Abstract
SUMMARY Pollution has become an increasing problem during the last several decades. Environmental magnetism provides a useful method for detecting and monitoring soil and sediment pollution. Thermomagnetic analysis is a conventional approach for identifying magnetic phases or possible thermal alterations in samples. Magnetic properties of samples are often enhanced after thermal treatment of environmentally polluted samples. In this study, we investigated the possible role of metallic iron for magnetic enhancement due to interaction between iron and haematite at elevated temperature. Our results show that synthetic samples containing both haematite and iron show significant magnetic enhancement upon heating in argon due to the neo-formation of magnetite. Moreover, magnetite formed during heating in argon is rather stable, whereas that produced upon heating in air is oxidized to haematite at higher temperatures. We found that a small amount of iron can induce significant transformation of haematite into magnetite upon heating in argon. Therefore, such a mechanism has to be considered for magnetic enhancement when conducting thermomagnetic analyses of environmentally polluted samples.
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