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WHAT IS ARSENIC<br />
• Arsenic (As) is a metalloid, which occurs<br />
naturally in the bedrock<br />
• Arsenic and many of its compounds are<br />
toxic and environmentally hazardous<br />
• Arsenic can exist in four oxidation states:<br />
As(-III), As(0), As(III), and As(V).<br />
– As 3+ is more toxic than As 5+<br />
• Solubility of arsenic depending on pH and<br />
oxidation/reduction conditions<br />
©Zumdahl, Chemistry, 1993<br />
Raisa Neitola, GTK Mintec<br />
24.10.2012 5
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