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Using sequential injection analysis to improve system and data reliability of online methods: determination of ammonium and phosphate in coastal waters.

Frank C, Schroeder F - J Autom Methods Manag Chem (2007)

Bottom Line: 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.Results from a campaign in summer 2005 are shown.

View Article: PubMed Central - PubMed

Affiliation: GKSS Research Centre, Institute for Coastal Research, Max-Planck-Strasse, 21502 Geesthacht, Germany.

ABSTRACT
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 (3sigma) of 0.06 muM and 0.05 muM. Results from a campaign in summer 2005 are shown.

No MeSH data available.


Raw data gained from the phosphate detector.
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Related In: Results  -  Collection


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Figure 6: Raw data gained from the phosphate detector.

Mentions: During the second step of the review, the raw data of therespective time period is analysed (extract in Figures 5and 6) to exclude erroneous results due to, forexample, air bubbles in the sample. These air bubbles can occurdue to a high oxygen concentration in the water caused by highalgal primary production during sunny days. Neither the rawphosphate nor the ammonium data did show any irregularities.


Using sequential injection analysis to improve system and data reliability of online methods: determination of ammonium and phosphate in coastal waters.

Frank C, Schroeder F - J Autom Methods Manag Chem (2007)

Raw data gained from the phosphate detector.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC1828606&req=5

Figure 6: Raw data gained from the phosphate detector.
Mentions: During the second step of the review, the raw data of therespective time period is analysed (extract in Figures 5and 6) to exclude erroneous results due to, forexample, air bubbles in the sample. These air bubbles can occurdue to a high oxygen concentration in the water caused by highalgal primary production during sunny days. Neither the rawphosphate nor the ammonium data did show any irregularities.

Bottom Line: 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.Results from a campaign in summer 2005 are shown.

View Article: PubMed Central - PubMed

Affiliation: GKSS Research Centre, Institute for Coastal Research, Max-Planck-Strasse, 21502 Geesthacht, Germany.

ABSTRACT
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 (3sigma) of 0.06 muM and 0.05 muM. Results from a campaign in summer 2005 are shown.

No MeSH data available.