Selection of the most appropriate SQGs for specific applications
can be a daunting task for sediment assessors. This task
is particularly challenging because limited guidance is currently
available on the recommended uses of the various SQGs.
In addition, the numerical SQGs for any particular substance
can differ by several orders of magnitude, depending on the
derivation procedure and intended use. The SQG selection
Correspondence to: D. D. MacDonald process is further complicated due to uncertainties regarding