Biogeochemistry

The biogeochemistry laboratory in the Oceanography department at UCT performs routine hydrographic measurements such as nutrient concentrations (NO3, NO2, NH4, SiO4, PO4, urea), dissolved oxygen, chlorophyll and pH. An automated system (flow injection auto-analyser) is available for NO3, SiO4 and PO4 analyses while NH4 is determined fluorometrically. All of the above nutrient concentrations can be determined manually using a colourimetric method.

The following equipment is available:

  1. Lachat QuikChem 8500 series 2 – 3 channels : currently set-up for the automated determination of NO3, SiO4 and PO4
  2. Turner fluorometer
  3. Metrohm 848 Titrino+
  4. Digital burette
  5. Crison pH meter
  6. Spectrophotometers (UV/vis)
  7. Access to mass spectrometer for 15N analyses
  • Filter stand used to filter seawater samples during nutrient cycling experiments.
  • For the measurements of primary productivity and nutrient cycling rates, samples can be incubated in-situ instead of using incubators.
  • Incubators are used to replicate light levels from various depths and maintain a controlled temperature in order to estimate primary productivity and nitrogen cycling rates.
  • Incubators which have been set up on the SA Agulhas II during a research cruise in the Southern Ocean.
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  • Collection of samples for a nitrogen cycling study in St Helena Bay.
Related News and Publications

The biogeochemistry laboratory in the Oceanography department at UCT performs routine hydrographic measurements such as nutrient concentrations (NO3, NO2, NH4, SiO4, PO4, urea), dissolved oxygen, chlorophyll and pH. An automated system (flow injection auto-analyser) is available for NO3, SiO4 and PO4 analyses while NH4 is determined fluorometrically. All of the above nutrient concentrations can be determined manually using a colourimetric method.

The following equipment is available:

  1. Lachat QuikChem 8500 series 2 – 3 channels : currently set-up for the automated determination of NO3, SiO4 and PO4
  2. Turner fluorometer
  3. Metrohm 848 Titrino+
  4. Digital burette
  5. Crison pH meter
  6. Spectrophotometers (UV/vis)
  7. Access to mass spectrometer for 15N analyses
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