Chloride ion migration in natural bentonite

N. Nagy, József Kónya

Research output: Contribution to journalArticle

Abstract

The disposal of nuclear wastes in geological formations demands the construction of engineering barriers. Bentonite clay rock is frequently used both as natural and engineering barrier. The natural bentonite rock in its original form is considered as compacted bentonite if the density is higher than 1.2 g/cm3. In this paper, the risk of the extrapolation of the laboratory experiments to field conditions and the high differences of the natural samples are emphasized: as much as 52 % standard deviation was obtained in the migration coefficients characterizing bentonite samples collected from the same site with a very small extent of sampling. Moreover, the bulk densities (1.18-1.87 g/cm3) and montmorillonite content are also rather different (45-71 m/m %).The contradictions of the effects of the swelling clay mineral (montmorillonite) content and the bulk density of bentonite are illustrated: it is shown that the migration rate of chloride anion is determined by the ratio of the different water types (interlayer water of montmorillonite to free pore water of bentonite, including the electric double layer water). The apparent migration coefficients of bentonite clay and concrete (natural and artificial engineering barrier) are compared.

Original languageEnglish
Pages (from-to)1519-1526
Number of pages8
JournalJournal of Radioanalytical and Nuclear Chemistry
Volume298
Issue number3
DOIs
Publication statusPublished - Dec 2013

Fingerprint

Bentonite
Chlorides
Ions
Clay minerals
Water
Clay
Rocks
Radioactive wastes
Extrapolation
Waste disposal
Radioactive Waste
Swelling
Negative ions
Concretes
Sampling
Anions
Minerals

Keywords

  • Bentonite
  • Chloride ion
  • Migration
  • Waste disposal

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging
  • Spectroscopy
  • Public Health, Environmental and Occupational Health
  • Pollution
  • Health, Toxicology and Mutagenesis
  • Nuclear Energy and Engineering
  • Analytical Chemistry

Cite this

Chloride ion migration in natural bentonite. / Nagy, N.; Kónya, József.

In: Journal of Radioanalytical and Nuclear Chemistry, Vol. 298, No. 3, 12.2013, p. 1519-1526.

Research output: Contribution to journalArticle

Nagy, N. ; Kónya, József. / Chloride ion migration in natural bentonite. In: Journal of Radioanalytical and Nuclear Chemistry. 2013 ; Vol. 298, No. 3. pp. 1519-1526.
@article{58a6ecb452584640a95a849e91500636,
title = "Chloride ion migration in natural bentonite",
abstract = "The disposal of nuclear wastes in geological formations demands the construction of engineering barriers. Bentonite clay rock is frequently used both as natural and engineering barrier. The natural bentonite rock in its original form is considered as compacted bentonite if the density is higher than 1.2 g/cm3. In this paper, the risk of the extrapolation of the laboratory experiments to field conditions and the high differences of the natural samples are emphasized: as much as 52 {\%} standard deviation was obtained in the migration coefficients characterizing bentonite samples collected from the same site with a very small extent of sampling. Moreover, the bulk densities (1.18-1.87 g/cm3) and montmorillonite content are also rather different (45-71 m/m {\%}).The contradictions of the effects of the swelling clay mineral (montmorillonite) content and the bulk density of bentonite are illustrated: it is shown that the migration rate of chloride anion is determined by the ratio of the different water types (interlayer water of montmorillonite to free pore water of bentonite, including the electric double layer water). The apparent migration coefficients of bentonite clay and concrete (natural and artificial engineering barrier) are compared.",
keywords = "Bentonite, Chloride ion, Migration, Waste disposal",
author = "N. Nagy and J{\'o}zsef K{\'o}nya",
year = "2013",
month = "12",
doi = "10.1007/s10967-013-2682-9",
language = "English",
volume = "298",
pages = "1519--1526",
journal = "Journal of Radioanalytical and Nuclear Chemistry",
issn = "0022-4081",
publisher = "Elsevier BV",
number = "3",

}

TY - JOUR

T1 - Chloride ion migration in natural bentonite

AU - Nagy, N.

AU - Kónya, József

PY - 2013/12

Y1 - 2013/12

N2 - The disposal of nuclear wastes in geological formations demands the construction of engineering barriers. Bentonite clay rock is frequently used both as natural and engineering barrier. The natural bentonite rock in its original form is considered as compacted bentonite if the density is higher than 1.2 g/cm3. In this paper, the risk of the extrapolation of the laboratory experiments to field conditions and the high differences of the natural samples are emphasized: as much as 52 % standard deviation was obtained in the migration coefficients characterizing bentonite samples collected from the same site with a very small extent of sampling. Moreover, the bulk densities (1.18-1.87 g/cm3) and montmorillonite content are also rather different (45-71 m/m %).The contradictions of the effects of the swelling clay mineral (montmorillonite) content and the bulk density of bentonite are illustrated: it is shown that the migration rate of chloride anion is determined by the ratio of the different water types (interlayer water of montmorillonite to free pore water of bentonite, including the electric double layer water). The apparent migration coefficients of bentonite clay and concrete (natural and artificial engineering barrier) are compared.

AB - The disposal of nuclear wastes in geological formations demands the construction of engineering barriers. Bentonite clay rock is frequently used both as natural and engineering barrier. The natural bentonite rock in its original form is considered as compacted bentonite if the density is higher than 1.2 g/cm3. In this paper, the risk of the extrapolation of the laboratory experiments to field conditions and the high differences of the natural samples are emphasized: as much as 52 % standard deviation was obtained in the migration coefficients characterizing bentonite samples collected from the same site with a very small extent of sampling. Moreover, the bulk densities (1.18-1.87 g/cm3) and montmorillonite content are also rather different (45-71 m/m %).The contradictions of the effects of the swelling clay mineral (montmorillonite) content and the bulk density of bentonite are illustrated: it is shown that the migration rate of chloride anion is determined by the ratio of the different water types (interlayer water of montmorillonite to free pore water of bentonite, including the electric double layer water). The apparent migration coefficients of bentonite clay and concrete (natural and artificial engineering barrier) are compared.

KW - Bentonite

KW - Chloride ion

KW - Migration

KW - Waste disposal

UR - http://www.scopus.com/inward/record.url?scp=84890314169&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84890314169&partnerID=8YFLogxK

U2 - 10.1007/s10967-013-2682-9

DO - 10.1007/s10967-013-2682-9

M3 - Article

AN - SCOPUS:84890314169

VL - 298

SP - 1519

EP - 1526

JO - Journal of Radioanalytical and Nuclear Chemistry

JF - Journal of Radioanalytical and Nuclear Chemistry

SN - 0022-4081

IS - 3

ER -