BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//CERN//INDICO//EN
BEGIN:VEVENT
SUMMARY:Development of an in-situ sensor for autonomous\, high-resolution 
 tracing of ammonia levels in marine waters
DTSTART:20260617T111500Z
DTEND:20260617T123000Z
DTSTAMP:20260605T230100Z
UID:indico-event-1106@events.geomar.de
CONTACT:office-fb2@geomar.de\;-4445
DESCRIPTION:Speakers: Niklas Helle (AG Achterberg)\n\nAbstractAmmonium is 
 a key component of the marine nitrogen cycle and an important indicator of
  water quality and ecosystem dynamics. Accurate quantification in marine e
 nvironments remains challenging due to rapid biological and chemical trans
 formations influenced by temperature\, pH\, and microbial activity. Conven
 tional sampling followed by laboratory analysis is prone to errors\, as am
 monium concentrations can change significantly during storage and handling
 . In addition\, variations in salinity and matrix composition further comp
 romise measurement accuracy and precision. Existing in-situ approaches onl
 y partially address these limitations. Ion-selective electrodes offer fast
  response times but suffer from interferences in seawater and limited long
 -term stability. Flow-based systems using the indophenol blue method are c
 urrently the most advanced\, providing automation and sensitivity\, but th
 ey rely on toxic reagents and relatively high consumption of those.I will 
 present a novel in-situ sensor based on the o-phthalaldehyde (OPA) fluorom
 etric method\, show how this chemistry has been optimized and demonstrate 
 its implementation into a miniaturized\, flow-based system to enable accur
 ate\, high-resolution and environmentally safer ammonium measurements dire
 ctly in the marine environment.\nMeeting-Linkhttps://geomar.webex.com/geom
 ar/j.php?MTID=m4f250602f223e560bcd3e29bf91b6152\n \n\nhttps://events.geom
 ar.de/event/1106/
LOCATION:5-1.213 - PAZIFIK / PACIFIC- Rechte Seite - Großer\, unterteilba
 rer Konferenzraum (GEOMAR - Standort Ostufer  / GEOMAR - East Shore)
URL:https://events.geomar.de/event/1106/
END:VEVENT
END:VCALENDAR