摘要:

The decomposition and redox reactions of aqueous ozone have been reported in detail for more than fifty years. More recent experiments in our laboratory have shown that ozone becomes very stable in 8–15 M sodium hydroxide solutions. Half-lives on the order of 20–30 hours have been observed, which is in marked contrast to half-lives of considerably less than one second observed in the pH 12–13 range. The results provide kinetic evidence for the role of O−; and for the formation ofas an intermediate in the regeneration of ozone and concomitant formation of oxygen.

ISSN:0191-9512    

DOI:10.1080/01919518908552511

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

摘要:

Kinetics of the oxidation of [Fe(terpy)2]2+, where 2,2′,2′′ -terpyridine is abbreviated as terpy, by ozone have been studied in acidic aqueous solution by the stopped-flow method. The reactions in pure perchloric acid solutions with excess ozone did not obey a simple first-order rate equation, but became nearly first-order in [Fe(terpy)2]2+, if ∼ 1O−2M NaCl was added to the solutions. Moreover, the addition of NaCl accelerated the rate, which was independent of the pH and the concentration of Cl−added.

ISSN:0191-9512    

DOI:10.1080/01919518908552512

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

摘要:

A laboratory study was conducted on the ozonation of an aquatic fulvic acid extracted from a forest pond near Poitiers in France. The rate of molecular ozone consumption was fast during the first minutes, and ozonation led to a slight increase of the lower apparent molecular 'weight, an enhancement of carboxyl content, and aldehyde formation. By ozonation of a bromide-containing solution of fulvic acid, some brominated organics were formed, while ozonation without bromide led to a reduction of the organic halide formation potential of a fulvic acid, especially in the presence of bicarbonate ions. The increase of GAC-filtration efficiency following ozonation was found to be the result of a biodegradability enhancement of fulvic acid by ozone. Manganese oxidation by ozone was partially inhibited by fulvic acid, particularly in the absence of bicarbonate ions.

ISSN:0191-9512    

DOI:10.1080/01919518908552513

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

摘要:

The conditions for the removal of iron and manganese contained in slightly mineralized water, rich in humic substances, were determined in a case where an intermediate oxidation was provided in a conventional potabilization line comprising a coagulationflocculation stage with iron salts.

ISSN:0191-9512    

DOI:10.1080/01919518908552514

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

摘要:

A pragmatic, real time procedure to determine gas phase ozone concentration is presented. The procedure requires syringe extraction of an air-ozone sample via a Teflon septum followed by ozone measurement using the indigo method. The results are confirmed by comparison to the standard iodometric technique. The method has a number of potential applications, including as an alternative to continuous gas phase UV monitoring, if UV absorbing compounds other than ozone are present.

ISSN:0191-9512    

DOI:10.1080/01919518908552515

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

ISSN:0191-9512    

DOI:10.1080/01919518908552510

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor