Reaction Of ClO2 Research Articles

Dynamics Studies of the Chemiluminescent Reactions of ClO<SUB>2</SUB> with Ca(<sup>1</sup><I>S</I>,<sup>3</sup><I>P</I>) and Ba((<sup>1</sup><I>S</I>,<sup>3</sup><I>D</I>)

The chemiluminescent reactions of clo2 with ca, ba atoms have been studied under single collision conditon in a beam-gas apparatus. the metastable states of the metal atoms are generated by the use of low voltage dc discharge. the chemiluminescence spectra have been observed ad the spatial distributions of the intensities of the chemiluminescent emissions have been also measured by oma-ii. the total reaction cross sections of metal atoms measured are 97 angstrom(2), 138 angstrom(2) for ca(s-1), ca(p-3)a nd 138 angstrom(2), 230 angstrom(2) for ba(s-1), ba(d-3) respectively. the intensities of the chemiluminescence spectra are increased significantly when the metal atoms are excited to their metastable states. in particular, the increase of bao(a') is much more than that of bacl (c) in the reactio of ba(d-3) + clo2. in addition, non-boltzmann vibrational distributions were found in the electronic excited state a' (1)pi of the products mo in both reacations by computer simulation. the chemiluminescent cross sections of the transition c-2 pi -> x-2 sigma(+) of the products mcl are 51 angstrom(2) for ba(d-3) +clo2, 31 angstrom(2) for ca(p-3) + clo2 respectively. the branching ratios of the products mo and mcl were calculated based ont he chemiluminescent spectra. a discussin about the mechanisms of these reactions is presented.

ChemInform Abstract: Investigations on Solid Dichlorinehexaoxide: First Crystal Structure Determination of a Chlorine Oxide.

AbstractCl2O6 has been prepared by reaction of ClO2 with O2/O3 mixtures (∼ 2 Vol.% O3).

Kinetics and mechanism of the OH + CIO2reaction

AbstractThe rate constant k1 for the reaction of OH radicals with CIO2 molecules was measured in a discharge flow system over the temperature range 293 ≤ T ≤ 473 K and at low pressures, 0.5 ≤ P ≤ 1.4 torr, using electron paramagnetic resonance or laser‐induced fluorescence to monitor the pseudo first‐order decay of OH concentrations. At 293 K, the value obtained for k1 was (7.2 ± 0.5) × 10−12 cm3 molecule−1 s−1. Within the temperature range of this study, a negative temperature dependence was observed: k1 = (4.50 ± 0.75) × 10−13 exp[(804 ± 114)/T] cm3 molecule−1 s−1. HOCl was detected by mass spectrometry as a product of the reaction and was titrated using OH + Cl2 as a source in the calibration experiments. A simulation of the mechanism of the OH + ClO2 reaction indicated that HOCl was mainly produced in the first reaction step. Both this result and the observed T dependence of k1 suggest that this reaction proceeds via an intermediate adduct with a cyclic geometry.

Mechanism of Chloroform Formation by Chlorine and Its Inhibition by Chlorine Dioxide

Mechanism of Chloroform Formation by Chlorine and Its Inhibition by Chlorine Dioxide. SUH, D. H., and ABDEL-RAHMAN, M. S. (1985). Fundam. Appl. Toxicol. 5, 305–313. Chlorination of drinking waters leads to the formation of trihalomethanes arising from the reaction of chlorine and organic substances. Therefore, chlorine dioxide (ClO2) which does not produce trihalomethanes is being considered as an alternative disinfectant. It has been reported that rat blood chloroform levels were significantly decreased after treatment with ClO2. Studies were conducted to investigate the mechanisms of chloroform formation by chlorine (HOCl) and its inhibition by ClO2 (5 mg/liter) in the presence of HOCl (5, 10, 20 mg/liter) using sodium citrate (1 mM) as an organic substance. When citrate was reacted with HOCl, β-ketoglutaric acid, monochloroacetone, dichloroacetone, and trichloroacetone were produced as reaction intermediates and chloroform as a final product. There was a linear relationship between the concentrations of HOCl and the formation of chloroform. When ClO2 was substituted for HOCl, neither chloroform was formed nor citrate concentration was changed. Further, chloroform formation was inhibited by ClO2 in the presence of HOCl and citrate and the degree of inhibition depends on the ratio of ClO27sol;HOCl. Gas chromatograph/mass spectrometer analysis indicates that this inhibition is related to the reaction of ClO2 with β-ketoglutaric acid to form malonic acid. Chlorine dioxide also oxidizes other intermediates such as monochloroacetone and dichloroacetone to acetic acid. These studies indicate that ClO2 inhibits chloroform formation from citrate and HOCl by the oxidation of the intermediates which were involved in the reaction of chloroform formation.