[Todos] Seminario INQUIMAE - DQIAQF - JUEVES - 19 de mayo 13hs.

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Seminario DQIAQF - INQUIMAE,  Jueves 19 de Mayo - 13 hs.

Aula de Seminarios INQUIMAE - DQIAQF
Facultad de Ciencias Exactas y Naturales
Ciudad Universitaria - Pab. 2  -  Piso 3

*Paul** Worsfold***

*University of Plymouth, Plymouth, **Devon, **UK*



*Flow injection techniques for investigating the biogeochemistry of dynamic
aquatic environments*

Instrumental analytical techniques are critical for improving our
fundamental understanding of environmental processes. In addition to the
challenge of environmentally relevant detection limits is the need for
high
temporal and spatial resolution measurements. In this context there is a
growing need for rapid and reliable but relatively low cost techniques
that
can be remotely deployed to provide high quality environmental data. This
presentation describes the evolution of flow injection (FI) based
instrumentation for aquatic environmental monitoring [1]. FI techniques now
impact on a wide cross section of analytical chemistry activities, providing
imaginative and practical solutions to challenging analytical problems and
contributing to the improvement of data quality. Key aspects of field
based
FI systems will be discussed, including reaction chemistry, detector design,
analytical performance, sample presentation and data processing.



Two examples will be used to illustrate the impact of FI techniques at the
interface between environmental analytical chemistry and biogeochemistry.
A
FI manifold with spectrophotometric detection coupled with sequential
enzymatic hydrolysis will be described for the quantification of
individual
classes of organic phosphorus species in the eutrophic Tamar Estuary (SW
England). A FI manifold with chemiluminescence detection will be described
for the determination of iron in remote, open ocean environments. Data
from
these applications will demonstrate how FI can enhance our understanding of
the biogeochemistry of phosphorus and iron (and other species) in aquatic
systems.



[1] Flow analysis techniques for spatial and temporal measurement of
nutrients in aquatic systems, S. Gray, G. Hanrahan, I. McKelvie, A.
Tappin,
F. Tse and P.J. Worsfold, Environmental Chemistry, 3, 3-18 (2006) doi:
10.1071/EN05059.