title: New microprofiling and micro sampling system for water saturated environmental boundary layers.
abstract: The spatial high resolution of a microprofiling system was combined with the multi element capability of ICP-MS to enable a better understanding of element distributions and related processes across environmental boundary layers. A combination of a microprofiling system with a new micro filtration probe head connected to a pump and a fraction collector (microprofiling and micro sampling system, missy) is presented. This enables for the first time a direct, dynamic, and high resolution automatic sampling of small water volumes (<500 μL) from depth profiles of water saturated matrices (e.g., sediments, soils, biofilms). Different membrane cut-offs are available, and resolutions of a few (matrices with a high physical resistance) to a submillimeter scale (matrices with low physical resistance) can be achieved. In this Article, (i) the modular setups of two missys are presented; (ii) it is demonstrated how the micro probe heads are manufactured; (iii) background concentrations and recoveries of the system as well as (iv) exemplary results of a sediment water interface are delivered. On the basis of this, potentials, possible sources of errors, and future applications of the new missy are discussed.
authors: Federal Institute of Hydrology (BfG) , Koblenz, Germany.
authors: Anne-Lena
authors: AL
authors: Fabricius
authors: Lars
authors: L
authors: Duester
authors: Dennis
authors: D
authors: Ecker
authors: Thomas A
authors: TA
authors: Ternes
mesh_terms: D004777:Environment; D019015:Geologic Sediments / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D008670:Metals / Q000032:analysis; D008904:Miniaturization / Q000379:methods*; D010084:Oxidation-Reduction; D010100:Oxygen / Q000032:analysis; D016062:Porosity; D013054:Spectrophotometry, Atomic; D014867:Water / Q000737:chemistry
chemical_list: D008670:Metals; D014867:Water; D010100:Oxygen