الفهرس 
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Abstract
Mercury is a well known environmental pollutant and is very toxic
in very low concentration. The present study is concerned with the
I’
evaluation of some methods of the hard problem of preconcentration of
mercury from aqueous samples due to the very low levels of mercury in
environment which are difficult to be detected directly.
This study in the present thesis is divided into 3 chapters.
Chapter I: is an introductory part divided into two sections.
Section A: deals with different properties of mercury such as
General properties, sources to the marine environment, Hg
species, toxification, detoxification, bioaccumulaiton, toxicity, Hg
distribution in atmosphere and aquatic systems, Hg in industry, policies
dealing with Hg pollution, Hg threshold limit vatue (TL V), fate of mercury
in aquatic systems and an example for the determination of mercury in
Egypt.
Section B: A review of preconcentration of mercury from aquatic
samples and the methods of mercury determination.
Chapter 11: deals with the experimental part and study area.
Section (1): Experimental part.
This includes the study of different trials with many chelating
agents such as: Diphenylthiocarbazone (Oithizone) (OZ) , Sodium
diethyldithiocarbamate (NaDDC) and Ammonium pyrrolidine
dithiocarbamate (APDC) and loading them on the supporting materials
XAD-2 or XAD-4. Then using them as Hg preconcentrating agents.
The trials aimed to reach the most optimum conditions leading to
the best recovery of Hg from aquatic samples putting in consideration
the economicity of the chemicals used.