Carmel-by-the-Sea's New Food Packaging Requirements Council Discretionary Funds Grant Application Packet
Introduction. The term heavy metal refers to any metallic chemical element that has a relatively high density and is toxic or poisonous at low concentrations. Examples of heavy metals include mercury (Hg), cadmium (Cd), arsenic (As), chromium (Cr), thallium (Tl), and lead (Pb).
Palladium (Pd) is a precious metal that, together with iridium (Ir), platinum (Pt), rhodium (Rh), ruthenium (Ru), and osmium (Os), belongs to the platinum group elements (PGEs). Pd is one of the rarest elements in the earth's crust and its main ore deposits are found in the Russian Federation and South Africa.