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Technical Components

   
 
 

 

Technical Components

The technical components are the data management system. the automatic nutrient analysers and the automatic sampler for organic micropollutants. You can get detailed descriptions to the single components, if you follow the links below.

Data Management System:

The MARNET/SAMSON stations are equipped with a data management system, enabling an ashore access to the data at any time as well as sensor and system configuration of the sea station. In addition, the measuring data are transmitted hourly via METEOSAT satellite to the BSH headquarter.
The contact between the BSH headquarter and the sea stations is built up by the operator via GSM telemetry. The computer system of the sea station controls all sensors and devices (e.g. measuring intervals), records the raw data of the measurements and calculates the corresponding physical values. The simultaneous measurements of all physical and chemical parameters enable a rapid, complete and interdisciplinary data evaluation.The online access supplies a direct overview about the current operating state and enables, as required, changes in the temporal resolution of measurements.
All data are checked for quality. Apart from this the data are subjected to a daily plausibility control, which among others allows the observation of sensor and device functions.

plan of data management system

Scheme of the data management system: All measurements of the sea station are recorded by a computer system. The data are transmitted to the shore based station via Meteosat.

Automatic Nutrient Analysers

Automatic Pumping Photometer (APP):

Automatic Pumping Photometer (APP)  

  •   determination of nutrient concentrations (phosphate, silicate, nitrate/nitrite) in sea water
  •   photometric determination based on optimised standard colour reactions used in sea water analysis
  •   maintenance-free operation for 4 to 6 weeks

 

 

 

APP installation on the station Deutsche Bucht
(on the right: refrigerator for cool and dark storage of the reagents)

 

Automatic Chemical Analyser (ACA):

  •   for the fluorimetric determination of ammonium according to the OPA/sulfite-method

The operation of an APP, based on the application of the photometric indophenol blue method, turned out to be unsuitable for the automatic determination of submicromolar ammonium concentration in sea water. Reasons for this are among others a low sensitivity and reproducibility, high and variable blanks as well as matrix effects.

Automatic Chemical Analyser (ACA) On the other hand the following advantages were reported for the fluorimetric determination of ammonium by the OPA (ortho-phtaldialdehyde) / sulfite -method (Aminot A., Kérouel R. & Birot D. (2001): Water Research 35, 1777-1785; Kérouel R. & Aminot A. (1997): Marine Chemistry 57, 265-275; Holmes R.M. et al. (1999): Can. J. Fish. Aquat. Sci. 56, 1801-1808):

  •   high sensitivity and reproducibility
  •   linear range up to 50 µmol/L
  •   low detection limit (0.02 - 0.03 µmol/L)
  •   low matrix effects in sea water
  •   low interferences with amino acids and urea

 

 

 

 

To use this method for automatic measurements on marine stations, the company Sea & Sun Technology GmbH (Trappenkamp, Germany) has developed a prototype of a fluorimetric ACA, which is currently in the test phase. At present the OPA/sulfite-method is optimised in the BSH laboratory Sülldorf for this device and its special use.

Automatic Sampler (EPOS):

EPOS = Event-controlled sampler for organic micropollutants

The EPOS has been developed for the automatic, time and/or event controlled sampling of organic micropollutants on MARNET-stations . The device has been developed and constructed in close co-operation with the company Sea & Sun Technology GmbH (Trappenkamp, Germany).
 

Automatic Sampler (EPOS)   Principles
  •   solid / liquid phase separation by filtration and subsequent solid phase extraction (SPE) of the liquid phase
  •   selection of a wide range of adsorber materials and adsorber volumes
  •   flexible choice of sample volume and sampling rate

Specifications
  •   overall dimensions: 66 x 50 x 24 cm
  •   flow rate: 1 to 10 L/h,


    total flow accuracy: ± 2 %

  •   filter units: 6 filter housings made by titanium or stainless steel and glass fibre filter


    (porosity 0.5 µm)

  •   adsorption columns: 6 glass columns,


    ID 20 mm, both sides height adjustable

  •   pump: ceramic piston pump, differential pressure up to 6.9 bar

Laboratory
Filling and precleaning of the adsorption columns and filter units
Sea Station Installation Sampling
Shore Based Station
Time or event controlled sampling according to the monitoring targets
Laboratory
Eluation of the adsorption columns and ultrasonic extraction of the filters by organic solvents
Quantification of selected polycyclic aromatic hydrocarbons (PAH), chlorinated hydrocarbons (CHC), polychlorinated biphenyle (PCB) and polar pesticides by GC-MS or LC-MS/MS

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More information on the subject:
MARNET monitoring system

Contact


If you have any additional questions, please e-mail Kai Herklotz or phone +49 40 3190 - 3230
Sieglinde Weigelt-Krenz or phone +49 40 3190 - 3310

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