The metal ic chemical elements collectively known as precious metals are cal ed as such because of their extreme rarity and high economic value. Precious metals occur natural y or are by-products of the
processing of other less rare metals.
In order of increasing mass abundance (parts per bil ion), the precious metals are rhenium, rhodium, iridium, ruthenium, osmium, gold, platinum, pal adium, and silver. These metals are not radioactive and are mostly used for industrial purposes and for jewelry.
Stil , precious metals have some safety issues attached to them:
Rhenium:
Since rhenium is used in very smal amounts, its toxicity is virtual y unknown. The hazardous property of rhenium halide, for example, may be attributed either to rhenium itself or to the other elements that make up the compound. Another rhenium compound - potassium perrhenate - is known to have a median lethal dose much like that of sodium chloride (commonly known as table salt).
Rhodium:
Although rhodium is inert (being a noble metal, as almost al the other precious metals are), it can be reactive, especial y if used as compounds. In its basic form, however, rhodium is not known to cause any harm.
Iridium:
Iridium, when finely divided, can pose some hazards - it can ignite in air. Apart from this, accidental exposure to a radioisotope of iridium may cause poisoning by radiation, burns, and even death.
Ruthenium:
Three conditions may be associated with exposure to ruthenium: it can stain the skin; it may accumulate in bones; and it may increase the risk of cancer. Ruthenium tetroxide, a yel ow, diamagnetic tetrahedral ruthenium compound, is highly toxic and volatile; it may explode if it comes into contact with combustible materials.
Osmium:
Osmium, like iridium, can ignite spontaneously in air when in finely divided form. The compound osmium tetroxide, in particular, is highly volatile and is extremely toxic if accidental y inhaled, ingested, or comes into contact with the skin.
Gold:
Gold, in its elemental form, does not cause irritation and is not toxic even when ingested. In fact, it is used as a component in some alcoholic drinks and as a food additive. However, ionic chemical compounds of gold (example, gold chloride) can be extremely harmful to the kidneys and liver.
Platinum:
Findings by the U.S. federal agency CDC reveal that exposure to platinum salts, on the short term, may cause nose, throat, and eye irritation. Long-term exposure to these compounds, on the other hand, may cause skin and respiratory al ergies.
Palladium:
Pal adium in bulk metal ic form is completely inert. The same can't be said though of the metal in finely divided form, which can readily ignite in air.
Silver:
Silver compounds (example, colloidal silver), when absorbed into the body, may cause argyria, a condition characterized by the bluish-gray pigmentation of the skin, mucous tissues, and the eyes. While the
condition is not real y harmful to one's health, it is often permanent. Otherwise, silver per se is not at al toxic.
It certainly is important to know that each of the precious metals has possible health hazards so that first-time handlers can take the necessary precautions.
Written By Simon Newcombe
Silver: Precious Metal With The Highest Thermal And Electrical