Method blank definition

Method blank means an analyte-free matrix to which all reagents are added in the same volumes or proportions as are used in sample preparation.

Method blank means an analyte free matrix to which all reagents are added in the same volumes or proportions as used in the sample preparation and is processed in exactly the same manner as the samples.

Method blank means a sample of a matrix devoid of or having a consistent concentration or amount of the analytes of interest processed simultaneously with and under the same condi- tions, preparatory and analyses steps as the associated samples.

Examples of Method blank in a sentence

• Method blank values that are below the associated LLOQ will also be qualified with a J flag and a <QL qualifier to indicate they are estimated values detected below the QL.

• The water remained in MC for few (2-3) minutes after which its DTT activity was measured by the analytical system.5 Method blank (particle-free) was determined by connecting a HEPA filter upstream of MC and running it for one hour.

• Method blank analyses are used to assess acceptance of sample results.

• The following items should be included when using USEPA Methods:  Initial calibration; Daily calibration/continuing calibration; Laboratory control spike; Internal standards; Surrogates; Method blank; and Field blank.

• Method blank levels are considered acceptable if they are consistent with SW-846.

• Method blank samples will be analyzed to ensure that no sources of contamination are present.

• Method blank analytical results are assessed to determine the existence and magnitude of contamination problems associated with sample extraction (if applicable) and analysis.

• Method blank levels should be below these levels (quantitation limits) for all analytes.

• Method blank sample results will establish a baseline response and indicate the presence of contamination in glassware and equipment, and cross contamination from samples containing high concentrations of target parameters or interfering substances.

• Laboratory blank—See Method blank Laboratory control sample —See Ongoing precision and recovery (OPR) standard Matrix spike (MS)—A sample prepared by adding a known quantity of organisms to a specified amount of sample matrix for which an independent estimate of target analyte concentration is available.

More Definitions of Method blank

Method blank means a clean matrix that is treated and processed exactly as a sample including exposure to all glassware, equipment, solvents, reagents, internal standards, and surrogates to measure artifacts in the measurement process.

Method blank means a sample of reagent grade water which is processed through all preparation steps and the analytical

Method blank means a sample of a matrix devoid of or having a consis- tent concentration or amount of the analytes of interest processed simultane- ously with and under the same conditions, preparatory and analyses steps as the associated samples.

Method blank means an aliquot of reagent water or clean sample matrix that is treated and processed exactly as a sample including exposure to all glassware, equipment, solvents, reagents, internal standards, and surrogates to measure a rtifacts in the measurement process.

Method blank means a clean matrix containing only the internal standard. The method blank is used to assess background interference or contamination that exists in the analytical system that might lead to the reporting of elevated concentration levels or false positive data. Results from tests of the method blank should be below the limit of quantitation.

Method blank means a sample of a matrix devoid of or having a consistent concentration or amount of the analytes of interest processed simultaneously with and under the same conditions, preparatory and analyses