The first part provides a very broad overview of the state of knowledge on arsenic, particularly in terms of its geochemical distribution, analysis of the relationship between the living environment and the metalloid, and a description of feedback from industrial experience. Finally, the compilation of thermodynamic data available in the literature provides a coherent basis for the criticised data, necessary for equilibrium modelling and sensitivity studies to variations in intensive parameters. The second part brings together all the experimental and modelling results relating to the characterisation of a sample of roasted pyrite ash supplied by an industrial company. The main objectives of this study were to study experimentally the environmental behaviour of an average sample of roasted pyrite ash containing arsenic (As) and to generalise the approach to waste or soil containing arsenic.
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