duplicate sample

duplicate sample

[¦düp·lə·kət ′sam·pəl]
(analytical chemistry)
A second sample randomly selected from a material being analyzed in order to evaluate sample variance.
References in periodicals archive ?
Where D 1 is analyte concentration in the first duplicate sample and D 2 is the concentration of the analyte in the second duplicate sample [11].
The optimal system for reducing inappropriate TS orders would be able to perform the following functions: (1) alert providers to the presence of a duplicate sample, (2) alert providers regarding impending TS expiration, (3) ensure the presence of a second sample for type verification for patients who have not had previous blood bank testing, and (4) allow for specimen tracking from the patient to the laboratory to avoid unnecessary redraws or samples directed to the wrong laboratory.
For one of the samples, one duplicate sample and one field blank sample were collected.
Identical culture conditions are used to prepare a duplicate sample for fluorescence-activated cell sorting (FACS) testing.
A duplicate sample would have individual berry weights recorded prior to delivery to California State University, Fresno (CSU Fresno), for tannin analysis.
Some of the features of the cyclone assembly are: a hydraulic upper knife valve and pneumatic lower knife valve for collecting and isolating the sample; a hydraulic hinge between the dump box and cone splitter that allows for easy cleaning; and a fixed cone splitter with primary and duplicate sample chutes.
We analyzed samples in batches of 12, with each batch consisting of 8 samples, 1 method blank, 1 duplicate sample pair (i.e., two 200-mg portions of fine dust taken from the same vacuum cleaner), and 1 interbatch quality control sample (i.e., a 200-mg portion of fine dust taken from the quality-control vacuum cleaner).
A duplicate sample was also collected at RCC to determine variability of concentrations between samples.
It will test and confirm a reference sample to ensure that all sample preparation steps are within established limits; test and confirm a duplicate sample to prove that the results can be repeated within established limits; and, if applicable, check a blank sample to test for equipment contamination," says Lischefski.
Core samples from the Klaza property were processed in 36 sample batches with each batch including two assay standards, two blank samples, and one duplicate sample. Analytical work is being done by ALS Chemex with sample preparation in Whitehorse and assays and geochemical analyses in North Vancouver.
DAFF investigations are ongoing and results of analysis of a duplicate sample are awaited.