [...]

Tools include Standard Operating Procedure documents for each method performed, maintenance logs for instrument performance, a wide variety of bench sheets, log books and forms used to track all [...]

Torrent’s primary Quality Control tool involves control charts that set acceptance criteria for each method performed at the laboratory. Some limits are mandated by specific methods but most are [...]