[en] Absorption spectra are reported for Cd EDTA3-, Cd CDTA3-. Pb EDTA3- and Pb CDTA3- formed by the reaction of e-sub(aq) with Cd EDTA2-, Cd CDTA2-, Pb EDTA2- and Pb CDTA2-. Estimates are given for the stability constants of CD EDTA3- and Cd CDTA3-. The extinction coefficient at 320 nm for Cd EDTA3- is epsilon320 = (9.7+-0.9) x 103 dm3 mol-1 cm-1. The rate constants for the reactions of e-sub(aq) with Cd CDTA2- and Pb CDTA2are 1 x 103 dm3 mol-1 s-1and 1.9 x 109 dm3 mol-1 s-1. The rate constants for the reactions of H2O2 with Cd EDTA3- and Pb EDTA3- are 2 x 109 dm3 mol-1 s-1 and 2.5 x 109 dm3 mol-1 s-1. Some experimental data are reported concerning the disappearance of Cd EDTA3- in the presence of several alcohols. For the reaction Cd EDTA3- + Pb EDTA2- a rate constant of 4 x 106 dm3 mol-1 s-1 was determined. This value was compared with a value estimated by means of the Marcus theory. (orig.)
[de]
Dia Absorptionsspektren von Cd-EDTA3-, Cd-EDTA3- Pb-EDTA3- und Pb-CDTA3-, die sich durch die Reaktion hydratisierter Elektronen mit Cd-EDTA2-, Cd-CDTA2, Pb-EDTA2- und Pb-CDTA2- gebildet haben, werden beschrieben. Die Stabilitaetskonstanten fuer Cd-EDTA3- und Cd-CDTA3- werden abgeschaetzt. Der Extinktionskoeffizient epsilon betraegt bei 320 nm fuer Cd-EDTA3- (9,7 +- 0,9) x 103 dm3 mol-1 cm-1. Die Geschwindigkeitskonstanten der Reaktionen des e-sub(eq) mit Cd-CDTA2- und Pb-CDTA2- betragen 1 x 108 dm3 mol-1 s-1 und 1,9 x 109 dm3 mol-1 s-1. Die Geschwindigkeitskonstanten fuer die Reaktionen des H2O2 mit Cd-EDTA3- und Pb-EDTA3- betragen 2 x 109 dm3 mol-1 s-1 und 2,5 x 109 dm3 mol-1 s-1. Es werden auch einige experimentelle Daten beschrieben, die das Verschwinden von Cd-EDTA3- in Gegenwart einiger Alkohole betreffen, fuer die Reaktion Cd-EDTA3- + Pb-EDTA2- wurde eine Geschwindigskeitskonstante von 4 x 106 dm3 mol-1 s-1 ermittelt. Dieser Wert wurde mit einem Wert verglichen, der mit Hilfe der Theorie von Marcus bestimmt wurde. (orig.)Journal
Radiochimica Acta; ISSN 0033-8230; 
; v. 27(1); p. 15-18
; v. 27(1); p. 15-18
[en] The radiolysis of aqueous solutions of Cu EDTA2- in the presence of a number of alcohols was studied by the pulse-radiolysis technique. After the reduction of Cu EDTA2-by e-sub(aq) a complex is formed between Cu (I) EDTA3-and the radicals resulting from the H-abstraction of the alcohols by OH and H radicals (.ROH). The absorption spectra for a number of these complexes are reported. For the following reactions the rate constants were determined in the presence of n-butanol as a radical scavenger (dm3 mol-1 s-1): Cu EDTA2- + e-sub(aq) as 6 x 109 (pH = 7); Cu EDTA2- + OH as 2 x 109 (pH = 7.5); Cu (I) EDTA3- + .R-OH as 4 x 109 < k < 5 x 109 (pH = 7.5); Cu EDTA2- + .R-OH as 5 x 105 < k < 1 x 106 (pH = 7.5) and ROH Cu EDTA3- + NO2- as 4 x 105 (pH = 7.5). The value of the molar extinction coefficient of ROH Cu EDTA3- at 440 nm is 5 x 103 dm3 mol-1 cm-1. (author)
Journal
Radiation Physics and Chemistry; ISSN 0146-5724; ; v. 16(1); p. 5-10
; v. 16(1); p. 5-10
[en] The construction of a computerized pulse-radiolysis system is described, employing an adapted multichannel pulse height analyzer system and an electron accelerator operating on a 25 Hz frequency. As a test for the performance the absorption spectra of e-sub(aq) and (CNS)-2, together with the kinetics of the formation of (CNS)-2 in aqueous solution were measured and compared with the published data. (Auth.)
Journal
Nuclear Instruments and Methods; ISSN 0029-554X; ; v. 151(3); p. 381-386
; v. 151(3); p. 381-386