Owing to their presence in soil, water, and dust, heavy metals such as arsenic, mercury, cadmium, and lead are known to be present in many agricultural and food products, including chocolates.

common in the Earth's crust but are present in many aspects of modern life. Some heavy metals are either essential for human health (such as . ron, cobalt, and zinc) but can be toxic in larger amounts …

It is not clear exactly what levels of heavy metals in soil are safe or unsafe, so the following information is provided only to help you understand your test results and the relative level of risk they represent.

Bjerrum’s definition of “heavy metals” is based upon the density of the elemental form of the metal, and he classifies “heavy metals” as those metals with elemental densities above 7 g/cm3. Over the …

"Heavy" by Mary Oliver, from Thirst. © Beacon Press, 2007.

Heavy metals are individual metals and metal com-pounds that can impact human health. Eight common heavy metals are discussed in this brief: arsenic, barium, cadmium, chromium, lead, …

For convenience purposes, in general terms « heavy oils » include categories A+B+C, and « extra-heavy oils » include categories B+C, i.e. extra-heavy oils and oil sands