BONUS PINBAL

Development of a spectrophotometric pH-measurement system for monitoring in the Baltic Sea

Gregor_Rehder
BONUS PINBAL coordinator, Gregor Rehder

Share of the BONUS funding: EUR 482 680
Duration: 3 years, 1.4.2014-31.3.2017

Summaries of annual reports:
BONUS PINBAL final report
BONUS PINBAL year 2 report
BONUS PINBAL year 1 report

Abstract
The pH of seawater is a key variable of the marine acid/base system. High precision measurements of pH in combination with other parameters are invaluable to fully describe the marine CO2 system, to study biogeochemical processes, and to trace “ocean acidification”.

Despite the recognised importance of pH, a standard procedure for long-term and comparable pH-measurements with high accuracy and precision has not been established, hampered by the use of different pH-standards and problems with probe calibration.

Assessing pH in brackish water systems like the Baltic faces particular methodological challenges due to e.g. the large salinity and pH range encountered, or the occurrence of hydrogen sulfide.

Within BONUS PINBAL, a consortium of the Leibniz Institute for Baltic Sea Research, the German SME CONTROS Systems & Solutions GmbH, the University of Gothenburg and the Institute of Oceanology of the Polish academy of Sciences will cooperatively fulfill the still required fundamental chemical work, system and software design and field testing to realize a prototype of a spectrophotometric pH-measurement system for continuous underway measurements as well as for discrete samples. At the end of the project, it is envisaged to have prototypes running at the involved partners, which are involved in the HELCOM monitoring programme, and a technology developed at CONTROS which allows a product for the market in the near future matching the monitoring programme requirements for the Baltic.

Keywords:
pH, carbon system, monitoring, ocean acidification, ecosystem

Partners: Germany
, Poland, Sweden

Introductory article:
see page 9 of BONUS in Brief May 2014

For more information visit the BONUS projects' website.