Trace metals include essential elements such as Fe as well as toxic metals such as Cd and Hg.
The Precious Metals include gold, and silver.
Hypoallergenic metals include tungsten, titanium and platinum.
The geochemically abundant metals, of which there are five (aluminum, iron, magnesium, manganese, and titanium), constitute more than 0.1 percent by weight of Earth's crust, while the geochemically scarce metals, which embrace all other metals (including such familiar ones as copper, lead, zinc, gold, and silver), constitute less than 0.1 percent.
Poor selectivity is another disadvantage of these extractants since they can co-extract several metals, including impurity elements such as iron and aluminium even at low pH (Sahu et al. 2013).
The structures of asphaltenes are formed by polyaromatic cores attached to aliphatic chains containing heteroatoms, such as nitrogen, oxygen, sulfur, and metals including vanadium, iron, and nickel (Chianelli et al. 2007; Mullins et al. 2012; Mullins 2011; Groenzin and Mullins 1999, 2000).
In May 2009 the American Academy of Pediatrics issued new guidelines, developed in conjunction with the NIEHS, recommending that private well owners test their drinking water at least once per year for contaminants such as nitrate, coliform bacteria, and metals including lead and arsenic.
Biologic specimens, such as blood, can also indicate long-term internal dose to various metals, including lead and mercury.
Chemical compounds that may cause contact dermatitis include such metals as nickel and chromium, certain aniline dyes, and many types of drugs.
Depending on alloys used for femoral stem and acetabular shell designs, such metal debris may include CoCr, Ti6Al4V and other particles.
