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The understanding of pollutant transformations, sorption and
transport in soils and uptake by plants is the key to controlling
contaminant movement towards groundwater and accumulation in
food-chains. Some of these major processes were discussed in the
first International Workshop on Pollutants in Porous Media, con
vened in Israel in 1983 (pollutants in Porous Media, Eds. Yaron,
Dagan and Goldshmid, Springer-Verlag, 1984). Since that meeting,
research on contaminant impact on the environment expanded
considerably. New mechanisms explaining inorganic pollutant par
titioning between solid and solution phases in soils were proposed
and tested; specific elements and specific reactions were
investigat ed, and more case studies to evaluate management
practice effects on drinking water quality and accumulation of
contaminants in crops were carried out. The recognition that the
new knowledge needs to be discussed and evaluated, and the
scientific and engineering communities be updated, led the IUPAC
(Interna tional Union of Pure and Applied Chemistry) and IAHS
(Interna tional Association of Hydrological Sciences) Water Quality
Com missions to organize a second International Workshop on pollu
tant behaviour in the vadose zone, hosted by the Institute of Soils
and Water of the Agricultural Research Organization, Israel. In
this workshop, taking place in June 1987, attention was focused on
chemical, physico-chemical and microbial-mediated reactions of
different contaminants in the vadose zone. This book contains
selected works presented in the 1987 workshop by invited special
ists from various disciplines and countries."
The unsaturated zone is the medium through which pollutants move
from the soil surface to groundwater. Polluting substances are
subjected to complex physical, chemical and biological
transformations while moving through the unsaturated zone and their
displacement depends on the transport properties of the water-air
porous medium system. Pollution caused by human activities,
agriculture, and industry, has brought about a growing interest in
the role of the unsaturated zone in groundwater pollution. Due to
the complexity and the multidisciplinary nature of the subject, it
is being investigated by specialists from various scientific
disciplines, such as soil physicists, chemists, biologists, and
environmental engineers. This state of affairs has motivated the
initiative taken by the Water Quality Commissions of IUPAC (the
International Union of Pure and Applied Chemistry) and IAHS (the
International Association of Hydrological Sciences) to convene an
international workshop, which was organized and hosted by the
Institute of Soils and Water of the Agricultural Research
Organization in Bet Dagan, Israel in March 1983. The lecturers at
the workshop were an invited group of specialists who are engaged
in studying the many facets of the unsaturated zone, and the
present book is a selection of their presentations. Each chapter of
the book relates to a different aspect of the unsaturated zone."
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