In the DPPH radical assay and antioxidant capacity assay by luminol chemiluminescence, the samples were tested and analyzed together with one analytical blank
and one reference compound as the QA/QC sample.
is a solution containing all reagents in the proportions used to prepare glass samples, processed in the same manner as a glass sample without the presence of the glass.
Underlying all measurements is the critical concept of the "analytical blank," which is the irreducible background level of each constituent of interest contributed by all materials present except for the specimen itself.
4.1.1 The Analytical Blank for Particle Analysis: Conventional SEM
The "analytical blank" for particle analysis by conventional SEM microanalysis is the spectrum of the specimen support substrate exposed to all stages of the specimen preparation procedure, including transfers in the laboratory environment, but without the specimen itself applied to the substrate.
Problems connected with the analytical blank
in plasma renin activity measurements by angiotensin-I radioimmunoassay.
Ascot's quality-assurance and quality-control program includes the use of analytical blanks
to monitor for cross contamination, certified reference material standards to assess analytical accuracy, and duplicate samples to quantify sampling precision.
This design prevents catalyst poisoning, which can cause inconsistent oxidation conditions, higher analytical blanks
and unreliable data.
We analyzed adequate sets of analytical blanks before sample analysis; these included system and solvent blanks as well as blanks for the sampling device, pipettes, and storage tubes.
The concentration values of phthalate esters shown in this table have been corrected for the presence of phthalates in analytical blanks. DEP was detected in samples in concentrations of tens of parts per billion, whereas the phthalate esters with the most common commercial uses, di-(2-ethylhexyl) phthalate (DEHP) and DBP, were detected in much higher concentrations.
Analytical blanks. Because of their common use as plasticizers and their ubiquitous dispersal in the environment, phthalate esters have been detected as impurities in solvents, water, glassware, and many items of clinical and analytical laboratory equipment (26,27).
Quality assurance and quality control programs include the use of analytical blanks
, standards, and duplicates in addition to the lab's own internal quality assurance program.