Biochar has the ability to sorb a variety of contaminants. The results shown here indicate
that different biochar materials will be best suited for different contamination problems,
hence supporting the concept of “designer biochar”. While laboratory studies have
provided very promising data, the extent to which biochar and its ash can impact the
mobility of heavy metals, organic contaminants and hydrocarbons in soil in the field has
not been studied to date. Such studies are needed to better determine the potential of
biochar as a tool for soil remediation and land reclamation, and these studies should take
place on the long term. Biochar should be studied alongside other soil amendments which
can mitigate contamination problems, to determine the advantages and disadvantages of
each.