title: A Multi-Pumping Flow System for In Situ Measurements of Dissolved Manganese in Aquatic Systems.
abstract: A METals In Situ analyzer (METIS) has been used to determine dissolved manganese (II) concentrations in the subhalocline waters of the Gotland Deep (central Baltic Sea). High-resolution in situ measurements of total dissolved Mn were obtained in near real-time by spectrophotometry using 1-(2-pyridylazo)-2-naphthol (PAN). PAN is a complexing agent of dissolved Mn and forms a wine-red complex with a maximum absorbance at a wavelength of 562 nm. Results are presented together with ancillary temperature, salinity, and dissolved O 2 data. Lab calibration of the analyzer was performed in a pressure testing tank. A detection limit of 77 nM was obtained. For validation purposes, discrete water samples were taken by using a pump-CTD system. Dissolved Mn in these samples was determined by an independent laboratory based method (inductively coupled plasma-optical emission spectrometry, ICP-OES). Mn measurements from both METIS and ICP-OES analysis were in good agreement. The results showed that the in situ analysis of dissolved Mn is a powerful technique reducing dependencies on heavy and expensive equipment (pump-CTD system, ICP-OES) and is also cost and time effective.
authors.affiliation: Leibniz Institute for Baltic Sea Research Warnemünde, Seestr. 15, 18119 Rostock, Germany. david.meyer@io-warnemuende.de.
authors.forename: David
authors.initials: D
authors.lastname: Meyer
authors.affiliation: Leibniz Institute for Baltic Sea Research Warnemünde, Seestr. 15, 18119 Rostock, Germany. ralf.prien@io-warnemuende.de.
authors.forename: Ralf D
authors.initials: RD
authors.lastname: Prien
authors.affiliation: Leibniz Institute for Baltic Sea Research Warnemünde, Seestr. 15, 18119 Rostock, Germany. olaf.dellwig@io-warnemuende.de.
authors.forename: Olaf
authors.initials: O
authors.lastname: Dellwig
authors.affiliation: Leibniz Institute for Baltic Sea Research Warnemünde, Seestr. 15, 18119 Rostock, Germany. joanna.waniek@io-warnemuende.de.
authors.forename: Joanna J
authors.initials: JJ
authors.lastname: Waniek
authors.affiliation: Leibniz Institute for Baltic Sea Research Warnemünde, Seestr. 15, 18119 Rostock, Germany. ingo.schuffenhauer@io-warnemuende.de.
authors.forename: Ingo
authors.initials: I
authors.lastname: Schuffenhauer
authors.affiliation: Leibniz Institute for Baltic Sea Research Warnemünde, Seestr. 15, 18119 Rostock, Germany. jan.donath@io-warnemuende.de.
authors.forename: Jan
authors.initials: J
authors.lastname: Donath
authors.affiliation: Leibniz Institute for Baltic Sea Research Warnemünde, Seestr. 15, 18119 Rostock, Germany. siegfried.krueger@io-warnemuende.de.
authors.forename: Siegfried
authors.initials: S
authors.lastname: Krüger
authors.affiliation: Leibniz Institute for Baltic Sea Research Warnemünde, Seestr. 15, 18119 Rostock, Germany. malte.pallentin@io-warnemuende.de.
authors.forename: Malte
authors.initials: M
authors.lastname: Pallentin
authors.affiliation: Leibniz Institute for Baltic Sea Research Warnemünde, Seestr. 15, 18119 Rostock, Germany. detlef.schulz-bull@io-warnemuende.de.
authors.forename: Detlef E
authors.initials: DE
authors.lastname: Schulz-Bull
keywords: Baltic Sea; in situ; manganese; multi-pumping flow system; redoxcline; sea water