Since Reeves, (1992) devised the term "hyper accumulator" a voluminous literature is available where different researchers have defined this term in their own way. This has created a lot of confusion among the scientific community by leaving them at the cross roads. can any one clarify me on that.
From van der Ent et al. (2013): "On this basis, we recommend the following concentration criteria for different metals and metalloids in dried foliage: 100 μg/g for Cd, Se and Tl; 300 μg/g for Co, Cu and Cr; 1,000 μg/g for Ni, Pb and As; 3,000 μg/g for Zn; and 10,000 μg/g for Mn, with plants growing in their natural habitats. If these criteria are adopted more than 500 plant taxa have been cited in the literature to date as hyperaccumulators of one or more elements (As, Cd, Co, Cu, Mn, Ni, Pb, Se, Tl, Zn)."
https://www.researchgate.net/profile/Antony_Ent
Certain plants called hyperaccumulators absorb unusually large amounts of metals in
comparison to other plants (e.g. up to 0.1% chromium, cobalt, copper or nickel or 1% zinc, manganese in the above ground shoots on a dry weight basis).
the rate of accumulation depend on many things
Alkalinity (pH)
Temp.
the concentration
period of exposure
species you work on
the soil type
If the Bioconcentraion factor of plant is more than 1 it is termed as hyperaccumlator. As heavy metal mobility in soil to plants and accumulation in plants is governed by several factors i.e. soil pH, organic matter etc as well as plants itself.
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