Hydroxyl radical-scavenging activity (%) = [1-(As1-As2)/As0)] x 100, where A s0 is the absorbance
of the control (distilled water instead of sample); As1 is the absorbance
of the test sample mixed with reaction solution, and As2 is the absorbance
of the sample alone (distilled water instead of hydroxyl radical generating system solution).
The effect of drop size was shown in Figure 3(b), and it was found that the absorbance
of Sb (III) increased with the increase of the drop size from 2.0 to 6.0 [micro]L.
Ruthenium dye adsorption in mesoporous titania films is characterized using optical techniques by measurement of dye absorbance
on Ti[O.sub.2] photoelectrodes and indirect nanoplasmonic sensing.
was increased with an increase in ethanol concentration up to 0.25% above which the peak height absorbance
was decreased as shown in Figure 3(d).
As shown in Figure 8, at the same concentration of carbon nanoparticles, the shapes of the gradation curves on different types of paper are different: the paper with the lowest absorbance
(paper A) allows to obtain the highest intensity of own photoluminescence of printed images (excluding photoluminescence of paper).
Prior to use in the assay, the ABTS radical cation was diluted with 50% methanol for an initial absorbance
of about 0.700 (+-0.02) at 745 nm, with temperature control set at 30 AdegC.
Escherichia coli absorbance
activity for Cr(IV) metal concentration showed good activity after 24 h of incubation at pH 4.
The formation constants of the resulting 1:1 ligand to metal ions complexes were obtained at various temperatures by absorbance
measurements of solutions in which varying concentrations of metal ions were added to fixed amounts (5.0x[10.sup.-5] M-1.0x[10.sup.-4] M) of ligand solution, at [[lambda].sub.max] of complexes.
where A is absorbance
, e is molar absorptivity, b is path length of sample, and c is concentration of sample.
measurements were made on the NIST Material Measurement Laboratory Cary transfer spectrophotometer that is traceable to the NIST high-accuracy spectrophotometer.
The ABTS radical stock solution was then diluted with ultrapure water to obtain an absorbance
of 0.70 [+ or -] 0.02 at 734 nm.