Details
| Original language | English |
|---|---|
| Pages (from-to) | 63-70 |
| Number of pages | 8 |
| Journal | Colloids and Surfaces A: Physicochemical and Engineering Aspects |
| Volume | 217 |
| Issue number | 1-3 |
| Publication status | Published - 30 Jan 2003 |
| Externally published | Yes |
Abstract
The generation of Th(IV) colloids is investigated by laser-induced breakdown detection (LIBD) combined with ultrafiltration in the concentration range from 10-5 to 10-2 M at pH 3-5 in 0.5 M NaCl. The amount of colloids generated by coulometric titration of initially ionic thorium solutions depends on the total thorium concentration and the degree of over-saturation with regard to the thermodynamic solubility limit of solid Th(IV) hydroxide at given pH. These generated thorium colloids are found to be small in size and remain stable up to 400 days of investigation, without a tendency towards agglomeration or precipitation. A dilution of the suspension at constant pH downgrades colloids to ionic species, while a dilution with 0.5 M NaCl of neutral pH causes an increased over-saturation and colloid generation, leading to an equilibrium between colloids and ionic species. This equilibrium is comparable to the thermodynamic solid-liquid equilibrium of amorphous Th(IV) hydroxide. The present results allow a precise estimation of colloid generation in the dissolution of a Th(IV) hydroxide solid phase. Such a possibility may facilitate the practical solubility assessment of metal hydroxides in natural aquifer systems.
Keywords
- Colloid formation, Colloid stability, LIBD, Solubility, Thorium hydroxide, Ultrafiltration
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Surfaces and Interfaces
- Chemistry(all)
- Physical and Theoretical Chemistry
- Chemical Engineering(all)
- Colloid and Surface Chemistry
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In: Colloids and Surfaces A: Physicochemical and Engineering Aspects, Vol. 217, No. 1-3, 30.01.2003, p. 63-70.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Study of the generation and stability of thorium(IV) colloids by LIBD combined with ultrafiltration
AU - Bitea, C.
AU - Müller, Ralf
AU - Neck, V.
AU - Walther, Clemens
AU - Kim, J. I.
N1 - Funding information: The present work was financially supported by the European commission, in the frame of the ACTAF program within the 5th R&D framework program (contract No. FIKW-CT-2000-00035).
PY - 2003/1/30
Y1 - 2003/1/30
N2 - The generation of Th(IV) colloids is investigated by laser-induced breakdown detection (LIBD) combined with ultrafiltration in the concentration range from 10-5 to 10-2 M at pH 3-5 in 0.5 M NaCl. The amount of colloids generated by coulometric titration of initially ionic thorium solutions depends on the total thorium concentration and the degree of over-saturation with regard to the thermodynamic solubility limit of solid Th(IV) hydroxide at given pH. These generated thorium colloids are found to be small in size and remain stable up to 400 days of investigation, without a tendency towards agglomeration or precipitation. A dilution of the suspension at constant pH downgrades colloids to ionic species, while a dilution with 0.5 M NaCl of neutral pH causes an increased over-saturation and colloid generation, leading to an equilibrium between colloids and ionic species. This equilibrium is comparable to the thermodynamic solid-liquid equilibrium of amorphous Th(IV) hydroxide. The present results allow a precise estimation of colloid generation in the dissolution of a Th(IV) hydroxide solid phase. Such a possibility may facilitate the practical solubility assessment of metal hydroxides in natural aquifer systems.
AB - The generation of Th(IV) colloids is investigated by laser-induced breakdown detection (LIBD) combined with ultrafiltration in the concentration range from 10-5 to 10-2 M at pH 3-5 in 0.5 M NaCl. The amount of colloids generated by coulometric titration of initially ionic thorium solutions depends on the total thorium concentration and the degree of over-saturation with regard to the thermodynamic solubility limit of solid Th(IV) hydroxide at given pH. These generated thorium colloids are found to be small in size and remain stable up to 400 days of investigation, without a tendency towards agglomeration or precipitation. A dilution of the suspension at constant pH downgrades colloids to ionic species, while a dilution with 0.5 M NaCl of neutral pH causes an increased over-saturation and colloid generation, leading to an equilibrium between colloids and ionic species. This equilibrium is comparable to the thermodynamic solid-liquid equilibrium of amorphous Th(IV) hydroxide. The present results allow a precise estimation of colloid generation in the dissolution of a Th(IV) hydroxide solid phase. Such a possibility may facilitate the practical solubility assessment of metal hydroxides in natural aquifer systems.
KW - Colloid formation
KW - Colloid stability
KW - LIBD
KW - Solubility
KW - Thorium hydroxide
KW - Ultrafiltration
UR - http://www.scopus.com/inward/record.url?scp=0038369838&partnerID=8YFLogxK
U2 - 10.1016/S0927-7757(02)00559-9
DO - 10.1016/S0927-7757(02)00559-9
M3 - Article
AN - SCOPUS:0038369838
VL - 217
SP - 63
EP - 70
JO - Colloids and Surfaces A: Physicochemical and Engineering Aspects
JF - Colloids and Surfaces A: Physicochemical and Engineering Aspects
SN - 0927-7757
IS - 1-3
ER -