As part of a project investigating the air-water exchange of nutrients and
inorganic micropollutants to the North Sea, the atmospheric deposition of n
utrients and trace metals in their different compositions and via various p
athways was investigated. Intensive sampling campaigns were organised on th
e research vessel Belgica (ns 21/98 campaign from September 28 to October 1
, 1998 and ns 10/99 campaign from April 19 to 23, 1999), at a sampling stat
ion near the Belgian coast (Knokke-Heist) and at the University campus of A
ntwerp. Simulation work and remobilisation experiments were carried out to
obtain a general view of the kinetics of solubilisation of the constituents
under investigation. Sample treatment requires a leaching system with a qu
antitative recovery of the species of interest in the leaching solution wit
hin a reasonably short period of time (30 min).
For this reason, a re-circulation leaching system was developed, tested, op
timised and compared with a more accepted ultrasound leaching method.