文档介绍：Hindawi Publishing Corporation
Journal of Automated Methods and Management in Chemistry
Volume 2007, Article ID 49535, 6 pages
doi:
Research Article
Using Sequential Injection Analysis to Improve System
and Data Reliability of Online Methods: Determination
of Ammonium and Phosphate in Coastal Waters
Carsten Frank1, 2 and Friedhelm Schroeder1
1 GKSS Research Centre, Institute for Coastal Research, Max-Planck-Strasse, 21502 Geesthacht, Germany
2 University of Lueneburg, 21332 Lueneburg, Germany
Received 16 October 2006; Accepted 18 December 2006
This article summarises the advantages of the sequential injection analysis (SIA) for the online determination of nutrients in
coastal waters. It concentrates on techniques to improve the reliability of the gained data by continuously monitoring one or more
standards and on the advantages of online standard additions and offline determination of manually collected samples with the
online SIA system. These measures are advantageous during method development and validation and can be used to verify the
system performance on a regular base to reduce the amount of erroneous results. No changes in the flow system are necessary and
the sample throughput is only slightly reduced. These techniques have been applied to a SIA system which is able to simultaneously
determine ammonium and phosphate at a rate of more than 100 samples per hour each and detection limits (3σ)
μM. Results from a campaign in summer 2005 are shown.
Copyright © 2007 C. Frank and F. Schroeder. This is an open access article distributed under the mons Attribution
License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly
cited.
1. INTRODUCTION be reliable, fast and mobile. While the mobility of a sys-
tem is a relative feature, the sensitivity is given by the re-
Online methods are analytical methods aimed for the di- spective a