ALS Product catalogues SOIL, SLUDGE and SEDIMENT | Page 25

PASSIVE SAMPLING
Passive sampling offers several advantages over conventional
sampling. The sampler is deployed for extended periods of time (often
days or weeks), enriching trace analytes to facilitate their detection
and quantification. The results obtained are concentrations averaged
over the sampling time. ALS offers passive samplers for metals in soil/
sediment.
PS Metal
PS Metal is used to sample metals in situ in soil and sediment. The simple plastic sampler
contains a filter, a hydrogel, and an ion exchange resin. Metal ions in water diffuse
through the filter and the gel, and finally accumulate in the ion exchange resin. The
longer the sampling time, the larger the amounts of ions accumulated. The ions are then
eluted from the resin with acid, and can be determined by ICP-AES or ICP-MS.
Analyses for PS Metal
Analytical package
Basic metal package
(Al, Cd, Co, Cr, Cu, Fe, Mn, Ni, Pb, U, Zn)
Extended metal package
(Ag, Al, Ba, Ca, Cd, Ce, Co, Cr, Cu, Dy, Er, Eu, Fe, Gd, Ho, La, Lu, Mg, Mn, Nd, Ni, Pb, Pr, Sm, Sr, Tb,
Tm, U, Yb, Zn)
LOQs depend on sampling times. Please contact your local sales representative for further information.
The sampler for sediment is in the shape of a narrow wedge that is pushed into the
sediment. The final result is a concentration profile with high spatial resolution.
Metal toxicity is strongly influenced by the complex reactions that take place in natural
aquatic systems. In many cases, the concentration of trace metal that is available for
aquatic organisms differs from both the total concentration and from that of dissolved
metal. In sampling with PS Metal, particle-bound and strongly complexed metal will be
excluded in a manner which corresponds to their non-availability for biota. Consequently,
PS Metal is not directly comparable to either total or dissolved concentrations in an
ordinary water sample. Quantitative results can be calculated for all elements that are
included in our PS Metal analytical packages.
IF YOU CONSIDER PASSIVE
SAMPLING AS
AN INTERESTING TOOL, DO
NOT HESITATE TO CONTACT
US FOR FURTHER
INFORMATION.

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