sodium-perchlorate and potassium-bromide

The major peak near 498 nm in the ultraviolet-visible spectrum of congo red in aqueous solution shifts toward the blue while the molar absorptivity of this peak decreases predictably with increasing ionic strength. The shift was observed for solutions in which ionic strength was varied from 0.0 to 1.8M using the uni-univalent ionic compounds, NaCl, NaClO(4), KNO(3) and KBr separately. A plot of the log of the absorbance at the peak versus ionic strength was linear as well as a plot of the log of the wavelength of the major peak (shifted from 498 nm) versus the ionic strength. The slopes of each of these plots were somewhat different depending on the ionic compound.

Topics: Bromides; Coloring Agents; Congo Red; Nitrates; Osmolar Concentration; Perchlorates; Potassium Compounds; Sodium Chloride; Sodium Compounds; Solutions; Spectrophotometry, Ultraviolet; Water

The parallel course of the excretion rates of bromide and sodium ions was demonstrated in adult male and female rats administered simultaneously with potassium 82Br-bromide and 24Na-sodium chloride. The animals were exposed to various intakes of sodium ions accompanied with five different anions: Br-, Cl-, HCO3-, ClO4-, and SCN-. Regardless of the anion accompanying the sodium ion, the excretion rates of 82Br- and 24Na+ ions were proportional to the magnitude of sodium intake in the animals. Hence, we have proved our hypothesis that the biological half-life of bromide depends on the magnitude of sodium intake rather than on the intake of chloride.

Topics: Animals; Bromides; Bromine Radioisotopes; Female; Half-Life; Male; Perchlorates; Potassium Compounds; Rats; Rats, Wistar; Sodium; Sodium Bicarbonate; Sodium Chloride; Sodium Compounds; Sodium Radioisotopes