Coulometric titration in the study of metal ion-ligand equilibria

Głąb, Stanisław; Hulanicki, Adam; Nowicka, Urszula

doi:10.1016/0039-9140(92)80141-y

Cited by 2 publications

(1 citation statement)

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“…Their complexation properties have been thoroughly investigated. It is generally admitted that Good buffers exhibit only very weak complexation behavior with metal ions [12,19], although one of them TAPS forms complexes with metal ions at a significant level (ex: CuTAPS log K 5 4.1 [20]). Experimental deviations above 9% have been observed of the apparent mobility for Np(V) and Pu(V) at pH 9 compared with the adjacent buffers HEPES and CHES.…”

Section: Effect Of the Buffer Composition And Temperature Increasementioning

confidence: 99%

Direct determination of plutonium(V) and neptunium(V) complexation by carbonate ligand with CE‐ICP‐sector field MS

2009

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Direct determination of the stability constants of some pentavalent actinides (Np and Pu) with carbonate ligands was investigated by CE-ICP-sector field MS (SFMS). The high sensitivity of ICP-SFMS coupled with the high separation power of CE makes it possible to determine the mobility of each species as well as the stability constants with good accuracy. A procedure for preparing pentavalent plutonium at trace level has been successfully tested enabling the study of Pu(V) complexation by CE-ICP-SFMS. Stability constants beta1, beta2 and beta3 have been obtained at 25 +/- 1 degrees C at a constant ionic strength of 0.37 M in NaClO4 for K1 and NaCl for beta2 and beta3. The results were extrapolated to zero ionic strength and compared with data available in the literature for Np(V). The following stability constants were obtained for a Pu(V)/CO3 system: logbeta(1)(0) = 4.95 +/- 0.10, logbeta(2)(0) = 6.34 +/- 0.10, and logbeta(3)(0) = 5.61 +/- 0.16.

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Section: Effect Of the Buffer Composition And Temperature Increasementioning

confidence: 99%