They are the result of air emissions from combustion plants, oil, ore mining, industrial processes, incinerators, elimination of the mining and industrial waste, food industry (long-term use of some chemical compounds for plant protection led to increased amounts of copper, mercury, cadmium and lead in soil, then contaminating the food).
They are generally found at the particles level (except mercury which is mainly gaseous).
Water and air can be considered as renewable sources, but in soils the effect of human activity is more persistent and often irreversible.
Certain foods (e.g. Cacao, chocolate, broccoli, nuts, bananas), dental restorations, protheses (hip, knee, cochlear and cardiac implants), coins, jewelry, color pigments, cosmetics, stainless steel cutlery and pots, iuds, incinerators, tobacco smoke, industrial exhaust
Dental implants, restorations, pigments, pins and screws; orthopedic protheses, pacemakers, vascular stents, whitening agent (E171) in food and pharmaceutical products (medications, toothpaste, cosmetics), coating agent, jewelry
Dental crowns and bridges, jewelry, pharmaceuticals (e.g. For rheumatoid arthritis), food coloring (E175) in sweets, porcelain decorations
Dental crowns, bridges, and root pins; car exhaust, jewelry, electronic equipment, spinning- and weaving mills.
Metal industry, aircraft construction, ceramic industry, transistors, vegetables, dental restorations, fluorescent lamps, photography.
Amalgam fillings (50% mercury), thermometers, batteries, disinfectants, gas meters
Dental restorations, paints, soldering material, jewelry, galvanic products, glass and ceramic industry, catalysts, toothpaste (snf 2)
Vaccines (thimerosal), contact lens solutions, eye drops
Fish and crustaceans
Deoderants, dental restorations (Ti-Al alloys), vaccines (as adjuvants), electronic industry, metal industry, vegetables
Jewelry, dental crowns and bridges, catalysts, photo materials, cytostatics
Amalgam and dental restorations, supplements (vitamins and minerals), iuds, medicinal baths, electronic industry, pigments
Jewelry, coins, fertilizer, dental restorations, cement and other building materials
Jewelry, electroplating, dyes, wood impregnation, incinerators, welding, Cr-Fe alloys, dental materials, cement, household items (Chromium-Nickel-Steel)
Dental restorations, electronic industry, solar cells (cuinse), metal alloys, medicinal radioisotopes
Steel industry, color pigments, dental materials (Co-Cr-Mo), fossil fuels, oil refineries, lubricating oil
Palladium-containing dental materials, thermometers, diodes, solar batteries
Gold alloys, electronics, catalysts, platinum/iridium-alloys in jewelry
Dental alloys, ceramics
Titanium alloys, implant materials, incinerators, catalysts
Amalgam and dental restorations, jewelry, food coloring (E174), coins, antiseptics (silver nitrate), pharmaceuticals, photo and copy industry
Mineral water in plastic bottles (PET), alloys, textile (flame retardant)
Agricultural insecticides, cereal (rice and wheat), vegetables, seafood, wood processing, glass industry, electronic equipment, alloys