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Sensors 2016, 16(12), 2027; doi:10.3390/s16122027

A Multi-Pumping Flow System for In Situ Measurements of Dissolved Manganese in Aquatic Systems

Leibniz Institute for Baltic Sea Research Warnemünde, Seestr. 15, 18119 Rostock, Germany
Author to whom correspondence should be addressed.
Academic Editors: Jong Seung Kim and Min Hee Lee
Received: 22 September 2016 / Revised: 21 November 2016 / Accepted: 23 November 2016 / Published: 30 November 2016
(This article belongs to the Special Issue Colorimetric and Fluorescent Sensor)
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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. View Full-Text
Keywords: manganese; in situ; multi-pumping flow system; sea water; redoxcline; Baltic Sea manganese; in situ; multi-pumping flow system; sea water; redoxcline; Baltic Sea

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Meyer, D.; Prien, R.D.; Dellwig, O.; Waniek, J.J.; Schuffenhauer, I.; Donath, J.; Krüger, S.; Pallentin, M.; Schulz-Bull, D.E. A Multi-Pumping Flow System for In Situ Measurements of Dissolved Manganese in Aquatic Systems. Sensors 2016, 16, 2027.

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